RU2687954C1 - Method of extended transmission of random access physical channel, network device and terminal - Google Patents

Abstract

FIELD: electrical communication engineering.SUBSTANCE: invention relates to communication technologies and is intended for extended transmission of a physical random access channel. Invention discloses terminal, which includes: a level determination unit configured to determine extended transmission information of the random access physical channel PRACH; a parameter determination unit configured to determine a first characteristic parameter which relates to PRACH extended transmission and which is associated with PRACH extended transmission layer information, which is determined by the level determining unit, wherein the first characteristic parameter includes at least one of transmitted power, preamble format and time-frequency resource; and a sending unit configured to perform extended PRACH transmission according to the first characteristic parameter determined by the parameter determination unit. In the above hardware solution, the first characteristic parameter is associated with level information, and the characteristic parameter used for the extended PRACH sending can be quickly and accurately determined, which reduces the terminal power.EFFECT: method for extended transmission of a physical channel random access, a network device and a terminal are proposed.14 cl, 19 dwg, 1 tbl

Description

TECHNICAL FIELD TO WHICH INVENTION RELATES.

[0001] The present invention relates to the field of communication technologies and, in particular, to an enhanced transfer method of a physical random access channel, a network device and a terminal.

BACKGROUND

[0002] A resource in LTE (Long Term Evolution, Long Term Evolution) or LTE-A (LTE Advanced, Long Term Evolution Advanced) system is subdivided into a radio frame (system frame) with respect to time, where one radio frame includes 10 subframes, the length of one the subframe is 1 ms, and one subframe includes two time slots; and is subdivided into subcarrier in terms of frequency. A PRB (Physical Resource Block, physical resource block) is defined as a time slot with respect to time and 12 subcarriers with respect to frequency.

[0003] In a radio communication system, a UE (User Equipment, user equipment / terminal) must establish a connection to the network, and this process is generally referred to as a random access process. In an LTE or LTE-A system, a random access process is divided into two types: a contested random access process and a non-ad hoc random access process. The adversary random access process includes four steps: step 1. The UE sends a random access preamble (abbreviated preamble) to the base station. Step 2. The base station returns a random access response to the terminal. Stage 3. Message 3 (Msg 3). Step 4. Post a contention message (Msg 4). The ad hoc random access process involves only the first two steps.

[0004] In an LTE or LTE-A network with extended coverage, extended transmission needs to be made on the PRACH (Physical Random Access Channel, physical random access channel), and the extended PRACH transmission means re-sending the random access preamble in the random access process according to the existing preamble format. When coverage of an existing LTE / LTE-A network requires extending coverage by additional x dB (for example, x = 15 or 20), in fact, since the distances between different UEs and base stations are different, the channel media between different UEs and base stations are different, and the losses in the path between the UE and the base station are also different, the required value of the system coverage expansion may be a value in the range 0 - x dB for different UEs. For the implementation of establishing a connection between different UEs and a network, the number of repetitions required by the UE to send a preamble is also different.

[0005] Currently, the following solution has been proposed for implementing the extended PRACH transmission: there are multiple repeat levels of the extended PRACH transmission for re-sending the preamble, for example, levels 1, 2 and 3 repeating the extended PRACH transmission. The number of repetitions for sending a preamble from the UE at each repetition level is pre-specified by the system or signaled. At different repetition levels of the extended PRACH transmission, the number of repetitions for sending a preamble with a UE is different. As the required expansion of the system coverage increases, the path loss between the UE and the base station also increases, the repetition level that belongs to the extended PRACH transmission and that is used by the UE to successfully complete the random access process also increases, and the number of repetitions to send preamble is increasing. At each repetition level, the UE resends the random access preamble according to the repetition number for the repetition level.

[0006] For each level of repetition of the extended PRACH transmission, the set of resources of the extended PRACH transmission is indicated in advance by the system or signaled. The PRACH extended transmission resource set includes one or more PRACH extended transmission resources. The resources of the extended PRACH transmission include a code resource (preamble), a time resource and a frequency resource, which are used to send the preamble. The time resource and the frequency resource may be collectively referred to as a time-frequency resource. During the extended PRACH transmission, the UE sends the preamble using one repetition level of the extended PRACH transmission, and re-sends, according to the repetition number for the repetition level and according to the existing preamble format, the preamble on the resource that is included in resources for level of repetition.

[0007] For an extended PRACH transmission, the time resource and / or frequency resource included in the PRACH extended transmission resource set may be identical to the time resource and / or frequency resource for PRACH transmission (PRACH transmission that does not need expansion, and the preamble is sent according to the existing without repeating). In the extended PRACH transmission and PRACH transmission, resource multiplexing is performed in CDM (code division multiplexing) mode, i.e., the PRACH extended transmission resource set and the PRACH transmission resource set include various code resources (preambles). The time resource and / or frequency resource included in the PRACH extended transmission resource set may also be re-defined and different from the time resource and / or frequency resource of the PRACH transmission.

[0008] At each repetition level of the extended PRACH transmission, the re-sending of the preamble by the UE according to the repetition number for the repetition level is indicated as one attempt to send the preamble. If the UE does not receive the RAR after completing a single preamble sending attempt at the PRACH extended transmission repeat level (not the highest PRACH extended retry level), the UE increases the repeat level of the extended PRACH transmission by one level and attempts to resend the preamble according to the number of repetitions for the increased level repetition of the extended PRACH transmission.

[0009] Transmit Power P_PRACH to send a random access preamble with a UE, it is obtained according to the following formula: P_PRACH= min {P _{CMAX, c}(i), PREAMBLE_RECEIVED_TARGET_POWER +PL _c } _ [dBm], where min {} indicates an operation to calculate the minimum value,P _{CMAX, c}(i) - the maximum value of the transmitted power of the UE in the subframe numberi,PL _c  - The value of the loss in the chain of preamble power, DELTA_PREAMBLE — power offset value associated with the preamble format, powerRampingStep — ramp voltage power adjustment step, and PREAMBLE_TRANSMISSION_COUNTER — number of preamble transmissions.

[0010] In the above PRACH extended transmission method, if the transmitted power is determined in the power calculation mode for each attempt to send a preamble by the UE, there is a problem of the power loss of the UE.

SUMMARY OF INVENTION

[0011] Embodiments of the present invention provide a method for an enhanced transmission of a physical random access channel, a network device, and a terminal, which are used to reduce the power of the terminal.

[0012] The first aspect of embodiments of the present invention provides a terminal including:

a level determination unit configured to determine the level information of the extended transmission of the physical random access channel PRACH;

a parameter determination unit configured to determine a first characteristic parameter that relates to the extended PRACH transmission and that is associated with the PRACH advanced transmission level information, which is determined by the level determination unit, the first characteristic parameter including at least one of the transmitted power , the format of the preamble and time-frequency resource; and

a sending unit configured to perform the extended sending of the PRACH according to the first characteristic parameter determined by the parameter determining unit.

[0013] According to the decision to implement the first aspect, in the first possible embodiment, the first characteristic parameter includes the transmitted power; and

the parameter determination unit is configured to determine the transmit power of the PRACH extended transmission according to the second characteristic parameter corresponding to the information of the PRACH extended transmission level, the second characteristic parameter being at least one of the initial received target preamble power, the number of preamble transmission attempts , path loss threshold, ramp voltage adjustment, power offset values associated with format m preamble and the value of power offset associated with the information transfer level extended PRACH.

[0014] According to the first possible solution for implementing the first aspect, in the second possible embodiment, the parameter determining unit is configured to determine the transmit power of the extended PRACH transmission according to the second characteristic parameter corresponding to the information of the extended PRACH transmission level, and the second second characteristic parameters corresponding to different information of the advanced transmission level PRACH, are completely identical, or partially identical, or completely different.

[0015] According to the first possible solution for implementing the first aspect, in the third possible embodiment, the parameter determining unit is configured to determine, according to the third characteristic parameter, the corresponding level information that relates to the extended PRACH transmission and which is one level lower than the extended level information PRACH transmission, and at least one parameter included in the second characteristic parameter corresponds to the level information of the extended PRACH transmission, and rety characteristic parameter is at least one of the initial received target power of the preamble, the power control step, a linearly changing voltage, a fixed value of power offset and maximum number of preamble transmission attempts.

[0016] According to a third possible solution for implementing the first aspect, in a fourth possible embodiment, the second characteristic parameter includes the initial received target preamble power; and

the parameter determination unit is configured to: if the PRACH extended transmission level information is not the first PRACH extended transmission level, determine that: the initial received target preamble power corresponding to the information of the PRACH extended transmission level is equal to the sum of the initial received target preamble power and the linear power control step varying voltages that correspond to the level information that relates to the extended PRACH transmission, and which is one level lower than the level information The extended PRACH transmission, or the initial received preamble target power corresponding to the PRACH extended transmission level information, is a fixed value of the power offset plus the sum of the initial received preamble target power and the power control step with linearly varying voltage, which correspond to the level information related to the extended PRACH transmission, and which is one level lower than the level information of the extended PRACH transmission; or

if the information of the PRACH extended transmission level is the first level of the PRACH extended transmission, determine that: the initial received target preamble power corresponding to the information of the extended PRACH transmission level is the initial received preamble target power configured by the network device or the initial received preamble target power corresponding to the information PRACH extended transmission level is equal to the sum of the initial received target power of the preamble and the step of adjusting the power of the linearly varying voltage that correspond to the transmission PRACH, the initial or accepted target preamble power corresponding to the transmission level information extended PRACH, a fixed power offset value plus the sum of the received preamble initial target power and the power control step of linearly changing voltage which correspond to the transmission PRACH.

[0017] According to a third possible solution for implementing the first aspect, in the fifth possible embodiment, the second characteristic parameter includes the number of attempts to transmit the preamble; and

the parameter determining unit is configured to: set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the level information that relates to the extended PRACH transmission and which is one level lower than PRACH extended transmission level information; or set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1; or set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the PRACH transmission.

[0018] According to the first possible solution for implementing the first aspect, in the sixth possible embodiment, the second characteristic parameter includes path loss or threshold path loss; and

the parameter determination unit is configured to: set path loss corresponding to the information of the PRACH extended transmission level equal to the lowest path loss to determine the information of the PRACH extended transmission level; or set the path loss threshold corresponding to the information of the PRACH extended transmission level equal to the smallest path loss threshold to determine the information of the PRACH extended transmission level.

[0019] According to the first possible solution for implementing the first aspect, in the seventh possible implementation, the second characteristic parameter includes a power offset value associated with the information of the extended PRACH transmission level; and

the parameter determining unit is configured to: set the power offset value associated with the PRACH extended transmission level information equal to the difference between the largest path loss or threshold path loss to determine the PRACH extended transmission level information and path loss estimated by the UE; or set the power offset value associated with the PRACH extended transmission level information equal to the difference between the sum of the smallest path loss or threshold path loss to determine the first PRACH extended transmission level and the product obtained by multiplying the PRACH extended transmission level information , to determine the level information of the extended PRACH transmission, and path loss estimated by the UE.

[0020] According to the first, second, third, fourth, fifth, sixth or seventh possible solution for implementing the first aspect, in the eighth possible embodiment, the parameter determining unit is further configured to: if the information of the extended PRACH transmission level is not the highest information of the advanced PRACH transmission level when the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level is equal to the sum of the difference between the initial value of the number of transmission attempts of the preamble ambuli corresponding to the information of the PRACH extended transmission level, and 1, and the number of available preamble transmission attempts corresponding to the information of the PRACH extended transmission level, increase the information of the advanced PRACH transmission level by one level; or if the PRACH extended transmission level information is not the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information on one level; or if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the sum of the difference between the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level information, and 1, and the number of available attempts to transmit the preamble, the corresponding information of the PRACH extended transmission level, to carry out the operation of postponing the transmission and attempt to retransmit the preamble starting with the lowest information of the PRACH extended transmission level, or perform a postpone operation and attempt to retransmit the preamble, storing the PRACH extended transmission level information as the highest information of the PRACH advanced transmission level, or Notify a higher level of unsuccessful extended random access attempts or if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level, when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the number of available preamble transmission attempts corresponding to the PRACH advanced transmission level information, perform a postponing operation and attempt re-send the preamble starting at the lowest information level of the extended PRACH transmission, or perform a postpone operation I transmit and try to retransmit the preamble, saving the PRACH extended transmission level information as the highest PRACH advanced transfer level information, or adjust the delay parameter of the transmission, or notify a higher level of an unsuccessful extended random access attempt.

[0021] According to the eighth possible solution for implementing the first aspect, in the ninth possible embodiment, the parameter determining unit is further configured to determine that: the quantities that are related to the available attempts of the preamble transmission and that correspond to all the information of the PRACH extended transmission level are the same, or the quantities which are related to the available preamble transmission attempts and which correspond to at least two different levels of the extended PRACH transmission, are different.

[0022] According to the eighth possible solution for implementing the first aspect, in the tenth possible embodiment, the parameter determining unit is configured to determine that: the number of available preamble transmission attempts corresponding to the information of the PRACH extended transmission level is configured by the network device, or the number of available preamble transmission attempts corresponding to information of the level of the extended PRACH transmission, is predefined, or the number of available attempts to transmit the preamble corresponding to the information The level of the extended PRACH transmission is determined according to a predefined rule.

[0023] According to the decision to implement the first aspect, in the eleventh possible embodiment, if the first characteristic parameter includes the transmitted power,

the parameter determination unit is configured to: if the information of the PRACH extended transmission level is the nth extended PRACH transmission level, determine that: the transmitted power of the extended PRACH transmission is the maximum transmit power of the UE, or the transmitted power of the extended PRACH transmission is the value of the allocated information power PRACH extended transmission level, where n is a positive integer.

[0024] According to the eleventh possible solution for implementing the first aspect, in the twelfth possible embodiment, the parameter determining unit is configured to: determine the value of the allocated power of the PRACH extended transmission level information according to a predetermined value; or determine the value of the allocated power of the PRACH extended transmission level information according to the configuration implemented by the network device.

[0025] According to the eleventh or twelfth possible solution for implementing the first aspect, in the thirteenth possible embodiment, the parameter determining unit is configured to determine that the values of the allocated power of at least two different levels of the extended PRACH transmission are different .

[0026] According to the decision to implement the first aspect, in the fourteenth possible embodiment, if the first characteristic parameter includes a preamble format,

the parameter determining unit is configured to determine that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two different levels of the PRACH extended transmission are different.

[0027] According to the fourteenth possible solution for implementing the first aspect, in the fifteenth possible embodiment, the parameter determining unit is configured to: in the process of determining that the preamble formats associated with at least two different levels of the extended PRACH transmission are different if there are N levels PRACH extended transmission, determine that: the first N1 of the extended PRACH transmission in N levels of the extended PRACH transmission are associated with the first preamble format, and the subsequent N-N1 extended PRACH transmission in N PRACH extended transmission levels are associated with a second preamble format, where N and N1 are positive integers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0028] According to the fifteenth possible solution for implementing the first aspect, in the sixteenth possible embodiment, the parameter determining unit is configured to determine that the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0029] According to the decision to implement the first aspect, in the seventeenth possible embodiment, the parameter determining unit is configured to determine that the preamble format 4 is not used for the extended PRACH transmission.

[0030] According to the fourteenth, fifteenth, sixteenth or seventeenth possible solution for the implementation of the first aspect, in the eighteenth possible implementation, the parameter determination unit is configured to determine that: the preamble format used, associated with certain information of the PRACH extended transmission level, is preset or associated with the determined information of the advanced PRACH transmission level is configured by the network device.

[0031] According to the decision to implement the first aspect, in the nineteenth possible embodiment, the first characteristic parameter includes a time-frequency resource; and

the parameter determining unit is configured to: determine that the time-frequency resources associated with the first M1 levels of the extended PRACH transmission in the M neighboring levels of the extended PRACH transmission include a first time-frequency resource; and determine that the time-frequency resources associated with the subsequent M-M1 extended PRACH transmission levels in the M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0032] A second aspect of embodiments of the present invention provides a method for an enhanced transmission of a physical random access channel, including:

determining the information level of the extended transmission of the physical random access channel PRACH;

determining a first characteristic parameter that relates to the PRACH extended transmission and which is associated with the information of the PRACH extended transmission level, the first characteristic parameter including at least one of the transmitted power, the preamble format, and the time-frequency resource; and

implementation of the extended send PRACH according to the first characteristic parameter.

[0033] According to the decision to implement the second aspect, in the first possible embodiment, if the first characteristic parameter includes the transmitted power, the determination of the first characteristic parameter that relates to the extended PRACH transmission and which is associated with the information of the extended PRACH transmission level includes

determining the transmitted power of the extended PRACH transmission according to the second characteristic parameter corresponding to the information of the PRACH extended transmission level information, the second characteristic parameter being at least one of the initial received target power of the preamble, the number of preamble transmission attempts, path loss, threshold path loss, the step of adjusting the power of a linearly varying voltage, the power offset values associated with the preamble format, and the power offset values associated information transfer level extended PRACH.

[0034] According to the first possible solution for implementing the second aspect, in the second possible embodiment, the second characteristic parameters corresponding to different information of the PRACH extended transmission level are completely identical, or partially identical, or completely different.

[0035] According to the first possible solution for the implementation of the second aspect, in the third possible implementation variant, the fact that at least one parameter included in the second characteristic parameter corresponds to the level information of the extended PRACH transmission is determined according to the third characteristic parameter corresponding to the level information, which relates to the extended PRACH transmission, and which is one level lower than the information of the PRACH extended transmission level, the third characteristic parameter being, n at least one of the initial received target power of the preamble, the step of adjusting the power with a linearly varying voltage, a fixed value of the power offset and the maximum number of attempts to transmit the preamble.

[0036] According to a third possible solution for implementing the second aspect, in a fourth possible embodiment, the second characteristic parameter includes the initial received target power of the preamble, and the method for determining the second characteristic parameter corresponding to the information of the advanced PRACH transmission level includes:

if the information of the PRACH extended transmission level is not the first PRACH extended transmission level, determining that: the initial received target power of the preamble corresponding to the information of the advanced PRACH transmission level is equal to the sum of the initial received target power of the preamble and the power control step by linearly varying voltage which relates to the extended PRACH transmission, and which is one level lower than the information from the PRACH extended transmission level, or the initial accepted target The new preamble power corresponding to the PRACH extended transmission level information is a fixed value of the power offset plus the sum of the initial received target preamble power and the power control step by ramp voltage, which correspond to the level information that relates to the extended PRACH transmission, and which is one level lower, what is the level information of the extended PRACH transmission; or

if the PRACH extended transmission level information is the first PRACH extended transmission level, determining that: the initial received target preamble power corresponding to the information of the extended PRACH transmission level is the initial received preamble target power configured by the network device or the initial received preamble target power corresponding to the information PRACH extended transmission level is equal to the sum of the initial received target power of the preamble and the step of adjusting the power of the linearly changing I voltage, which correspond to the transmission PRACH, the initial or accepted target preamble power corresponding to the transmission level information extended PRACH, a fixed power offset value plus the sum of the received preamble initial target power and the power control step of linearly changing voltage which correspond to the transmission PRACH.

[0037] According to a third possible solution for implementing the second aspect, in the fifth possible embodiment, the second characteristic parameter includes the number of attempts to transmit the preamble, and the method for determining the second characteristic parameter corresponding to the information of the PRACH extended transmission level includes:

setting the initial value of the number of preamble transmission attempts corresponding to the PRACH extended transmission level information equal to 1 plus the maximum number of preamble transmission attempts corresponding to the level information related to the extended PRACH transmission and one level lower than the PRACH extended transmission level information; or setting the initial value of the number of attempts to transmit a preamble corresponding to the information of the PRACH extended transmission level equal to 1; or setting the initial number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the PRACH transmission.

[0038] According to the first possible solution for implementing the second aspect, in the sixth possible embodiment, if the second characteristic parameter includes path loss or threshold path loss, the method for determining the second characteristic parameter corresponding to the information of the advanced PRACH transmission level includes:

establishing path loss corresponding to the information of the PRACH extended transmission level equal to the lowest path loss to determine the information of the PRACH extended transmission level; or establishing a path loss threshold corresponding to the information of the PRACH extended transmission level equal to the lowest path threshold threshold for determining the PRACH extended transmission level information.

[0039] According to the first possible solution for implementing the second aspect, in the seventh possible implementation, the second characteristic parameter includes a power offset value associated with the information of the extended PRACH transmission level, and a method for determining the second characteristic parameter corresponding to the information of the advanced PRACH transmission level :

determining a power offset value associated with the PRACH extended transmission level information equal to the difference between the largest path loss or threshold path loss to determine the information of the extended PRACH transmission level and path loss estimated by the UE; or

setting a power offset value associated with the PRACH extended transmission level information equal to the difference between the sum of the least path loss or threshold path loss to determine the first PRACH extended transmission level and the product obtained by multiplying the PRACH extended transmission level information by the path loss step, to determine the level information of the extended PRACH transmission, and path loss estimated by the UE terminal.

[0040] According to the first, second, third, fourth, fifth, sixth or seventh possible solution for implementing the second aspect, in the eighth possible embodiment, the method further includes:

if the information of the PRACH extended transmission level is not the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the sum of the difference between the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level information, and 1, and the number of available preamble transmission attempts, the corresponding information of the PRACH extended transmission level, an increase in the information of the advanced transmission level P Rach one level; or

if the PRACH extended transmission level information is not the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information one level; or

if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the sum of the difference between the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level information, and the number of available attempts to transmit the preamble, the corresponding information of the PRACH extended transmission level, the execution of the postponing operation and attempt to resend the preamble, starting with the lowest information of the PRACH extended transmission level, or perform a postpone operation and attempt to resend the preamble while maintaining the PRACH extended transmission level information as the highest information of the PRACH extended transmission level, or adjusting the delay parameter of the transmission, or notification of a higher level of an unsuccessful extended random access attempt; or

if the information of the extended PRACH transmission is the highest information of the extended PRACH transmission, when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the number of available preamble transmission attempts corresponding to the information of the advanced PRACH transmission level, carry out the postponing operation and retry sending the preamble, starting with the lowest level information of the extended PRACH transmission, or performing a postpone operation transmission and implementation attempts to resend the preamble while maintaining the level information extended PRACH transmission information as the highest level extended PRACH transmission, or delaying transmission parameter adjustment or alerted by UE, a higher level of an unsuccessful attempt extended random access.

[0041] According to the eighth possible solution for the implementation of the second aspect, in the ninth possible implementation, the quantities that relate to the available preamble transmission attempts and which correspond to all the information of the PRACH extended transmission level are the same, or the quantities that correspond to the available preamble transmission attempts, at least two different levels of the extended PRACH transmission are different.

[0042] According to the eighth possible solution for implementing the second aspect, in the tenth possible embodiment, the number of available preamble transmission attempts corresponding to the information of the extended PRACH transmission level is configured by the network device, or the number of available preamble transmission attempts corresponding to the information of the advanced PRACH transmission level is set, or the number of available preamble transmission attempts corresponding to the information of the PRACH extended transmission level is determined according to a predetermined from the rule.

[0043] According to the decision to implement the second aspect, in the eleventh possible embodiment, if the first characteristic parameter includes the transmit power, the determination of the first characteristic parameter, which relates to the extended PRACH transmission and which is associated with the information of the extended PRACH transmission level, includes:

if the information of the extended PRACH transmission level is the nth extended PRACH transmission level, determining that: the transmitted transmission power of the extended PRACH transmission is the maximum transmit power value of the UE, or the transmitted transmission power of the extended PRACH transmission is the value of the allocated power of the PRACH extended transmission information, where n - positive integer.

[0044] According to the eleventh possible solution for implementing the second aspect, in the twelfth possible embodiment, the value of the allocated power of the PRACH extended transmission level information is predetermined; or the value of the allocated power of the PRACH extended transmission level information is configured by the network device.

[0045] According to the eleventh or twelfth possible solution for the implementation of the second aspect, in the thirteenth possible embodiment, the values of the allocated power of at least two different levels of the extended PRACH transmission are different.

[0046] According to the decision to implement the second aspect, in the fourteenth possible embodiment, if the first characteristic parameter includes the preamble format, the definition of the first characteristic parameter that relates to the extended PRACH transmission and which is associated with the information of the advanced PRACH transmission level includes

determining that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two different PRACH extended transmission levels are different.

[0047] According to the fourteenth possible solution for the implementation of the second aspect, in the fifteenth possible embodiment, the determination that the preamble formats associated with at least two different levels of the PRACH extended transmission are different include:

if there are N PRACH extended transmission levels, the first N1 extended PRACH transmission levels in N PRACH extended transmission levels are associated with the first preamble format, and the subsequent N-N1 extended PRACH transmission levels in N PRACH advanced transmission levels are associated with the second preamble format, where N and N1 are positive integers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0048] According to the fifteenth possible solution for implementing the second aspect, in the sixteenth possible embodiment, the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0049] According to the decision to implement the second aspect, in the seventeenth possible embodiment, preamble format 4 is not used for the extended PRACH transmission.

[0050] According to the fourteenth, fifteenth, sixteenth or seventeenth possible solution for the implementation of the second aspect, in the eighteenth possible implementation, the preamble format associated with certain information of the advanced PRACH transmission level is predefined, or the preamble format associated with the specific information of the advanced PRACH transmission information is network device.

[0051] According to the decision to implement the second aspect, in the nineteenth possible embodiment, if the first characteristic parameter includes a time-frequency resource, the determination of the first characteristic parameter, which relates to the extended PRACH transmission and which is associated with the information of the extended PRACH transmission level, includes:

determining that time-frequency resources associated with the first M1 levels of the extended PRACH transmission in the M neighboring levels of the extended PRACH transmission include a first time-frequency resource; and determining that time-frequency resources associated with subsequent M-M1 extended PRACH transmission levels at M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0052] The third aspect of the embodiments of the present invention provides for a network device including:

a parameter determining unit configured to determine a first characteristic parameter that relates to the extended PRACH transmission and that is associated with the information of the extended transmission level of the physical random access channel PRACH, the first characteristic parameter including at least one of the preamble format and -frequency resource; and

a reception unit configured to perform the extended reception of the PRACH according to the first characteristic parameter, which is associated with all the information of the advanced PRACH transmission level and which is determined by the parameter determination unit.

[0053] According to the decision to implement the third aspect, in the first possible embodiment, the network device further includes:

a sending unit, configured to: before the receiving unit performs an extended reception of the PRACH according to the first characteristic parameter associated with all the information of the extended PRACH transmission level, send to the UE at least one of the following configuration information: initial received target power the preamble, the number of available attempts to transmit the preamble, the corresponding information of the PRACH extended transmission level, and the value of the allocated power of the PRACH extended transmission information, which allows the UE determine, according to the configuration information, the transmitted power that relates to the extended PRACH transmission, which is associated with the PRACH extended transmission level information, or increase the PRACH advanced transmission level information by one level, or carry out the postponing operation and try to resend the preamble, starting with the lowest level information of the extended PRACH transmission, or carry out the postpone operation of the transmission and attempt to resend the preamble while retaining the information PRACH extended transmission level as the highest information of the extended PRACH transmission level, or adjust the delay parameter of the transmission, or notify a higher level of an unsuccessful extended random access attempt.

[0054] According to the decision to implement the third aspect or the first possible embodiment of the third aspect, in the second possible embodiment, the parameter determining unit is further configured to determine that: quantities that are related to the available attempts of the preamble transmission and which correspond to all the information of the PRACH extended transmission level, the same, or quantities that are related to the available attempts to transmit the preamble and that correspond to at least two different levels of extended n soap has PRACH, different.

[0055] According to the decision to implement the third aspect or the first possible embodiment of the third aspect, in the third possible embodiment, the parameter determination unit is further configured to determine that the values of the allocated power of at least two different levels of the extended PRACH transmission in all the information of the advanced transmission level PRACH are different.

[0056] According to the third aspect implementation decision, in the fourth possible embodiment, if the first characteristic parameter includes a preamble format, the parameter definition unit is configured to determine that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two different levels of the extended PRACH transmission are different.

[0057] According to the fourth possible embodiment of the third aspect, in the fifth possible embodiment, the parameter determining unit is configured to: in the process of determining that the preamble formats associated with at least two different levels of the extended PRACH transmission are different if there are N levels of the extended PRACH transmissions, determine that: the first N1 of the extended PRACH transmission levels in N levels of the extended PRACH transmission are associated with the first preamble format, and the subsequent N-N1 extended PRACH transmission levels in N levels extension transmission associated with a second PRACH preamble format, where N and N1 - positive integers, N1 is less than N, and a first preamble format and a second format different preamble.

[0058] According to the fifth possible embodiment of the third aspect, in the sixth possible embodiment, the parameter determining unit is configured to determine that the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0059] According to the third aspect implementation decision, in the seventh possible embodiment, the parameter determining unit is configured to determine that the preamble format 4 is not used for the extended PRACH transmission.

[0060] According to the fourth, fifth, sixth or seventh possible solution for implementing the third aspect, in the eighth possible embodiment, the parameter determining unit is configured to determine that the preamble format associated with the determined information of the PRACH extended transmission level is predetermined; or the sending unit included in the network device is configured to send, to the UE, the preamble format configuration information associated with the determined information of the PRACH extended transmission level.

[0061] According to the decision to implement the third aspect, in the ninth possible embodiment, if the first characteristic parameter includes a time-frequency resource,

the parameter determining unit is configured to: determine that the time-frequency resources associated with the first M1 levels of the extended PRACH transmission in the M neighboring levels of the extended PRACH transmission include a first time-frequency resource; and determine that the time-frequency resources associated with the subsequent M-M1 extended PRACH transmission levels in the M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0062] The fourth aspect of the embodiments of the present invention provides a method for an enhanced transmission of a physical random access channel, including:

determining a first characteristic parameter that relates to the PRACH extended transmission and which is associated with the information of the extended transmission level of a physical random access channel PRACH, the first characteristic parameter including at least one of a preamble format and a time-frequency resource; and

the implementation of the extended reception of the PRACH according to the first characteristic parameter associated with all the information of the PRACH extended transmission level.

[0063] According to the decision to implement the fourth aspect, in the first possible embodiment, prior to the implementation of the extended reception of the PRACH according to the first characteristic parameter associated with all the information of the level of the extended transmission of the PRACH, the method includes:

sending, to the UE, at least one of the following configuration information: the initial received target target power, the number of available preamble transmission attempts, the corresponding information of the extended PRACH transmission level, and the allocated power values of the advanced PRACH transmission level information, which allows the UE to determine according to configuration information, transmitted power, which is related to the extended PRACH transmission and which is associated with the PRACH extended transmission level information, or PRACH broadcasts by one level, or carrying out a postponing operation and attempting to re-send the preamble, starting with the lowest information level of the extended PRACH transmission, or performing a postponing operation and attempting to re-sending the preamble while maintaining the PRACH extended transmission level information information of the level of the extended PRACH transmission, or adjustment of the parameter of the delay of transmission, or notification of a higher level of an unsuccessful attempt to expand random access.

[0064] According to the decision to implement the fourth aspect or the first possible embodiment of the fourth aspect, in the second possible embodiment, the quantities that relate to the available attempts to transmit the preamble and that correspond to all the information of the PRACH extended transmission level are the same, or the quantities that refer to the available transmission attempts the preambles and which correspond to at least two different levels of the extended PRACH transmission are different.

[0065] According to the decision to implement the fourth aspect or the first possible embodiment of the fourth aspect, in the third possible embodiment, the values of the allocated power of at least two different levels of the extended PRACH transmission are different.

[0066] According to the fourth aspect implementation decision, in the fourth possible embodiment, if the first characteristic parameter includes a preamble format, the definition of the first characteristic parameter, which relates to the extended PRACH transmission and which is associated with the information of the extended PRACH transmission level, includes:

determining that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two different PRACH extended transmission levels are different.

[0067] According to the fourth possible embodiment of the fourth aspect, in the fifth possible embodiment, the determination that the preamble formats associated with at least two levels of the PRACH extended transmission are different include:

if there are N PRACH extended transmission levels, the first N1 extended PRACH transmission levels in N PRACH extended transmission levels are associated with the first preamble format, and the subsequent N-N1 extended PRACH transmission levels in N PRACH advanced transmission levels are associated with the second preamble format, where N and N1 are positive integers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0068] According to the fifth possible embodiment of the fourth aspect, in the sixth possible embodiment, the first preamble format and the second preamble format are the preamble formats in preamble format 1 and the preamble format 3.

[0069] According to the fourth aspect implementation decision, in the seventh possible embodiment, the preamble format 4 is not used for the extended PRACH transmission.

[0070] According to the fourth, fifth, sixth or seventh possible solution for the implementation of the fourth aspect, in the eighth possible embodiment, the preamble format associated with the determined information of the PRACH extended transmission level is predetermined; or the preamble format configuration information associated with the determined information of the PRACH extended transmission level is sent to the UE.

[0071] According to the fourth aspect implementation decision, in the ninth possible embodiment, if the first characteristic parameter includes a time-frequency resource, the determination of the first characteristic parameter, which relates to the extended PRACH transmission and which is associated with the information of the extended PRACH transmission level, includes:

determining that time-frequency resources associated with the first M1 levels of the extended PRACH transmission in the M neighboring levels of the extended PRACH transmission include a first time-frequency resource; and determining that time-frequency resources associated with subsequent M-M1 extended PRACH transmission levels at M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0072] A fifth aspect of embodiments of the present invention provides a device configured as a receiving device for half-duplex frequency division duplex, including:

a control unit configured to: when the receiving device switches from the uplink subframe to the downlink subframe, control the receiving device to skip receiving data in the guard interval in the first part of the downlink subframe, or to skip sending data in the guard interval part of uplink subframe.

[0073] According to the decision to implement the fifth aspect, in the first possible embodiment, the control unit includes:

a guard interval determining unit, configured to determine a guard interval according to a time for adjusting an operating frequency by a frequency generator and / or a two-way propagation delay in the uplink and the downlink.

[0074] The sixth aspect of embodiments of the present invention provides for a network device including:

dispatch control unit configured to: control a network device to skip sending downlink data to a receiving half-duplex communication unit with frequency division in the first subframe preceding the uplink subframe and / or controlling the network device to skip sending downlink data On the receiving device of half duplex duplex communication with frequency division in the first subframe of the downlink, following the subframe of the ascending uu connection.

[0075] The seventh aspect of embodiments of the present invention provides a method for transmitting frame data, including:

when the receiving frequency division duplex half duplex device switches from an uplink subframe to a downlink subframe, receiving, by the receiving device, data in the guard interval in the first part of the downlink subframe, or skipping sending data in the guard interval in the last part of the subframe uplink

[0076] According to the decision to implement the seventh aspect, in the first possible embodiment,

the guard interval is determined using time to adjust the operating frequency by the frequency generator and / or the delay in two-way propagation on the uplink and downlink.

[0077] An eighth aspect of embodiments of the present invention provides a method for transmitting frame data, including:

skipping sending, by the network device, downlink data to the receiving half-duplex communication unit with frequency division in the first subframe preceding the uplink subframe, and / or sending skip, by the network device, downlink data to the receiving half duplex communication unit with frequency by splitting in the first downlink subframe next to the uplink subframe.

[0078] From the above technical solutions, it can be understood that embodiments of the present invention have the following advantages: the first characteristic parameter is associated with the level information, and the characteristic parameter used for the extended PRACH send can be quickly and accurately determined, which reduces the power of the terminal.

BRIEF DESCRIPTION OF THE DRAWINGS

[0079] For a more visual description of the technical solutions in the embodiments of the present invention, the accompanying drawings, which are necessary for the description of the embodiments, are briefly presented below. Obviously, the accompanying drawings in the following description demonstrate only some embodiments of the present invention, and a person skilled in the art can compose other drawings from these accompanying drawings without creative ability.

[0080] FIG. 1 is a simplified block diagram of a terminal according to an embodiment of the present invention;

[0081] FIG. 2 is a simplified flowchart of a random access method according to an embodiment of the present invention;

[0082] FIG. 3 is a simplified block diagram of a method on a terminal side according to an embodiment of the present invention;

[0083] FIG. 4 is a simplified block diagram of a network device according to an embodiment of the present invention;

[0084] FIG. 5 is a simplified block diagram of a network device according to an embodiment of the present invention;

[0085] FIG. 6 is a simplified flowchart of a method on a network device side according to an embodiment of the present invention;

[0086] FIG. 7 is a simplified block diagram of a terminal according to an embodiment of the present invention;

[0087] FIG. 8 is a simplified block diagram of a network device according to an embodiment of the present invention;

[0088] FIG. 9 is a simplified block diagram of a terminal according to an embodiment of the present invention;

[0089] FIG. 10 is a simplified block diagram of a network device according to an embodiment of the present invention;

[0090] FIG. 11 is a simplified block diagram of a frame in accordance with an embodiment of the present invention;

[0091] FIG. 12 is a simplified block diagram of a frame in accordance with an embodiment of the present invention;

[0092] FIG. 13 is a simplified block diagram of a device according to an embodiment of the present invention;

[0093] FIG. 14 is a simplified block diagram of an apparatus according to an embodiment of the present invention;

[0094] FIG. 15 is a simplified block diagram of a network device according to an embodiment of the present invention;

[0095] FIG. 16 is a simplified flowchart of a method according to an embodiment of the present invention;

[0096] FIG. 17 is a simplified flowchart of a method according to an embodiment of the present invention;

[0097] FIG. 18 is a simplified block diagram of an apparatus according to an embodiment of the present invention; and

[0098] FIG. 19 is a simplified block diagram of a network device according to an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

[0099] To clarify the tasks, technical solutions and advantages of the present invention, the present invention is described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part, and not all embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without the use of creative abilities shall be included in the protection scope of the present invention.

[0100] The problem of UE power loss, in particular, is expressed as follows:

[0101] (1) When the UE increases the repeat level of the extended PRACH transmission by one level and attempts to send the preamble according to the number of repetitions for the increased repeat level of the extended PRACH transmission, if the UE has already made several attempts to send the preamble to the original repeat level of the extended PRACH transmission, and adjusts the power with a linearly varying voltage in each attempt to send the preamble, that is, the transmitted power is increased by powerRampingStep (dB), and an arbitrary access is not completed after several attempts to send a preamble, UE increases the initial rate of repetition extended PRACH transmission on one level. Losses in the downlink pathPL _c evaluated on the UE at an increased level of repetition of the extended PRACH transmission are the same as those estimated at the initial repetition level, and if the initial value of PREAMBLE_TRANSMISSION_COUNTER in the first attempt to send a preamble is 1, the power of the first attempt to send a preamble is equal to the power of the first attempt to send a preamble performed at the original level repeating, and then adjusting the power with a linearly varying voltage is carried out in a subsequent attempt to send the preamble. The power of the first few attempts to send a preamble performed by the UE at an increased level of repetition of the extended PRACH transmission may not satisfy the requirement of a successful completion of the random access process, which leads to a loss of power of the first few attempts to send the preamble.

[0102] (2) In an LTE or LTE-A system with coverage expansion, when the channel environment in which the UE is located is relatively bad, there is a relatively large error in the losses in the downlink pathPL _c estimated at the UE, in this case also, there is an error in the transmitted power calculated by the UE, and if the power is relatively low, the UE does not need to attempt to send the preamble using relatively low power, or if the power is relatively high, the power to send the preamble is lost.

[0103] (3) If on the same time resource and the same frequency resource, the UE sends random access preambles at different repetition levels of the extended PRACH transmission, that is, resource multiplexing is performed on random access preambles at different PRACH extended repetition levels in the mode CDM, and if the random access preambles at the different repetition levels of the extended PRACH transmission use the same transmitted power, there is a near-far effect, i.e. a loss in the preamble path random access at different repetition levels of the extended PRACH transmission is different, the power attenuation values when preambles arrive at the base station are also different, and the preamble with higher path losses is masked by the preamble with low path losses, which leads to an attempt to retransmit the preamble.

[0104] An embodiment of the present invention provides a terminal configured to implement an enhanced PRACH physical transmission of a random access physical channel, wherein the enhanced transmission may be a retransmission, transmission in an extended spectrum, etc., and this embodiment of the present invention is described as an example using transfer. PRACH is the channel that carries the preamble; an extended PRACH transmission or a PRACH transmission may mean an extended transmission or transmission of a channel that carries a preamble, or may mean an extended transmission or transmission of a preamble; Transmission includes sending and receiving. As shown in FIG. 1, the terminal includes a level determining unit 101, a parameter determining unit 102, and a sending unit 103.

[0105] The level determining unit 101 is configured to determine the level information of the extended transmission of the physical random access channel PRACH.

[0106] In this embodiment of the present invention, the level information may be any of a level, level index, expansion level, expansion level index, repetition level, repetition level index, resource level, resource level index, resource set level, resource set level index, index resource set and resource index.

[0107] The parameter determination unit 102 is configured to determine a first characteristic parameter that relates to the extended PRACH transmission and which is associated with the information of the advanced PRACH transmission level, which is determined by the level determination unit 101.

[0108] In this embodiment of the present invention, the first characteristic parameter may be at least one of the transmitted power, the preamble format, and the time-frequency resource.

[0109] The sending unit 103 is configured to perform the extended sending of the PRACH according to the first characteristic parameter determined by the parameter determining unit 102.

[0110] This embodiment of the present invention is applied to an LTE or LTE-A system with enhanced coverage, and there are multiple repeat levels of an extended PRACH transmission, for example, levels 1, 2, and 3 of a repeat of an extended PRACH transmission. Index numbering can be performed at multiple levels of repetition, i.e., repetition level indices. In another mode, there are multiple levels or multiple expansion levels of the extended PRACH transmission, and the index is numbered at multiple levels, i.e. level indexes, or the index is numbered at multiple extension levels, i.e. extension level indexes. The PRACH extended transmission level information is any of a level, a level index, an extension level, an extension level index, a repetition level, and a repetition level index.

[0111] For each level of the extended PRACH transmission, the number of repetitions to send the preamble from the UE and the set of PRACH extended transmission resources that correspond to each level of the extended PRACH transmission are indicated by the system or signaled. The PRACH extended transmission resource set includes one or more PRACH extended transmission resources. The resources of the extended PRACH transmission include a code resource (preamble), a time resource and a frequency resource, which are used to send the preamble. The time resource and the frequency resource may be collectively referred to as a time-frequency resource. If the UE determines the information of the PRACH extended transmission level, the UE re-sends, according to the number of repetitions corresponding to the determined information of the PRACH extended transmission level, a preamble on a resource that belongs to the PRACH extended transmission and that is included in the PRACH extended transmission resource set. For different information of the level of the extended PRACH transmission, the number of repetitions for sending a preamble with a UE is different. Increasing the required value of system coverage expansion, path loss between the UE and the network device is also increased, the level information, which belongs to the extended PRACH transmission and is used by the UE to successfully complete the random access process, also increases, and the number of repetitions to send the preamble increases. Since there are multiple levels of the extended PRACH transmission, there are also multiple sets of resources of the extended PRACH transmission, and multiple sets of resources are used on the UE to send the preamble according to different repetition numbers. The PRACH resource set may be referred to as the PRACH extended transmission resource set level, and one or more PRACH extended transmission resources that are included in one PRACH extended transmission resource set may be collectively referred to as the PRACH extended transmission resource level, and the index numbering is separately resource set, resource set level, resource and resource level that are related to the PRACH extended transfer, i.e. resource set index, resource set level index, resource index and resource level index related to extended PRACH transmission. Information of the advanced PRACH transmission level may also be any of the resource level, resource level index, resource set level, resource set level index, resource set index and resource index. The index numbering is performed on the number of repetitions for sending the preamble from the UE, i.e. the index of the number of repetitions. The PRACH extended transmission level information may also be one of a repetition number and a repetition index.

[0112] Optionally, the information of the PRACH extended transmission level is determined according to the path loss between the network device and the UE. The base station or other network device presets the lowest path loss or threshold path loss and the greatest path loss or threshold path loss to determine the information of the extended PRACH transmission level, and the path loss between the network device and the UE are divided into X bands according to the smallest path loss or threshold path loss and the highest path loss or threshold path loss, and each path loss range corresponds to one level of the extended PRACH transmission, due to which, and The level information of the extended PRACH transmission is determined according to the lowest path loss or threshold path loss and the highest path loss or threshold path loss. For example, path losses or threshold path losses are predefined by x0, x1, and x2; path losses between a network device and a UE are divided into three ranges, and the first, second, and third (or 1st, 2nd, and 3rd) d) PRACH Extended Transmission Levels are defined as follows:

first level of extended PRACH transmission: x0 dB <path loss ≤ x1 dB;

second level of the extended PRACH transmission: x1 dB <path loss ≤ x2 dB; and

third level of extended PRACH transmission: path loss> x2.

[0113] For example, for the first level of an extended PRACH transmission, the smallest path loss or threshold path loss and the largest path loss or threshold path loss to determine the level information of the extended PRACH transmission are x0 and x1, respectively. The lowest path loss or threshold path loss and the greatest path loss or threshold path loss and / or X value can be predetermined or signaled by the network device to the UE. The index is numbered in the path loss range, that is, the path loss range index. Path loss can also be one of the required coverage expansion values, the received reference signal power, the received reference signal quality and channel quality information, and the index numbering is performed on the coverage expansion value, the received reference signal power, the reference signal quality and the quality information range. the channel, that is, the index of the coverage extension range, the index of the range of the received power of the reference signal, the index of the range of the received quality of the reference signal, and The index band channel quality information. The information of the PRACH extended transmission level can also be one of the coverage expansion value, the coverage expansion range index, the path loss index, the path loss range index, the received reference signal power, the received signal power range index of the reference signal, the received signal quality, the received range index reference signal quality, channel quality information, and channel quality information range index.

[0114] In this embodiment of the present invention, the level determining unit 101 may determine the level information of the extended PRACH transmission in several ways. The level determining unit 101 may also determine that the extended transmission is not to be performed on the PRACH, i.e., that the PRACH transmission is carried out when the preamble is sent according to the existing format without repetition. For example, the PRACH transmission level information and / or the PRACH extended transmission level information may be determined according to the path loss range between the UE and the network side or another measurement parameter or monitoring parameter, which may reflect the path loss range; or it is determined that the information of the PRACH extended transmission level is the first (lowest) level of the extended PRACH transmission; or it is determined that the information of the PRACH extended transmission level is level information obtained by increasing the initially determined information of the PRACH extended transmission level by one level of the PRACH extended transmission; or it is determined that the PRACH transmission is changed to the first level of the extended PRACH transmission. The specific mode for determining the PRACH extended transmission level information is not limited in this embodiment of the present invention.

[0115] In one mode, the determination of the PRACH transmission level information and / or the PRACH extended transmission information is as follows: a portion of the PRACH transmission level information and / or the PRACH extended transmission information is determined according to the path loss range between the UE and the network side or another measurement parameter or monitoring parameter reflect the range of path loss, and other information of the PRACH extended transmission level the UE determines by sequentially attempting from the PRACH transmission level information and / or from low racial level information transmission to high information level advanced transmission. If the attempt based on the PRACH transmission level information and / or the low information of the extended transmission level fails, the attempt is made based on a higher order of the advanced transmission level. For example, if the level information of the extended PRACH transmission includes the first, second, and third levels, the PRACH transmission is denoted as 0th level. If path loss ≤ x3 dB, it is determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the 0th PRACH transmission level; if path loss is> x4 dB, it is determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the third level of the PRACH extended transmission; if x3 dB <path loss ≤ x4 dB, it is first determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the 0th PRACH transmission level (or the first PRACH extended transmission level). In case of failure detection, it is determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the first level of the PRACH extended transmission attempt (or the second level of the PRACH extended transmission), etc.

[0116] In another mode, the determination of the level information of the PRACH transmission and / or the extended PRACH transmission is as follows: it is determined that the information of the PRACH extended transmission level is the first (lowest) level of the extended PRACH transmission. If the UE obtains the master information by receiving the enhanced master information block and / or acquires system information by receiving the enhanced system information block, the UE sends the preamble using the first level of the extended PRACH transmission. If the UE fails to perform random access by sending a preamble using the nth level of the extended PRACH transmission, the UE sends the preamble using the (n + 1) -th level of the extended PRACH transmission, where n is a positive integer. Extended main information block means a main information block that is re-sent in a radio frame several times. An extended system information block includes one or more of an expanded system information block of a type 1 system information block, an extended system information block of a system information block of type k, and an extended system information block of a system information block of type m, where k and m are positive integers, and, in particular, k = 2. An extended system information block of a system information block of type 1 means a system information block of a system information block of type 1 in subframe # 5 of an even-numbered radio frame and / or a block of system information that relates to a system information block of type 1 and which is resubmitted in another subframe. An extended system information block of a system information block of type k means a system information block that includes configuration information of an extended PRACH transmission. At least one type of configuration information in the configuration information included in the system information block of the system information block of type m is identical to the configuration information included in the system information block of the system information block of type 1.

[0117] In this embodiment of the present invention, the first characteristic parameter is associated with the level information, and the characteristic parameter used for the extended PRACH send can be quickly and accurately determined, which reduces the power of the terminal.

[0118] Based on three specific optional parameters included in the first characteristic parameter, this embodiment of the present invention provides the following four solutions, in particular the following:

[0119] 1. Optionally, the first characteristic parameter includes the transmitted power; and

the parameter determining unit 102 is configured to determine the transmitted power of the extended PRACH transmission according to the second characteristic parameter corresponding to the information of the advanced PRACH transmission level, the second characteristic parameter being at least one of the initial received target preamble power, the number of preamble transmission attempts, the path, the threshold losses in the path, the step of adjusting the power of the linearly varying voltage, the values of the power offset associated with the forms that the preamble and the value of power offset associated with the information transfer level extended PRACH.

[0120] Optionally, the parameter determining unit 102 is configured to determine the transmit power of the extended PRACH transmission according to the second characteristic parameter corresponding to the information of the extended PRACH transmission level, the second characteristic parameters corresponding to the different information of the advanced PRACH transmission level being identical or partially identical, or completely different.

[0121] Optionally, the parameter determination unit 102 is configured to determine, according to the third characteristic parameter, the corresponding level information that relates to the extended PRACH transmission and which is one level lower than the information of the PRACH extended transmission level, and at least one the parameter included in the second characteristic parameter corresponds to the information of the PRACH extended transmission level, the third characteristic parameter being at least one of the initial received preamble target power, ramp power adjustment steps, a fixed power offset value and the maximum number of preamble transmission attempts.

[0122] Optionally, the second characteristic parameter includes the initial received target power of the preamble; and

the parameter determining unit 102 is configured to: if the PRACH extended transmission level information is not the first PRACH extended transmission level, determine that: the initial received target preamble power corresponding to the information of the extended PRACH transmission level is equal to the sum of the initial received target preamble power and power control step linearly varying voltages that correspond to level information that relates to the extended PRACH transmission, and which is one level lower than the level information i PRACH extended transmission, or the initial received preamble target power corresponding to the PRACH extended transmission level information is a fixed power offset value plus the sum of the initial received preamble target power and power control step linearly varying voltage, which correspond to the level information related to the extended PRACH transmission , and which is one level lower than the information of the PRACH extended transmission level; or

if the information of the PRACH extended transmission level is the first level of the PRACH extended transmission, determine that: the initial received target preamble power corresponding to the information of the extended PRACH transmission level is the initial received preamble target power configured by the network device or the initial received preamble target power corresponding to the information PRACH extended transmission level is equal to the sum of the initial received target power of the preamble and the step of adjusting the power of the linearly varying voltage that correspond to the transmission PRACH, the initial or accepted target preamble power corresponding to the transmission level information extended PRACH, a fixed power offset value plus the sum of the received preamble initial target power and the power control step of linearly changing voltage which correspond to the transmission PRACH.

[0123] Optionally, the second characteristic parameter includes the number of attempts to transmit the preamble; and

the parameter determination unit 102 is configured to: set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the level information that relates to the extended PRACH transmission, which is one level lower, what is the level information of the extended PRACH transmission; or set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1; or set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the PRACH transmission.

[0124] Optionally, the second characteristic parameter includes path loss or threshold path loss; and

the parameter determining unit 102 is configured to: set path loss corresponding to the information of the PRACH extended transmission level equal to the lowest path loss to determine the information of the PRACH extended transmission level; or set the path loss threshold corresponding to the information of the PRACH extended transmission level equal to the smallest path loss threshold to determine the information of the PRACH extended transmission level.

[0125] Optionally, the second characteristic parameter includes a power offset value associated with the PRACH extended transmission level information; and

the parameter determining unit 102 is configured to: set a power offset value associated with the PRACH extended transmission level information equal to the difference between the largest path loss or threshold path loss to determine the PRACH extended transmission level information and path loss estimated by the UE terminal; or set the power offset value associated with the PRACH extended transmission level information equal to the difference between the sum of the smallest path loss or threshold path loss to determine the first PRACH extended transmission level and the product obtained by multiplying the PRACH extended transmission level information , to determine the level information of the extended PRACH transmission, and path loss estimated by the UE.

[0126] Optionally, the parameter determining unit 102 is further configured to: if the information of the PRACH extended transmission level is not the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level is equal to the sum of the difference between the initial number of attempts preamble corresponding to the information of the PRACH extended transmission level, and 1, and the number of available preamble transmission attempts corresponding to information of the advanced PRACH transmission level, increase the information of the advanced PRACH transmission level by one level; or if the PRACH extended transmission level information is not the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information on one level; or if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the sum of the difference between the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level information, and 1, and the number of available attempts to transmit the preamble, the corresponding information of the PRACH extended transmission level, to carry out the operation of postponing the transmission and attempt to retransmit the preamble starting with the lowest information of the PRACH extended transmission level, or perform a postpone operation and attempt to retransmit the preamble, storing the PRACH extended transmission level information as the highest information of the PRACH advanced transmission level, or Notify a higher level of unsuccessful extended random access attempts or if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level, when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the number of available preamble transmission attempts corresponding to the PRACH advanced transmission level information, perform a postponing operation and attempt re-send the preamble starting at the lowest information level of the extended PRACH transmission, or perform a postpone operation I transmit and try to retransmit the preamble, saving the PRACH extended transmission level information as the highest PRACH advanced transfer level information, or adjust the delay parameter of the transmission, or notify a higher level of an unsuccessful extended random access attempt.

[0127] In addition, the parameter determining unit 102 is further configured to determine that: the quantities that relate to the available preamble transmission attempts and which correspond to all the information of the PRACH extended transmission level are the same, or the quantities that belong to the available preamble transmission attempts, which correspond to at least two levels of the extended PRACH transmission are different.

[0128] Optionally, the parameter determining unit 102 is configured to determine that: the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information is configured by the network device, or the number of available preamble transmission attempts corresponding to the PRACH advanced transmission level information, or the number of available preamble transmission attempts corresponding to the information of the PRACH extended transmission level is determined according to a predetermined rule.

[0129] 2. Optionally, if the first characteristic parameter includes the transmitted power,

the parameter determination unit 102 is configured to: if the information of the PRACH extended transmission level is the nth PRACH extended transmission level, determine that: the transmitted power of the extended PRACH transmission is the maximum transmit power of the UE, or the transmitted power of the extended PRACH transmission is the value of the allocated power PRACH extended transmission level information, where n is a positive integer.

[0130] Optionally, the parameter determining unit 102 is configured to: determine the value of the allocated power of the PRACH extended transmission level information according to a predetermined value; or determine the value of the allocated power of the PRACH extended transmission level information according to the configuration implemented by the network device.

[0131] Optionally, the parameter determining unit 102 is configured to determine that the values of the allocated power of at least two levels of the extended PRACH transmission are different in the values of the allocated power of the information of the extended PRACH transmission level.

[0132] 3. Optionally, if the first characteristic parameter includes a preamble format,

the parameter determining unit 102 is configured to determine that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two levels of the PRACH extended transmission are different.

[0133] Optionally, the parameter determining unit 102 is configured to: in the process of determining that the preamble formats associated with at least two levels of the extended PRACH transmission are different, if there are N levels of the extended PRACH transmission, determine that: the first N1 levels the extended PRACH transmission in N levels of the extended PRACH transmission are associated with the first preamble format, and the subsequent N-N1 extended PRACH transmission levels in the N levels of the extended PRACH transmission are associated with the second preamble format, where N and N1 are positive numbers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0134] Optionally, the parameter determining unit 102 is configured to determine that the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0135] Optionally, the parameter determining unit 102 is configured to determine that preamble format 4 is not used for the extended PRACH transmission.

[0136] Optionally, the parameter determining unit 102 is configured to determine that: the used preamble format associated with the determined information of the advanced PRACH transmission level is predefined, or the preamble format associated with the specific information of the advanced PRACH transmission level is configured by the network device.

[0137] 4. Optionally, the first characteristic parameter includes a time-frequency resource; and

the parameter determining unit 102 is configured to: determine that the time-frequency resources associated with the first M1 levels of the extended PRACH transmission in the M neighboring PRACH advanced transmission levels include the first time-frequency resource; and determine that the time-frequency resources associated with the subsequent M-M1 extended PRACH transmission levels in the M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0138] Before presenting a method according to embodiments of the present invention, we describe the random access process of a terminal according to the prior art. FIG. 2, an optional random access process is presented in detail, which, in particular, is as follows:

[0139] 201. The UE sends a random access preamble (Msg 1) to the base station.

[0140] At this stage, the UE sends a random access preamble to the base station using the PRACH (Physical Random Access Channel, physical random access channel). A random access preamble includes a portion of a cyclic prefix (Cyclic Prefix, CP) whose duration is equal toT _CPand part of a sequence whose duration is equal toT _SEQ.

[0141] Currently, the random access preamble has five optional formats. For random access preamble in different formats,T _SEQ andT _CP have different meanings as shown in table 1 whereT _s indicates the unit of time, and, in general,T _s= 1 / (15,000 × 2048) seconds. In the frequency domain, PRACH occupies 1.08 MHz, that is, six PRB.

Table 1 Random Access Preamble Parameters

Preamble format T _CP T _SEQ 0 3168 · T _s 24576 · T _s one 21024 · T _s 24576 · T _s 2 6240 · T _s 2 · 24576 · T _s 3 21024 · T _s 2 · 24576 · T _s four* 448 · T _s 4096 · T _s

[0142] In FDD (Frequency Division Duplex, Frequency Division Duplex) system, random access can be performed using one of the 0-3 preamble formats. In TDD (Time Division Duplex, Time Division Duplex), in addition to the 0-3 preamble formats, preamble format 4 can also be used when the length of the UpPTS time (Uplink Pilot Time Slot, pilot uplink time slot) special configuration podagra equal to 4384 ·T _s and 5120 ·T _s. One preamble format is used in all random access processes in a cell, and the base station configures a physical random access channel configuration index (prach-ConfigurationIndex, random access packet channel) for a UE (user equipment, terminal) using SIB2 (System Information Block Type2, block type 2 system information) to specify the preamble format used in the random access process.

[0143] In total, there are 64 random access preambles in a cell, and in 64 preambles, some of the allocated preambles are reserved for non-ad hoc random access, and the rest of the preambles are used for contentional random access.

[0144] For contention-based random access, the UE randomly selects a preamble from the set of preambles used for contention-based random access, and selects, from a predetermined time resource and a predetermined frequency resource, a resource to send the selected preamble, which allows multiple UEs to simultaneously send the same preamble and a subsequent resolution decision is required. For non-contentious random access, the base station configures, using dedicated signaling, a dedicated preamble and a time resource and a frequency resource, which serve to send the preamble, and the UE performs random access using the dedicated preamble.

[0145] The transmitted power PPRACH for sending a random access preamble from the UE is obtained according to the following formula: PPRACH = min {P _{CMAX, c}(i), PREAMBLE_RECEIVED_TARGET_POWER +PL _c } _ [dBm], where min {} indicates an operation to calculate the minimum value,P _{CMAX, c}(i) - the maximum value of the transmitted power of the UE in the subframe numberi,PL _c  - the value of the losses in the downlink, dBm associated with the preamble format, powerRampingStep is the step of adjusting the power by a linearly varying voltage, and PREAMBLE_TRANSMISSION_COUNTER is the number of preamble transmissions.

[0146] preambleInitialReceivedTargetPower is the initial received preamble target power and is a parameter configured by the base station for the UE using SIB2, and DELTA_PREAMBLE is the power offset value associated with the preamble format and is a fixed value. If the UE fails to complete one random access process, the UE resends the random access preamble, where the preamble can be sent a maximum of preambleTransMax times, and the maximum number of preambleTransMax preamble transmissions is a parameter configured using SIB2. In the case of sending the preamble preambleTransMax once, the random access process is not successfully completed, the UE indicates a higher level random access problem. The initial value of PREAMBLE_TRANSMISSION_COUNTER is 1, and the counter value is incremented by 1 each time a preamble is sent again. When the UE resends the random access preamble, the transmitted power gradually increases in adjustment mode with a linearly varying voltage until the maximum value is reachedP _{CMAX, c}(ia) transmitted power. Each time a preamble is sent, the power increase value is the power adjustment step of the linearly varying powerRampingStep voltage, and this parameter is configured by the base station for the UE using SIB2.

[0147] 202. The base station sends a random access response (Msg 2) to the UE.

[0148] Upon detecting a random access preamble, the base station sends a random access response (RAR). The RAR random access response is carried over the PDSCH (Physical Downlink Shared Channel, physical downlink shared channel), and the PDSCH is dispatched using PDCCH (Physical Downlink Control Channel, physical downlink control channel) that is scrambled using the RA-RNTI ( Random Access Radio Network Temporary Identifier (temporary random access radio network identifier). The PDSCH includes a RAPID (Random Access Preamble Index, Random Access Preamble Index) that is used to indicate the random access preamble detected by the base station. After sending the random access preamble, the UE detects the PDCCH in each subframe in the random access response interval. Upon detecting a PDCCH that is scrambled using the RA-RNTI corresponding to the UE, the UE continues to demodulate the PDSCH indicated by the PDCCH. If the RAPID included in the PDSCH indicates the random access preamble that the UE has selected, the PDSCH includes the RAR for the UE. If the UE does not receive the RAR for the UE in the random access response interval, the UE resends the random access preamble. The RAR additionally includes information such as a time alignment instruction, control information (UL provisioning) used to dispatch message 3 (Msg3) data, and a Cell Radio Network Temporary Identifier (Cell Radio Network Temporary Identifier) C-RNTI.

[0149] 203. The UE sends message 3 (Msg 3) to the base station.

[0150] Having successfully received the RAR for the UE in the random access response interval, the UE sends, using the PUSCH (Physical Uplink Shared Channel, physical uplink shared channel), message 3 (i.e., Msg 3) during a random access process to the base station in a specific subframe that is, after taking RAR. Message 3 is scrambled using the Cell Radio Network Temporary Identifier (C-RNTI) included in the RAR, and includes the UE identifier in this cell, which is used to resolve the contention.

[0151] As described above, in contested random access, multiple UEs simultaneously send the same preamble. In this case, different UEs receive the same RAR to receive the same temporary C-RNTI, and therefore message 3 is sent on the same time-frequency resource using the same temporary C-RNTI that results in a message transmission conflict 3. If the base station cannot successfully decode message 3, the UE needs to retransmit message 3, and if the base station still cannot successfully decode message 3 when the maximum number of retransmissions of the UE is reached, the UE resends t preamble random access. If the base station successfully decodes message 3 of the UE, the contention on the UE is resolved in the downlink message in step 4.

[0152] 204. The base station sends a contention resolution message (Msg 4) to the UE.

[0153] The UE receives the contention resolution message sent by the base station and terminates the random access process. During the time recorded by the contention resolution timer, the UE detects the PDCCH and contention resolution message scheduled on the PDCCH, and if the UE receives a contention resolution message scrambled using the UE identifier in this cell or the contention resolution message that includes the UE identifier in this cell, random access is considered to be successful; if the UE has not yet received a contention resolution message scrambled using the UE identifier in this cell, or a contention resolution message that includes the UE identifier in this cell, after the timer expires, the UE resends the random access preamble.

[0154] MTC (machine type communication, machine type communication) means that information about the physical world is obtained by installing various devices that have specific capabilities for recording, computing, executing, and transmitting, and transmitting, collaborating, and processing information are implemented using a network to realize interconnection between man and object and the relationship between objects. MTC can be combined with the Internet to implement remote registration and facility management, and is widely applied to various areas, such as intelligent networks, intelligent transportation, environmental protection, government work, public security, intelligent home, intelligent fire fighting, industrial monitoring, care for the elderly and individual health monitoring. The development of MTC is called the third wave of information technology after computerization and the Internet, and is highly valued by a research institute and industry.

[0155] The cell coverage area generally means the following: when the base station sends a signal using the maximum transmit power, and if the UE can accurately detect the signal sent by the base station with a specific probability, the UE is considered to be within the cell coverage area. Many factors affect cell coverage, including radio path losses, user receiver sensitivity, etc. An important application of the MTC service is an intelligent meter, and this type of smart meter is usually installed in the basement of a building or insulated using a metal case, or installed in an old building with thick walls. In this scenario, the path loss between the UE and the base station is more significant.

[0156] When an LTE or LTE-A system supports the MTC service, the LTE / LTE-A network (coverage) does not need to be expanded. For example, the extension of coverage to an additional 20 dB or 15 dB is based on the coverage of an existing LTE / LTE-A network to ensure that the UE in the basement or in poor channel quality conditions is able to reliably communicate with the base station.

[0157] To reduce the power of the UE, an embodiment of the present invention provides a method for the enhanced transmission of a physical random access channel, as shown in FIG. 3, comprising the following steps:

[0158] 301. Information definitions of the extended transmission level of a physical random access channel PRACH.

[0159] In this embodiment of the present invention, the level information may be any of a level, level index, expansion level, expansion level index, repetition level, repetition level index, resource level, resource level index, resource set level, resource set level index, index resource set and resource index.

[0160] 302. Definitions of the first characteristic parameter, which relates to the extended PRACH transmission and which is associated with the information of the PRACH extended transmission level.

[0161] In this embodiment of the present invention, the first characteristic parameter may be at least one of the transmitted power, the preamble format, and the time-frequency resource.

[0162] Based on three specific optional parameters included in the first characteristic parameter, this embodiment of the present invention provides the following four solutions, in particular the following:

[0163] 1. Optionally, if the first characteristic parameter includes the transmit power, the determination of the first characteristic parameter that relates to the PRACH extended transmission and which is associated with the PRACH extended transmission information includes

determining the transmitted power of the extended PRACH transmission according to the second characteristic parameter corresponding to the information of the PRACH extended transmission level information, the second characteristic parameter being at least one of the initial received target power of the preamble, the number of preamble transmission attempts, path loss, threshold path loss, the step of adjusting the power of a linearly varying voltage, the power offset values associated with the preamble format, and the power offset values associated information transfer level extended PRACH.

[0164] Optionally, the second characteristic parameters corresponding to the different information of the PRACH extended transmission level are completely identical, or partially identical, or completely different.

[0165] Optionally, the fact that at least one parameter included in the second characteristic parameter corresponds to the information of the PRACH extended transmission level is determined according to the third characteristic parameter corresponding to the information of the level related to the extended PRACH transmission and which the level is lower than the information of the PRACH extended transmission level, the third characteristic parameter being at least one of the initial received target preamble power; the power of the linearly varying voltage, the fixed value of the power offset and the maximum number of attempts to transmit the preamble.

[0166] Optionally, the second characteristic parameter includes the initial received target preamble power, and the method for determining the second characteristic parameter corresponding to the information of the PRACH extended transmission level includes:

if the information of the PRACH extended transmission level is not the first PRACH extended transmission level, determining that: the initial received target power of the preamble corresponding to the information of the advanced PRACH transmission level is equal to the sum of the initial received target power of the preamble and the power control step by linearly varying voltage which relates to the extended PRACH transmission, and which is one level lower than the information from the PRACH extended transmission level, or the initial accepted target The new preamble power corresponding to the PRACH extended transmission level information is a fixed value of the power offset plus the sum of the initial received target preamble power and the power control step by ramp voltage, which correspond to the level information that relates to the extended PRACH transmission, and which is one level lower, what is the level information of the extended PRACH transmission; or

if the PRACH extended transmission level information is the first PRACH extended transmission level, determining that: the initial received target preamble power corresponding to the information of the extended PRACH transmission level is the initial received preamble target power configured by the network device or the initial received preamble target power corresponding to the information PRACH extended transmission level is equal to the sum of the initial received target power of the preamble and the step of adjusting the power of the linearly changing I voltage, which correspond to the transmission PRACH, the initial or accepted target preamble power corresponding to the transmission level information extended PRACH, a fixed power offset value plus the sum of the received preamble initial target power and the power control step of linearly changing voltage which correspond to the transmission PRACH.

[0167] Optionally, the second characteristic parameter includes the number of attempts to transmit the preamble, and the method for determining the second characteristic parameter corresponding to the information of the extended PRACH transmission level includes:

setting the initial value of the number of preamble transmission attempts corresponding to the PRACH extended transmission level information equal to 1 plus the maximum number of preamble transmission attempts corresponding to the level information related to the extended PRACH transmission and one level lower than the PRACH extended transmission level information; or setting the initial value of the number of attempts to transmit a preamble corresponding to the information of the PRACH extended transmission level equal to 1; or setting the initial number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the PRACH transmission.

[0168] Optionally, if the second characteristic parameter includes path loss or threshold path loss, a method for determining the second characteristic parameter corresponding to the information of the PRACH extended transmission level includes:

establishing path loss corresponding to the information of the PRACH extended transmission level equal to the lowest path loss to determine the information of the PRACH extended transmission level; or establishing a path loss threshold corresponding to the information of the PRACH extended transmission level equal to the lowest path threshold threshold for determining the PRACH extended transmission level information.

[0169] Optionally, the second characteristic parameter includes a power offset value associated with the PRACH extended transmission level information, and a method for determining the second characteristic parameter corresponding to the PRACH extended transmission level information includes:

determining a power offset value associated with the PRACH extended transmission level information equal to the difference between the largest path loss or threshold path loss to determine the information of the extended PRACH transmission level and path loss estimated by the UE; or

setting a power offset value associated with the PRACH extended transmission level information equal to the difference between the sum of the least path loss or threshold path loss to determine the first PRACH extended transmission level and the product obtained by multiplying the PRACH extended transmission level information by the path loss step, to determine the level information of the extended PRACH transmission, and path loss estimated by the UE terminal.

[0170] Furthermore, the method further includes:

if the information of the PRACH extended transmission level is not the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the sum of the difference between the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level information, and 1, and the number of available preamble transmission attempts, the corresponding information of the PRACH extended transmission level, an increase in the information of the advanced transmission level P Rach one level; or

if the PRACH extended transmission level information is not the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information one level; or

if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the sum of the difference between the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level information, and the number of available attempts to transmit the preamble, the corresponding information of the PRACH extended transmission level, the execution of the postponing operation and attempt to resend the preamble, starting with the lowest information of the PRACH extended transmission level, or perform a postpone operation and attempt to resend the preamble while maintaining the PRACH extended transmission level information as the highest information of the PRACH extended transmission level, or adjusting the delay parameter of the transmission, or notification of a higher level of an unsuccessful extended random access attempt; or

if the information of the extended PRACH transmission is the highest information of the extended PRACH transmission, when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the number of available preamble transmission attempts corresponding to the information of the advanced PRACH transmission level, carry out the postponing operation and retry sending the preamble, starting with the lowest level information of the extended PRACH transmission, or performing a postpone operation transmission and implementation attempts to resend the preamble while maintaining the level information extended PRACH transmission information as the highest level extended PRACH transmission, or delaying transmission parameter adjustment or alerted by UE, a higher level of an unsuccessful attempt extended random access.

[0171] Optionally, the quantities that relate to the available preamble transmission attempts and which correspond to all the information of the PRACH extended transmission level are the same, or the quantities that relate to the available preamble transmission attempts and that correspond to at least two PRACH advanced transmission levels are different .

[0172] Optionally, the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information is configured by the network device, or the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information is predetermined, or the number of available preamble transmission attempts corresponding to the advanced transmission level information PRACH is determined according to a predetermined rule.

[0173] 2. Optionally, if the first characteristic parameter includes the transmit power, the determination of the first characteristic parameter that relates to the PRACH extended transmission and which is associated with the PRACH extended transmission information includes:

if the information of the extended PRACH transmission level is the nth extended PRACH transmission level, determining that: the transmitted transmission power of the extended PRACH transmission is the maximum transmit power value of the UE, or the transmitted transmission power of the extended PRACH transmission is the value of the allocated power of the PRACH extended transmission information, where n - positive integer.

[0174] Optionally, the value of the allocated power of the PRACH extended transmission level information is predetermined; or the value of the allocated power of the PRACH extended transmission level information is configured by the network device.

[0175] Optionally, the values of the allocated power of at least two levels of the extended PRACH transmission are different.

[0176] 3. Optionally, if the first characteristic parameter includes a preamble format, the determination of the first characteristic parameter that relates to the PRACH extended transmission and which is associated with the PRACH extended transmission level information includes:

determining that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two PRACH extended transmission levels are different.

[0177] Optionally, determining that the preamble formats associated with at least two levels of the PRACH extended transmission are different include:

if there are N PRACH extended transmission levels, the first N1 extended PRACH transmission levels in N PRACH extended transmission levels are associated with the first preamble format, and the subsequent N-N1 extended PRACH transmission levels in N PRACH advanced transmission levels are associated with the second preamble format, where N and N1 are positive integers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0178] Optionally, the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0179] Optionally, preamble format 4 is not used for the extended PRACH transmission.

[0180] Optionally, the preamble format associated with the determined information of the PRACH extended transmission level is predefined, or the preamble format associated with the specific information of the PRACH extended transmission level is configured by a network device.

[0181] 4. Optionally, if the first characteristic parameter includes a time-frequency resource, determining the first characteristic parameter that relates to the extended PRACH transmission and that is associated with the information of the extended PRACH transmission level includes:

determining that time-frequency resources associated with the first M1 levels of the extended PRACH transmission in the M neighboring levels of the extended PRACH transmission include a first time-frequency resource; and determining that time-frequency resources associated with subsequent M-M1 extended PRACH transmission levels at M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0182] 303. Perform an extended PRACH sending according to the first characteristic parameter.

[0183] This embodiment of the present invention is applied to an LTE or LTE-A system with enhanced coverage, and there are multiple repeat levels of an extended PRACH transmission, for example, levels 1, 2, and 3 of a repeat of an extended PRACH transmission. Index numbering can be performed at multiple levels of repetition, i.e., repetition level indices. In another mode, there are multiple levels or multiple expansion levels of the extended PRACH transmission, and the index is numbered at multiple levels, i.e. level indexes, or the index is numbered at multiple extension levels, i.e. extension level indexes. The PRACH extended transmission level information is any of a level, a level index, an extension level, an extension level index, a repetition level, and a repetition level index.

[0184] For each level of the extended PRACH transmission, the number of repetitions to send the preamble from the UE and the set of PRACH extended transmission resources that correspond to each level of the extended PRACH transmission are indicated by the system or signaled. The PRACH extended transmission resource set includes one or more PRACH extended transmission resources. The resources of the extended PRACH transmission include a code resource (preamble), a time resource and a frequency resource, which are used to send the preamble. The time resource and the frequency resource may be collectively referred to as a time-frequency resource. If the UE determines the information of the PRACH extended transmission level, the UE re-sends, according to the number of repetitions corresponding to the determined information of the PRACH extended transmission level, a preamble on a resource that belongs to the PRACH extended transmission and that is included in the PRACH extended transmission resource set. For different information of the level of the extended PRACH transmission, the number of repetitions for sending a preamble with a UE is different. As the required expansion of the system coverage increases, the path loss between the UE and the base station also increases, the level information that relates to the extended PRACH transmission that is used by the UE to successfully complete the random access process also increases, and the number of repetitions to send the preamble increases. Since there are multiple levels of the extended PRACH transmission, there are also multiple sets of resources of the extended PRACH transmission, and multiple sets of resources are used on the UE to send the preamble according to different repetition numbers. The PRACH resource set may be referred to as the PRACH extended transmission resource set level, and one or more PRACH extended transmission resources that are included in one PRACH extended transmission resource set may be collectively referred to as the PRACH extended transmission resource level, and the index numbering is separately resource set, resource set level, resource and resource level that are related to the PRACH extended transfer, i.e. resource set index, resource set level index, resource index and resource level index related to extended PRACH transmission. Information of the advanced PRACH transmission level may also be any of the resource level, resource level index, resource set level, resource set level index, resource set index and resource index. The index numbering is performed on the number of repetitions for sending the preamble from the UE, i.e. the index of the number of repetitions. The PRACH extended transmission level information may also be one of a repetition number and a repetition index.

[0185] Optionally, the information of the PRACH extended transmission level is determined according to path loss between the base station and the UE. The base station or other network device predetermines the lowest path loss or threshold path loss and the greatest path loss or threshold path loss to determine the level of the extended PRACH transmission, and the path loss between the base station and the UE is divided into X bands according to the smallest path loss or threshold path loss and the highest path loss or threshold path loss, and each path loss range corresponds to one level of the extended PRACH transmission, due to which The level of the enhanced PRACH transmission is determined according to the lowest path loss or threshold path loss and the highest path loss or threshold path loss. For example, path losses or threshold path losses are predefined by x0, x1 and x2, path losses between a base station and a UE are divided into three bands, and the first, second and third (or 1st, 2nd and 3rd d) PRACH Extended Transmission Levels are defined as follows:

first level of extended PRACH transmission: x0 dB <path loss ≤ x1 dB;

second level of the extended PRACH transmission: x1 dB <path loss ≤ x2 dB; and

third level of extended PRACH transmission: path loss> x2.

[0186] For example, for the first level of an extended PRACH transmission, the smallest path loss or threshold path loss and the largest path loss or threshold path loss to determine the level information of the extended PRACH transmission are x0 and x1, respectively. The lowest path loss or threshold path loss and the greatest path loss or threshold path loss and / or the value of X may be predetermined or signaled by the base station to the UE. The index is numbered in the path loss range, that is, the path loss range index. Path loss can also be one of the required coverage expansion values, the received reference signal power, the received reference signal quality and channel quality information, and the index numbering is performed on the coverage expansion value, the received reference signal power, the reference signal quality and the quality information range. the channel, that is, the index of the coverage extension range, the index of the range of the received power of the reference signal, the index of the range of the received quality of the reference signal, and The index band channel quality information. The information of the PRACH extended transmission level can also be one of the coverage expansion value, the coverage expansion range index, the path loss index, the path loss range index, the received reference signal power, the received signal power range index of the reference signal, the received signal quality, the received range index reference signal quality, channel quality information, and channel quality information range index.

[0187] At step 301 in this embodiment of the present invention, the PRACH extended transmission level information may be determined in several ways. At step 301, it may also be determined that the extended transmission is not to be performed on the PRACH, that is, it is determined that the PRACH transmission is carried out when the preamble is sent according to the existing format without repetition. For example, the PRACH transmission level information and / or the PRACH extended transmission level information may be determined according to the path loss range between the UE and the network side or another measurement parameter or monitoring parameter, which may reflect the path loss range; or it is determined that the information of the PRACH extended transmission level is the first (lowest) level of the extended PRACH transmission; or it is determined that the information of the PRACH extended transmission level is level information obtained by increasing the initially determined information of the PRACH extended transmission level by one level of the PRACH extended transmission; or it is determined that the PRACH transmission is changed to the first level of the extended PRACH transmission. The specific mode for determining the PRACH extended transmission level information is not limited in this embodiment of the present invention.

[0188] In one mode, the determination of the PRACH transmission level information and / or the PRACH extended transmission information is as follows: a portion of the PRACH transmission level information and / or the PRACH extended transmission information is determined according to the path loss range between the UE and the network side or another measurement parameter or monitoring parameter reflect the range of path loss, and other information of the PRACH extended transmission level the UE determines by sequentially attempting from the PRACH transmission level information and / or from low racial level information transmission to high information level advanced transmission. If the attempt based on the PRACH transmission level information and / or the low information of the extended transmission level fails, the attempt is made based on a higher order of the advanced transmission level. For example, if the level information of the extended PRACH transmission includes the first, second, and third levels, the PRACH transmission is denoted as 0th level. If path loss ≤ x3 dB, it is determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the 0th PRACH transmission level; if path loss is> x4 dB, it is determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the third level of the PRACH extended transmission; if x3 dB <path loss ≤ x4 dB, it is first determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the 0th PRACH transmission level (or the first PRACH extended transmission level). In case of failure detection, it is determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the first level of the PRACH extended transmission attempt (or the second level of the PRACH extended transmission), etc. In this embodiment of the present invention, the first characteristic parameter is associated with the level information, and the characteristic parameter used for the extended PRACH send can be quickly and accurately determined, which reduces the power of the terminal.

[0189] In another mode, the determination of the level information of the PRACH transmission and / or the extended PRACH transmission is as follows: it is determined that the information of the PRACH extended transmission level is the first (lowest) level of the extended PRACH transmission. If the UE obtains the master information by receiving the enhanced master information block and / or acquires system information by receiving the enhanced system information block, the UE sends the preamble using the first level of the extended PRACH transmission. If the UE fails to perform random access by sending a preamble using the nth level of the extended PRACH transmission, the UE sends the preamble using the (n + 1) -th level of the extended PRACH transmission, where n is a positive integer. Extended main information block means a main information block that is re-sent in a radio frame several times. An extended system information block includes one or more of an expanded system information block of a type 1 system information block, an extended system information block of a system information block of type k, and an extended system information block of a system information block of type m, where k and m are positive integers, and, in particular, k = 2. An extended system information block of a system information block of type 1 means a system information block of a system information block of type 1 in subframe # 5 of an even-numbered radio frame and / or a block of system information that relates to a system information block of type 1 and which is resubmitted in another subframe. An extended system information block of a system information block of type k means a system information block that includes configuration information of an extended PRACH transmission. At least one type of configuration information in the configuration information included in the system information block of the system information block of type m is identical to the configuration information included in the system information block of the system information block of type 1.

[0190] An embodiment of the present invention further provides a network device, as shown in FIG. 4, including: a parameter determining unit 401 and a receiving unit 402.

[0191] The parameter determination unit 401 is configured to determine the first characteristic parameter, which relates to the extended PRACH transmission and which is associated with the advanced transmission level information of the physical random access channel PRACH.

[0192] In this embodiment of the present invention, the first characteristic parameter may be at least one of a preamble format and a time-frequency resource.

[0193] The receiving unit 402 is configured to perform the extended reception of the PRACH according to the first characteristic parameter, which is associated with all the information of the advanced PRACH transmission level and which is determined by the parameter determination unit 401.

[0194] Optionally, as shown in FIG. 5, the network device further includes:

the sending unit 501, configured to: before the receiving unit 402 performs an extended reception of the PRACH according to the first characteristic parameter associated with all the information of the extended PRACH transmission level, send, to the UE, at least one of the following configuration information: initial received the preamble target power, the number of available preamble transmission attempts, the corresponding information of the PRACH extended transmission level, and the value of the allocated power of the PRACH extended transmission information, which allows em UE to determine, according to the configuration information, the transmitted power, which relates to the extended PRACH transmission, which is associated with the PRACH extended transmission level information, or increase the PRACH extended transmission level information by one level, or carry out the postponing operation and attempt to send the preamble starting with the lowest level information of the extended PRACH transmission, or perform a postpone operation and attempt to resend the preamble, keeping the information tion level of the extended PRACH transmission as the highest level of information extended PRACH transmission, or adjust the delaying transmission parameter, or to notify a higher level of unsuccessful attempts to expand the random access.

[0195] Optionally, the parameter determining unit 401 is further configured to determine that: the quantities that relate to the available preamble transmission attempts and which correspond to all the information of the PRACH extended transmission level are the same, or the quantities that belong to the available preamble transmission attempts and that correspond to at least two levels of the extended PRACH transmission are different.

[0196] Optionally, the parameter determination unit 401 is further configured to determine that the values of the allocated power of at least two levels of the extended PRACH transmission are all different in all the information of the PRACH extended transmission level.

[0197] Based on various optional parameters of the first characteristic parameter, there may be various solutions for determining the first characteristic parameter that relates to the extended PRACH transmission and which is associated with the information of the advanced PRACH transmission level, and this embodiment of the present invention provides a solution that specifically implies following:

[0198] Optionally, if the first characteristic parameter includes a preamble format, the parameter determining unit 401 is configured to determine that: the preamble formats associated with all the PRACH extended transmission level information are the same, or the preamble formats associated with at least The two levels of the extended PRACH transmission are different.

[0199] Optionally, the parameter determining unit 401 is configured to: in the process of determining that the preamble formats associated with at least two levels of the extended PRACH transmission are different, if there are N levels of the extended PRACH transmission, determine that: the first N1 levels the extended PRACH transmission in N levels of the extended PRACH transmission are associated with the first preamble format, and the subsequent N-N1 extended PRACH transmission levels in the N levels of the extended PRACH transmission are associated with the second preamble format, where N and N1 are positive numbers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0200] Optionally, the parameter determining unit 401 is configured to determine that the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0201] Optionally, the parameter determining unit 401 is configured to determine that preamble format 4 is not used for the extended PRACH transmission.

[0202] Optionally, the parameter determining unit 401 is configured to determine that the preamble format associated with the determined information of the PRACH extended transmission level is predetermined; or a sending unit 501 included in the network device is configured to send, to the UE, preamble format configuration information associated with the determined information of the PRACH extended transmission level.

[0203] Optionally, if the first characteristic parameter includes a time-frequency resource, the parameter determining unit 401 is configured to: determine that the time-frequency resources associated with the first M1 levels of the extended PRACH transmission in M neighboring levels of the extended PRACH transmission include yourself first time-frequency resource; and determine that the time-frequency resources associated with the subsequent M-M1 extended PRACH transmission levels in the M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0204] An embodiment of the present invention further provides a method for the enhanced transmission of a physical random access channel, and this method can be implemented on the network device side. As shown in FIG. 6, the method includes the following steps:

[0205] 601. The definition of the first characteristic parameter, which relates to the extended PRACH transmission and which is associated with the information of the extended transmission level of the physical random access channel PRACH.

[0206] In this embodiment of the present invention, the level information may be any of a level, level index, expansion level, expansion level index, repetition level, repetition level index, resource level, resource level index, resource set level, resource set level index, index resource set and resource index. In this embodiment of the present invention, the first characteristic parameter may be at least one of a preamble format and a time-frequency resource.

[0207] 602. Implementation of the extended reception of the PRACH according to the first characteristic parameter associated with all the information of the level of the extended PRACH transmission.

[0208] In addition, before implementing the extended PRACH reception according to the first characteristic parameter associated with all the information of the PRACH extended transmission level, the method includes: sending, to the UE, at least one of the following configuration information: initial received target preamble power, the number of available attempts to transmit the preamble, the corresponding information of the PRACH extended transmission level, and the value of the allocated power of the PRACH extended transmission level information, which allows the UE to determine, according to info configuration, transmitted power, which is related to the extended PRACH transmission and which is related to the PRACH extended transmission level information, or an increase in the PRACH extended transmission level information, or performing a postpone operation and attempting to send the preamble starting from the lowest information PRACH extended transmission level, or performing a postponing operation and attempting to re-send the preamble while maintaining the advanced level information th PRACH transmission as the highest level of information extended PRACH transmission or delaying the transmission parameter adjustment or notice of a higher level of unsuccessful attempts to expand the random access.

[0209] Optionally, the quantities that relate to the available preamble transmission attempts and which correspond to all the information of the PRACH extended transmission level are the same, or the quantities that relate to the available preamble transmission attempts and that correspond to at least two PRACH advanced transmission levels are different .

[0210] Optionally, the values of the allocated power of at least two levels of the extended PRACH transmission are different.

[0211] Based on various optional parameters of the first characteristic parameter, there may be various solutions for determining the first characteristic parameter that relates to the extended PRACH transmission and which is associated with the information of the advanced PRACH transmission level, and this embodiment of the present invention provides a solution that specifically implies following:

[0212] Optionally, if the first characteristic parameter includes the preamble format, the definition of the first characteristic parameter that relates to the PRACH extended transmission and which is associated with the PRACH extended transmission information includes

determining that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two PRACH extended transmission levels are different.

[0213] Optionally, determining that the preamble formats associated with at least two levels of the PRACH extended transmission are different include:

if there are N PRACH extended transmission levels, the first N1 extended PRACH transmission levels in N PRACH extended transmission levels are associated with the first preamble format, and the subsequent N-N1 extended PRACH transmission levels in N PRACH advanced transmission levels are associated with the second preamble format, where N and N1 are positive integers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0214] Optionally, the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0215] Optionally, preamble format 4 is not used for the extended PRACH transmission.

[0216] Optionally, the preamble format associated with the determined information of the PRACH extended transmission level is predetermined; or the preamble format configuration information associated with the determined information of the PRACH extended transmission level is sent to the UE.

[0217] Optionally, if the first characteristic parameter includes a time-frequency resource, the determination of the first characteristic parameter that relates to the extended PRACH transmission and that is associated with the information of the extended PRACH transmission level includes:

determining that time-frequency resources associated with the first M1 levels of the extended PRACH transmission in the M neighboring levels of the extended PRACH transmission include a first time-frequency resource; and determining that time-frequency resources associated with subsequent M-M1 extended PRACH transmission levels at M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0218] The main problem to be resolved in the present invention is the power loss of the UE, due to the existing method of calculating power in the extended PRACH transmission. In addition, for different preamble formats, the duration of the sequence may vary, and for one level of extended PRACH transmission, the number of repetitions to resend the preamble is related to the preamble format. Thus, the preamble format, which is related to the extended PRACH transmission and which is associated with the PRACH extended transmission level information, may also need to be defined. This embodiment of the present invention relates to aspects of determining, for example, transmit power, preamble format, and time-frequency resource, which are related to the extended PRACH transmission and which are associated with the information of the extended PRACH transmission level.

[0219] Solutions and specific embodiments of the present invention are described using the extended PRACH transmission in an LTE or LTE-A system, and the advanced PRACH transmission method provided in the present invention can also be applied to another system or channel on which CDM resources are multiplexed for example, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system or a universal system e mobile (Universal Mobile Telecommunication System, UMTS).

[0220] According to the LTE or LTE-A system, the PRACH extended transmission method provided in this embodiment of the present invention is described in detail below. In this embodiment of the present invention, the PRACH is a channel that carries a preamble; an extended PRACH transmission or a PRACH transmission may be referred to as an extended transmission or transmission of a channel that carries a preamble, or may be referred to as an extended transmission or transmission of a preamble. Extended PRACH transmission means extended transmission mode, for example, retransmission or spread spectrum transmission carried out on the preamble. PRACH transmission means transmission carried out on the preamble according to the existing format without repetition. Transmission involves sending and receiving. In the course of an extended PRACH transmission, retransmission carried out on a preamble according to a specific number of repetitions, or transmission in an extended spectrum carried out on a preamble according to a specific spreading factor, is referred to as one attempt to transmit the preamble. During the PRACH transmission, a one-time transmission performed on the preamble is referred to as one attempt to transmit the preamble. The solution in this embodiment of the present invention is described, by way of example, using preamble re-transmission. The method in this embodiment of the present invention is described in detail below by the UE.

[0221] First, the information of the PRACH extended transmission level is determined, and the level information is one of a level, a level index, an extension level, an extension level index, a repetition level, a repetition level index, a resource level, a resource level index, a resource set level, a resource level index, resource set index and resource index. In an LTE or LTE-A system with coverage expansion, there are multiple levels of an extended PRACH transmission, and the number of repetitions to send a preamble with a UE that corresponds to each level of an extended PRACH transmission is indicated by the system or signaled in advance. If the UE determines the information of the PRACH extended transmission level, the UE resends the preamble according to the number of repetitions corresponding to the determined information of the PRACH extended transmission level. The information of the PRACH extended transmission level can also be one of the number of repetitions, the index of the number of repetitions, the coverage expansion value, the coverage expansion range index, path loss, path loss range index, received reference signal power, received reference signal power index, received the quality of the reference signal, the index of the range of the received quality of the reference signal, the channel quality information and the index of the channel quality information.

[0222] In this embodiment of the present invention, the information of the PRACH extended transmission level may be determined in several ways. It may also be determined that the extended transmission is not to be implemented on the PRACH, that is, it is determined that the PRACH transmission is carried out when the preamble is sent according to the existing format without repetition. For example, the PRACH transmission level information and / or the PRACH extended transmission level information may be determined according to the path loss range between the UE and the network side or another measurement parameter or monitoring parameter, which may reflect the path loss range; or it is determined that the information of the PRACH extended transmission level is the first (lowest) level of the extended PRACH transmission; or it is determined that the information of the PRACH extended transmission level is level information obtained by increasing the initially determined information of the PRACH extended transmission level by one level of the PRACH extended transmission; or it is determined that the PRACH transmission is changed to the first level of the extended PRACH transmission. The specific mode for determining the PRACH extended transmission level information is not limited in this embodiment of the present invention.

[0223] In one mode, the determination of the PRACH transmission level information and / or the PRACH extended transmission information is as follows: a portion of the PRACH transmission level information and / or the PRACH extended transmission information is determined according to the path loss range between the UE and the network side or another measurement parameter or monitoring parameter reflect the range of path loss, and other information of the PRACH extended transmission level the UE determines by sequentially attempting from the PRACH transmission level information and / or from low racial level information transmission to high information level advanced transmission. If the attempt based on the PRACH transmission level information and / or the low information of the extended transmission level fails, the attempt is made based on a higher order of the advanced transmission level. For example, if the level information of the extended PRACH transmission includes the first, second, and third levels, the PRACH transmission is denoted as 0th level. If path loss ≤ x3 dB, it is determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the 0th PRACH transmission level; if path loss is> x4 dB, it is determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the third level of the PRACH extended transmission; if x3 dB <path loss ≤ x4 dB, it is first determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the 0th PRACH transmission level (or the first PRACH extended transmission level). In case of failure detection, it is determined that the information of the PRACH transmission level and / or the PRACH extended transmission is the first level of the PRACH extended transmission attempt (or the second level of the PRACH extended transmission), etc. In addition, the first characteristic parameter of the extended PRACH transmission is determined, the first characteristic parameter of the extended PRACH transmission is associated with certain information of the PRACH extended transmission level, and the first characteristic parameter includes one or more of the transmitted power, the preamble format and the time-frequency resource.

[0224] In another mode, the determination of the level information of the PRACH transmission and / or the extended PRACH transmission is as follows: it is determined that the information of the PRACH extended transmission level is the first (lowest) level of the extended PRACH transmission. If the UE obtains the master information by receiving the enhanced master information block and / or acquires system information by receiving the enhanced system information block, the UE sends the preamble using the first level of the extended PRACH transmission. If the UE fails to perform random access by sending a preamble using the nth level of the extended PRACH transmission, the UE sends the preamble using the (n + 1) -th level of the extended PRACH transmission, where n is a positive integer. Extended main information block means a main information block that is re-sent in a radio frame several times. An extended system information block includes one or more of an expanded system information block of a type 1 system information block, an extended system information block of a system information block of type k, and an extended system information block of a system information block of type m, where k and m are positive integers, and, in particular, k = 2. An extended system information block of a system information block of type 1 means a system information block of a system information block of type 1 in subframe # 5 of an even-numbered radio frame and / or a block of system information that relates to a system information block of type 1 and which is resubmitted in another subframe. An extended system information block of a system information block of type k means a system information block that includes configuration information of an extended PRACH transmission. At least one type of configuration information in the configuration information included in the system information block of the system information block of type m is identical to the configuration information included in the system information block of the system information block of type 1.

[0225] In addition, the extended send of the PRACH is performed according to the determined first characteristic parameter of the extended PRACH transmission.

[0226] The present invention is described in detail below using four embodiments.

[0227] An implementation option 1 of the present invention:

[0228] When the first characteristic parameter of the extended PRACH transmission is transmit power, the determination of the first characteristic parameter of the extended PRACH transmission, the first characteristic parameter of the extended PRACH transmission is associated with certain information of the advanced PRACH transmission level, includes: determining the transmit power of the extended PRACH transmission according to at least , the second characteristic parameter corresponding to the PRACH extended transmission level information. The second characteristic parameter includes one or more of the initial received preamble target power, the number of preamble transmission attempts, the path loss, the threshold path loss, the step of adjusting the power with a linearly varying voltage, the power offset values associated with the preamble format, and the power offset values associated with the PRACH extended transmission level information. The second characteristic parameters corresponding to different information of the PRACH extended transmission level may be completely identical or partially identical or completely different. In particular, there are several implementation options:

[0229] Option 1:

[0230] The second characteristic parameter includes the initial received target preamble power, the number of attempts to transmit the preamble, the path loss, and the step of adjusting the power with a linearly varying voltage. Transmitted power PPRACH, which is related to the extended PRACH transmission and which is associated with the PRACH extended transmission level information that is defined by UE = min {P _{CMAX, c}(i), PREAMBLE_RECEIVED_TARGET_POWER +PL _c } _ [dBm], where min {} indicates an operation to calculate the minimum value,P _{CMAX, c}(i) - the maximum value of the transmitted power of the UE in the subframe numberiandPL _c  - path loss, the value of which is estimated by the UE. If the PRACH advanced transmission level information that the UE determines is level information obtained by increasing the PRACH extended transmission level information in a previous attempt to send a preamble carried out by the UE by one level, or the 0th PRACH transmission level is increased to the first advanced transmission level PRACH, andPL _c evaluated on the UE in the enhanced PRACH extended layer information is approximately identical to the estimated for the initial layer information and therefore the UE may still usePL _c estimated for initial level information. Predicted to do it. During the extended PRACH transmission, each attempt to send a preamble includes several retransmissions, and the number of included retransmissions corresponds to the information of the advanced PRACH transmission level, which is determined by the UE. For each level of an extended PRACH transmission, the initial value of the number of preamble transmission attempts is 1. The initial value is used to make the first attempt to send a preamble using one level of the extended PRACH transmission. After each attempt to send a preamble, the number of attempts to transmit the preamble is increased by 1, and powerRampingStep is the step of adjusting the power with a linearly varying voltage, which can be the value configured by the base station using SIB2.

[0231] If the PRACH extended transmission level information that the UE determines is not the first PRACH extended transmission level, where the first PRACH extended transmission level is the lowest information of the extended PRACH transmission level, the initial received target power of the PREAMBLE_INITIAL_RECEIVED_TARGET_POWER preamble corresponding to the PRACH advanced transmission level information that is determined by UE is determined according to the third characteristic parameter corresponding to the level information, which relates to the extended PRACH transmission, and which and one level lower than level information transmission extended PRACH, wherein the third characteristic parameter includes at least one of a preamble initial received target power, step power adjustment linearly changing voltage and the fixed value of the power offset. In particular, the initial received target power of the preamble is equal to the sum of the initial received target power of the preamble and the power control step by linearly varying voltage, which correspond to the level information that relates to the extended PRACH transmission and which is one level lower than the information from the extended PRACH transmission level, or equal to the sum of the initial target power of the preamble and the step of adjusting the power of the linearly varying voltage + fixed value of the power offset. The step of adjusting the power with a linearly varying voltage is equal to the value (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep when the UE makes the last attempt to send the preamble before increasing one level of the extended PRACH transmission.

[0232] If the PRACH extended transmission level information that the UE defines is the first PRACH extended transmission level, the initial PradamBRE_INITIAL_RECEIVED_TARGET_POWER target abstraction power corresponding to the PRACH advanced transmission level information that the UE defines is equal to preambleInitialReceivedTargetPower, where preambleInitral is 146, this is 75% applicable, that's 14% found in this value that is set by the UE is set to PreambleInitialReceivedTargetPower station using SIB2, or the initial received preamble target power corresponding to the extended transmission level information and the PRACH, which is determined by the UE, is equal to the sum of the initial received target power of the preamble and the power control step by the linearly varying voltage, which correspond to the PRACH transmission, and the power control step by the linearly varying voltage is equal to the value (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep of the preamble last time during the PRACH transmission (the preamble is not retransmitted) carried out before the extended PRACH transmission, or the initial received target preamble power corresponding to the extension level information The PRACH transmission, which is determined by the UE, is equal to the sum of the initial received target power of the preamble and the power control step by linearly varying voltage, which correspond to the PRACH transmission + fixed power offset value.

[0233] Option 2:

[0234] The second characteristic parameter includes the initial received target preamble power, the number of attempts to transmit the preamble, the path loss, and the step of adjusting the power with a linearly varying voltage. Transmitted power PPRACH, which is related to the extended PRACH transmission and which is associated with the PRACH extended transmission level information that is defined by UE = min {P _{CMAX, c}(i), PREAMBLE_RECEIVED_TARGET_POWER +PL _c } _ [dBm], where min {} indicates an operation to calculate the minimum value,P _{CMAX, c}(i) - the maximum value of the transmitted power of the UE in the subframe numberiandPL _c  - path loss, the value of which is estimated by the UE. If the PRACH advanced transmission level information that the UE determines is level information obtained by increasing the PRACH extended transmission level information in a previous attempt to send a preamble carried out by the UE by one level, or the 0th PRACH transmission level is increased to the first advanced transmission level PRACH, andPL _c evaluated on the UE in the enhanced PRACH extended layer information is approximately identical to the estimated for the initial layer information and therefore the UE may still usePL _c estimated for initial level information. Received preamble preeam PRACH transmission, the corresponding initial received preamble target power is equal to preambleInitialReceivedTargetPower. PREAMBLE_TRANSMISSION_COUNTER is the number of attempts to transmit the preamble, and during the extended PRACH transmission, each attempt to send a preamble includes several resendings, and the number of included resendings corresponds to the information of the level of the extended PRACH transmission that the UE determines. After each attempt to send a preamble, the number of attempts to transmit the preamble is increased by 1, and powerRampingStep is the step of adjusting the power with a linearly varying voltage, which can be the value configured by the base station using SIB2.

[0235] Unlike option 1, if the information of the extended PRACH transmission level that the UE determines is not the first extended PRACH transmission level, where the first extended PRACH transmission level is the lowest information of the extended PRACH transmission level, the initial value of the number of transmission attempts of the preamble PREAMBLE_TRANSMISSION_COUNTER corresponding to the level information of the extended PRACH transmission, which is determined by the UE, is determined according to the third characteristic parameter corresponding to the level information that relates to PRACH extended transmission, and one level lower than the PRACH extended transmission level information, with the third characteristic parameter being the maximum number of preamble transmission attempts. The initial value is used to make the first attempt to send the preamble using one level of the extended PRACH transmission. In particular, the initial value of the number of PREAMBLE_TRANSMISSION_COUNTER preamble transmission attempts corresponding to the information of the extended PRACH transmission level, which is determined by the UE, is 1 plus the maximum number of preamble transmission attempts corresponding to the information from the advanced PRACH transmission level, which is one level lower than PRACH extended transmission level information. The maximum number of preamble transmission attempts corresponding to the level information, which is related to the extended PRACH transmission, and which is one level lower than the PRACH extended transmission level information, is equal to the number of preamble transmission attempts of the last attempt to send the preamble, before the UE increases one PRACH extended transmission level.

[0236] If the PRACH extended transmission level information that the UE determines is the first PRACH extended transmission level, the initial value of the number of transmission attempts of the PREAMBLE_TRANSMISSION_COUNTER preamble corresponding to the PRACH extended transmission level information that the UE determines is 1; or the initial value of the number of attempts to transmit the preamble PREAMBLE_TRANSMISSION_COUNTER corresponding to the information of the level of the extended PRACH transmission that is determined by the UE is 1 plus the maximum number of attempts to transmit the preamble corresponding to the transmission of the PRACH. The maximum number of preamble transmission attempts corresponding to a PRACH transmission is equal to the number of preamble transmissions of the last attempt to send a preamble carried out during the PRACH transmission (the preamble is not resent) made before the extended PRACH transmission.

[0237] Option 3:

[0238] The second characteristic parameter includes the initial received target preamble power, the number of preamble transmission attempts, path loss or threshold path loss and the step of adjusting the power with a linearly varying voltage. Transmitted power PPRACH, which is related to the extended PRACH transmission and which is associated with the PRACH extended transmission level information that is defined by UE = min {P _{CMAX, c}(i), PREAMBLE_RECEIVED_TARGET_POWER +PL _c } _ [dBm], where min {} indicates an operation to calculate the minimum value,P _{CMAX, c}(i) - the maximum value of the transmitted power of the UE in the subframe numberiandPL _c  - path losses or threshold path losses. Accepted by the prover preamble power is equal to preambleInitialReceivedTargetPower. PREAMBLE_TRANSMISSION_COUNTER is the number of attempts to transmit the preamble, and during the extended PRACH transmission, each attempt to send a preamble includes several resendings, and the number of included resendings corresponds to the information of the level of the extended PRACH transmission that the UE determines. For each level of an extended PRACH transmission, the initial value of the number of preamble transmission attempts is 1. The initial value is used to make the first attempt to send a preamble using one level of the extended PRACH transmission. After each attempt to send a preamble, the number of attempts to transmit the preamble is increased by 1, and powerRampingStep is the step of adjusting the power with a linearly varying voltage, which can be the value configured by the base station using SIB2.

[0239] Path loss or path loss thresholdPL _c  differ from those in option 1 and option 2. In option 3, the base station or other network device pre-sets the lowest path loss or threshold path loss and the greatest path loss or threshold path loss to determine the level information of the extended PRACH transmission, path loss between the network device and the UE are divided into X bands according to the lowest path loss or threshold path loss and the largest path loss or threshold path loss, and each path loss range is It is the same level of the extended PRACH transmission, so that the information of the advanced PRACH transmission level is determined according to the lowest path loss or threshold path loss and the highest path loss or threshold path loss. For example, path losses or threshold path losses are predefined by x0, x1, and x2; path losses between a network device and a UE are divided into three ranges, and the first, second, and third (or 1st, 2nd, and 3rd) d) PRACH Extended Transmission Levels are defined as follows:

first level of extended PRACH transmission: x0 dB <path loss ≤ x1 dB;

second level of the extended PRACH transmission: x1 dB <path loss ≤ x2 dB; and

third level of extended PRACH transmission: path loss> x2.

[0240] For example, for the first level of an extended PRACH transmission, the smallest path loss or threshold path loss and the largest path loss or threshold path loss to determine the level information of the extended PRACH transmission are x0 and x1, respectively. The lowest path loss or threshold path loss and the greatest path loss or threshold path loss and / or X value can be predetermined or signaled by the network device to the UE.

[0241] If the PRACH extended transmission level information that the UE determines is level information obtained by increasing the PRACH extended transmission level information in a previous attempt to send a preamble by the UE by one level, or the PRACH advanced transmission level information that the UE determines is level of the extended PRACH transmission, and the UE transmits the PRACH in a previous attempt to send a preamble without repeating the preamble, in this case path lossPL _c corresponding to the PRACH extended transmission level information that the UE determines is the least path loss to determine the PRACH extended transmission level information, or path threshold lossPL _c The corresponding information of the PRACH extended transmission level, which is determined by the UE, is the smallest path loss threshold for determining the PRACH extended transmission level information. For example, if the PRACH extended transmission level information that the UE determines is the first level of the PRACH extended transmission,PL _c  equal to x0.

[0242] If the PRACH extended transmission level information that the UE determines is not the first level of the extended PRACH transmission, path loss or path loss thresholdPL _c The corresponding PRACH extended layer information that the UE determines is path loss estimated at the UE.

[0243] Alternatively, for each level of the extended PRACH transmission, path lossPL _c corresponding to the PRACH extended transmission level information that the UE determines is the least path loss to determine the PRACH extended transmission level information, or path threshold lossPL _c The corresponding information of the PRACH extended transmission level, which is determined by the UE, is the smallest path loss threshold for determining the PRACH extended transmission level information.

[0244] Option 4:

[0245] In Embodiment 4, the second characteristic parameter may further include at least one of a power offset value associated with the preamble format, a power offset value associated with the PRACH extended transmission level information, and a PRACH extended transmission power offset value.

[0246] Accordingly, the accepted target preamble power is PREAMBLE_RECEIVED_TARGET_POWER preambleInitialReceivedTargetPower + [DELTA_PREAMBLE] - [DELTA_LEVEL] - [DELTA_CI] + (PREAMBLE_TRANSMISSION_COUNTER-1) * powerRampingStep.

[0247] Transmit power preamble PPRACH = min {P _{CMAX, c}(i) - [DELTA_LEVEL] - [DELTA_CI], PREAMBLE_RECEIVED_TARGET_POWER +PL _c } [dBm], where [] indicates that the parameter in square brackets is optional.

[0248] DELTA_PREAMBLE is the power offset value associated with the preamble format and is a fixed value, and the value of the DELTA_PREAMBLE may be the same as in the original version. DELTA_CI is the PRACH Extended Power Offset value and is a fixed value, and the DELTA_CI value can be specified in the protocol or can be configured by the network device for the UE. For all information of the advanced PRACH transmission level, the value is the same. DELTA_LEVEL is the power offset value associated with the PRACH extended transmission level information. The values of other parameters may be the same as in the original version, or may be determined in any of the options 1-3, which, therefore, has no restrictions.

[0249] In Embodiment 4, if the base station or other network device predetermines the least path loss or threshold path loss and the greatest path loss or threshold path loss to determine the information of the advanced PRACH transmission level, the information of the advanced PRACH transmission level is determined according to the lowest loss in the path or threshold losses in the path and the greatest path losses or threshold losses in the path, the specific method of determining is the same as described in embodiment 3, and the details are not described here again . The method for determining the power offset value DELTA_LEVEL associated with the information of the PRACH extended transmission level includes:

setting a power offset value associated with the PRACH extended transmission level information equal to the difference between the largest path loss or threshold path loss to determine the information of the extended PRACH transmission level and path loss estimated by the UE. For example, if the information of the PRACH extended transmission level, which is determined by the UE, is the first level of the extended PRACH transmission, DELTA_LEVEL = x1 - PL _c , where PL _c is the path loss estimated by the UE.

[0250] Alternatively, the power offset value associated with the PRACH extended transmission level information is equal to the difference between the sum of the smallest path loss or threshold path loss to determine the first level of the PRACH extended transmission and the product obtained by multiplying the PRACH extended transmission level information by the path loss step , to determine the level information of the extended PRACH transmission, and path loss estimated by the UE. In the above computation mode, the PRACH extended transmission level information is a number for indicating the PRACH extended transmission level information, and if the PRACH extended transmission level information is the nth extended PRACH transmission level, the number of the PRACH extended transmission level information is n. In this embodiment, the path loss step for determining the PRACH extended transmission level information is equal to the difference between the largest path loss (threshold path loss) for determining the PRACH extended transmission level information and the least path loss (threshold path loss) for determining information the level of the extended PRACH transmission, and for all information of the advanced PRACH transmission level, the path loss steps for determining the information of the advanced PRACH transmission level are the same. For example, if the PRACH extended transmission level information that the UE defines is the second PRACH extended transmission level, DELTA_LEVEL = x0 + 2 * (x1-x0) -PL _c wherePL _c  - path loss estimated at UE, and x1-x0 = x2-x1.

[0251] In this embodiment, the effect of the near-far effect can be eliminated and the power consumption of the UE can be reduced.

[0252] The method according to Embodiment 1 further includes a method used at the UE to increase the information of the level of the extended PRACH transmission by one level and attempt to resend the preamble using the increased information of the level of the extended PRACH transmission.

[0253] In particular, if the PRACH extended transmission level information is not the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the initial value of the preamble transmission attempt number corresponding to the PRACH extended transmission level information available preamble transmission attempts corresponding to the PRACH extended transmission level information, the PRACH extended transmission level information is increased by one n level; or

if the PRACH extended transmission level information is not the highest PRACH extended transmission level information, when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information, the PRACH advanced transmission level information is increased one level; or

if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the initial value of the number of transmission attempts of the preamble corresponding to the information of the PRACH extended transmission level - 1 + number of available preamble transmission attempts corresponding to the PRACH extended transmission level information:

(1) The postpone transfer operation is performed, and the preamble retry is attempted starting from the lowest information of the advanced PRACH transmission level, which includes selecting a random transmission deferment time based on the UE transmission deferral parameter (backoff), where with a uniform distribution between 0 and the value of the parameter of the delay of the transfer. The UE delays the delay of transmission, attempts to re-send the preamble starting with the lowest information of the PRACH extended transmission level, and recalculates the initial value of the attempt to send the preamble. The UE may also include the step of adjusting the parameter of the delay of the transmission.

(2) Alternatively, the postpone transfer operation is performed, and the preamble retry is attempted while storing the extended PRACH transmission level information as the highest information of the extended PRACH transmission level, which includes selecting a random transmission delay period based on the UE transmission delay parameter where the value of the transfer delay time is consistent with a uniform distribution between 0 and the value of the transfer delay parameter. The UE postpones the transmission delay time, attempts to retransmit the preamble, storing the PRACH extended transmission level information as the highest information of the PRACH extended transmission level, and recomputes the initial value of the preamble sending attempt. The UE may also include the step of adjusting the parameter of the delay of the transmission.

(3) Alternatively, the transmission deferment parameter is adjustable, that is, the UE adjusts the transmission deferment parameter stored on the UE, and the adjustment may be to increase or decrease the transmission deferral parameter by the UE.

(4) Alternatively, the UE notifies a higher level of an unsuccessful extended random access attempt.

[0254] Alternatively, if the PRACH extended transmission level information is the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the number of available preamble transmission attempts corresponding to the PRACH advanced transmission level information, and The attempt to resend the preamble is performed starting from the lowest information of the level of the extended PRACH transmission, or the cancel operation yvaniya transmission is performed, and an attempt to re-send preamble information is carried out while maintaining the level of the extended PRACH transmitting information of both the high-level extended PRACH transmission, or delaying the transmission parameter is adjusted or UE notifies a higher level of an unsuccessful attempt extended random access.

[0255] The number of available preamble transmission attempts corresponding to the PRACH extended transmission level information means the number of preamble transmission attempts that can be made using one PRACH advanced transmission level, that is, the maximum number of available preamble transmission attempts using a single PRACH advanced transmission level. For different informations of the PRACH extended transmission level, the number of available preamble transmission attempts is the same, or the quantities that are related to the available preamble transmission attempts and which correspond to at least two levels of the PRACH extended transmission are different.

или

, где preambleTransMax - максимальное количество передач преамбулы, сконфигурированное базовой станцией, и

- операция округления в большую сторону.[0256] The number of available preamble transmission attempts corresponding to the PRACH extended transmission level information can be configured by the base station for the UE using SIB2, and the same number of available preamble transmission attempts can be configured for all the PRACH advanced transmission level information Preambles can be configured for various PRACH extended transmission level information. Alternatively, the number of available preamble transmission attempts corresponding to the information of the PRACH extended transmission level is predetermined. For example, the number of available attempts to transmit a preamble is indicated in the protocol. Alternatively, the number of available preamble transmission attempts corresponding to the information of the PRACH extended transmission level is determined according to a predetermined rule. For example, the number of available preamble transmission attempts corresponding to each PRACH extended transmission level is equal to

 or

where preambleTransMax is the maximum number of preamble transmissions configured by the base station, and

 - operation rounding up.

[0257] The method of Embodiment 1 further includes a method used by the UE to change the PRACH transmission (level 0) to the PRACH extended transmission and attempt to send the preamble again using the first level of the PRACH advanced transmission.

[0258] In particular, if the number of PRACH transmission preamble transmission attempts that the UE performs is equal to the initial value of the transmission number of the PRACH transmission preamble transmission — 1 + the number of available transmission attempts of the PRACH transmission preamble, the PRACH transmission is replaced by the extended PRACH transmission, and PRACH first level extended transmission; or

if the number of PRACH transmission preamble transmission attempts made by the UE is equal to the number of available transmission attempts of the PRACH transmission preamble, the PRACH transmission is replaced by the extended PRACH transmission, and the preamble is retransmitted using the first level of the PRACH extended transmission.

.[0259] The number of available attempts to transmit a preamble of a PRACH transmission means the number of attempts to transmit a preamble that can occur during a PRACH transmission. The number of available attempts to transmit a PRACH transmit preamble may differ from the existing preambleTransMax. The number of available transmission attempts of the PRACH transmission preamble can be configured by the base station for the UE using SIB2, or specified in the protocol. Optionally, the number of available attempts to transmit the preamble of the PRACH transmission is obtained by calculating according to the existing preambleTransMax. For example, the number of available attempts to transmit a PRACH transmit preamble is

.

[0260] In this embodiment, when the UE resends the preamble according to the repetition number for increased information of the PRACH extended transmission level, the UE guarantees the continuity of the transmitted power of the preamble of the initial information of the advanced PRACH transmission level, and therefore the probability that the power of the first several attempts to send the preamble from the UE does not the requirement of successful completion of the random access process is greatly reduced, which prevents the power loss of the UE. In addition, in option 2 of this embodiment, it is also possible to avoid the error occurring when the transmitted power is calculated according to path loss estimated at the UE.

[0261] An implementation option 2 of the present invention:

[0262] When the first characteristic parameter of the extended PRACH transmission is transmit power, the determination of the first characteristic parameter of the extended PRACH transmission, the first characteristic parameter of the extended PRACH transmission is associated with certain information of the advanced PRACH transmission level, includes: if the information of the advanced PRACH transmission level that the UE determines, is the nth level of the extended PRACH transmission, determining that the transmitted power of the extended PRACH transmission is the maximum value The transmit power is UE, where n is an integer greater than 0. For example, the value of n can be one or more of 1, 2, and 3 (one, two, and three), and, for example, n is 2 and 3.

[0263] In this embodiment, after the UE determines that the PRACH extended transmission level information is the nth PRACH extended transmission level, the UE directly attempts to send the preamble according to the maximum transmit power value, which avoids the error occurring when the transmitted power is calculated according to path loss estimated at UE.

[0264] Given that on the same time resource and the same frequency resource, the UE sends preambles of different information of the extended PRACH transmission level, and if the preambles of different information of the extended PRACH transmission level are sent according to the maximum transmitted power of the UE, there is a problem near - long-term effect. The method in this embodiment further includes: if the information of the extended PRACH transmission level that the UE determines is the nth extended PRACH transmission level, determining that the transmitted power of the extended PRACH transmission is the value of the extracted power of the advanced PRACH transmission level information.

[0265] The value of the allocated power of the PRACH extended transmission level information may be predetermined, for example, the value of the allocated power is indicated in the protocol; or the value of the allocated power of the PRACH extended transmission level information is configured by the base station, for example, the base station configures the value of the allocated power for the UE using SIB2. The values of the allocated power of at least two levels of the extended PRACH transmission are different. For example, for at least two levels of an extended PRACH transmission, the preamble is sent using the same time-frequency resource, the values of the allocated power of at least two levels of the extended PRACH transmission are different.

[0266] In this embodiment, after the UE determines that the PRACH extended transmission level information is the nth PRACH extended transmission level, the UE directly attempts to send the preamble according to the value of the allocated power of the PRACH extended transmission level information, thereby avoiding the error that occurs when the transmitted power is calculated according to path loss estimated by the UE. In addition, on the same time / frequency resource, the UE sends preambles of different information of the extended PRACH transmission level, and if the allocated power values used by the preambles of different information of the extended PRACH transmission level are different, the preamble power values that relate to different level information extended PRACH transmissions, and that arrive at the base station, are about the same, which prevents the effects of the near-far effect.

[0267] An implementation option 3 of the present invention:

[0268] For different preamble formats, the duration of the sequence may vary, and for one level of the extended PRACH transmission, the number of repetitions to resend the preamble is related to the preamble format. Thus, in this embodiment, the preamble format is defined for the PRACH extended transmission level information.

[0269] When the first characteristic parameter of the extended PRACH transmission is the preamble format, the determination of the first characteristic parameter of the extended PRACH transmission, the first characteristic parameter of the extended PRACH transmission is associated with certain information of the PRACH extended transmission level, includes: determining that the preamble formats associated with all the layer information the PRACH extended transmission is the same, or the preamble formats associated with at least two levels of the extended PRACH transmission are different.

[0270] In a cell, all the information in the PRACH extended transmission level uses the same preamble format. For example, preamble format 3 is used for the extended PRACH transmission. The method for determining the preamble format used is not limited in this embodiment of the present invention, and you can refer to the out-of-the-box definition solution: i.e. the index of the physical configuration of the random access channel prach-ConfigurationIndex, the preamble format used for random access.

[0271] Alternatively, in a cell, the preamble formats associated with at least two levels of the extended PRACH transmission are different. Preambles that are re-sent according to at least two levels of the PRACH extended transmission use different preamble formats.

[0272] In this embodiment, the determination that the preamble formats associated with at least two levels of the extended PRACH transmission are different includes: if there are N levels of the extended PRACH transmission, the first N1 levels of the extended PRACH transmission are in N levels of the extended PRACH transmission associated with the first preamble format, and the subsequent N-N1 extended PRACH transmission levels in the N extended PRACH transmission levels associated with the second preamble format, where N and N1 are positive integers, N1 is less than N, and the first preamble format and the second pr format Preamble different. The first preamble format and the second preamble format may have the same CP length and different sequence lengths. For example, the first preamble format and the second preamble format are preamble formats in preamble formats 1 and 3. For example, if there are three levels of an extended PRACH transmission, the first level of an extended PRACH transmission is associated with preamble format 1, and the second level of an extended PRACH transmission and the third level of an extended PRACH transmission are associated with preamble format 3.

[0273] In this embodiment, the first N1 levels of the extended PRACH transmission in the N levels of the extended PRACH transmission are adjacent levels, i.e. the first level of the extended PRACH transmission is sequentially increased by one level, and is increased only N1-1 times to obtain N1 levels of the extended PRACH transmission; the subsequent N-N1 levels of the extended PRACH transmission are adjacent levels, that is, the (N1 + 1) -th level of the extended PRACH transmission is sequentially increased by one level, and the increase is performed N-N1-1 times to obtain the N-N1 levels of the extended PRACH transmission.

[0274] The method in this embodiment further includes: the preamble format 4 cannot be used for the extended PRACH transmission. For example, in a TDD system with coverage extension, the preamble format, which is configured by the base station using the prach-ConfigurationIndex physical random access channel configuration index in the sent SIB2, is not preamble format 4.

[0275] In this embodiment, the preamble format associated with the determined information of the PRACH extended transmission level may be predetermined, for example, the preamble format is defined in the protocol; or the preamble format associated with the determined information of the PRACH extended transmission level is configured by the base station for the UE using SIB2. The base station can directly include, in SIB2, an information element (IE) or a field for configuring a preamble format, and configure the same preamble format or different preamble formats for information of the PRACH extended transmission level. Alternatively, the base station includes the prach-ConfigurationIndex random access channel configuration index in SIB2 and configures the same preamble format or different preamble formats for the PRACH extended transmission level information using the index.

[0276] According to the method in this embodiment, the preamble format associated with the PRACH extended transmission level information is determined. If the preamble formats associated with all the information in the PRACH extended transmission layer are the same, there is a relatively simple implementation of random access. If the preamble formats associated with at least two levels of the extended PRACH transmission are different, one or more levels of the extended PRACH transmission may use the preamble format with a relatively long sequence length, which reduces the preamble CP overhead.

[0277] An implementation option 4 of the present invention:

[0278] When the first characteristic parameter of the extended PRACH transmission is a time-frequency resource, the determination of the first characteristic parameter of the extended PRACH transmission, the first characteristic parameter of the extended PRACH transmission is associated with certain information of the level of the extended PRACH transmission, includes: determining that time-frequency resources associated with the first M1 levels of the extended PRACH transmission at M adjacent levels of the extended PRACH transmission, include the first time-frequency resource; and determining that time-frequency resources associated with subsequent M-M1 extended PRACH transmission levels at M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M. For example, there are three adjacent levels of the extended PRACH transmission, the time-frequency resource associated with the first level of the extended PRACH transmission includes the current time-frequency resource used for PRACH transmission and the time-frequency resources associated with the second level of the extended PRACH transmission and the third level of the extended PRACH transmission include a second time-frequency resource, where the second time-frequency resource and the current the time-frequency resource used for PRACH transmission is different. It should be noted that in this embodiment, the time-frequency resources associated with the multiple levels of the extended PRACH transmission include the first or second time-frequency resource means that the transmission of the random access preamble using the multiple levels of the extended PRACH transmission shares one and the same first or second time-frequency resource, and the possibility of using a time-frequency resource different from the shared time-frequency resource for before The types of preamble implemented using a single level of an extended PRACH transmission on multiple levels of an extended PRACH transmission are not limited in this embodiment.

[0279] In this embodiment, the first M1 levels of the extended PRACH transmission from the M levels of the extended PRACH transmission are adjacent levels, i.e. the first level of the extended PRACH transmission is sequentially increased by one level, and is increased only M1-1 times to obtain the M1 levels of the extended PRACH transmission; the subsequent M-M1 levels of the extended PRACH transmission are adjacent levels, that is, the (M1 + 1) -th level of the extended PRACH transmission is sequentially increased by one level, and the increase is performed M-M1-1 times to obtain the M-M1 levels of the extended PRACH transmission.

[0280] According to the method in this embodiment, since the level information that relates to the extended PRACH transmission and which belongs to the preamble transmitted on the same time-frequency resource is a neighboring level, on the same time-frequency resource, the difference between the losses in the preamble path, which are related to different information of the extended PRACH transmission level, and which are sent by the UE, is limited, and the difference between the power attenuation values when the preambles arrive at the base station Chen, and therefore the influence of the near-far effect is reduced. In addition, on the same time-frequency resource, if the preambles of different information of the PRACH extended transmission level use the CDM resource multiplexing mode, the same preamble format must be used, the first time-frequency resource and the second time-frequency resource are different time-frequency resources; in this case, subsequent M-M1 PRACH extended transmission levels may use a preamble format different from that used by the first M1 PRACH extended transmission levels, and therefore the preamble format with a relatively long sequence length may be used, which reduces the preamble CP overhead.

[0281] An embodiment of the present invention further provides another terminal, as shown in FIG. 7, including: a receiver 701, a transmitter 702, a processor 703, and a memory 704.

[0282] The processor 703 is configured to: determine the level information of the extended transmission of the physical random access channel PRACH, and, in this embodiment of the present invention, the level information may be any of the level, level index, expansion level, expansion level index, repetition level Repeat, Resource Level, Resource Level Index, Resource Level, Resource Level Index, Resource Level Index and Resource Index; and determine the first characteristic parameter that relates to the extended PRACH transmission and which is associated with the information of the PRACH extended transmission level, and in this embodiment of the present invention, the first characteristic parameter may be at least one of the transmitted power, the preamble format and time-frequency resource. The transmitter 702 is configured to perform the extended send of the PRACH according to the first characteristic parameter.

[0283] This embodiment of the present invention is applied to an LTE or LTE-A system with enhanced coverage, and there are multiple repeat levels of an extended PRACH transmission, for example, levels 1, 2, and 3 of a repeat of an extended PRACH transmission. Index numbering can be performed at multiple levels of repetition, i.e., repetition level indices. In another mode, there are multiple levels or multiple expansion levels of the extended PRACH transmission, and the index is numbered at multiple levels, i.e. level indexes, or the index is numbered at multiple extension levels, i.e. extension level indexes. The PRACH extended transmission level information is any of a level, a level index, an extension level, an extension level index, a repetition level, and a repetition level index.

[0284] For each level of the extended PRACH transmission, the number of repetitions to send the preamble from the UE and the set of PRACH extended transmission resources that correspond to each level of the extended PRACH transmission are indicated by the system or signaled. The PRACH extended transmission resource set includes one or more PRACH extended transmission resources. The resources of the extended PRACH transmission include a code resource (preamble), a time resource and a frequency resource, which are used to send the preamble. The time resource and the frequency resource may be collectively referred to as a time-frequency resource. If the UE determines the information of the PRACH extended transmission level, the UE re-sends, according to the number of repetitions corresponding to the determined information of the PRACH extended transmission level, a preamble on a resource that belongs to the PRACH extended transmission and that is included in the PRACH extended transmission resource set. For different information of the level of the extended PRACH transmission, the number of repetitions for sending a preamble with a UE is different. Increasing the required value of system coverage expansion, path loss between the UE and the network device is also increased, the level information, which belongs to the extended PRACH transmission and is used by the UE to successfully complete the random access process, also increases, and the number of repetitions to send the preamble increases. Since there are multiple levels of the extended PRACH transmission, there are also multiple sets of resources of the extended PRACH transmission, and multiple sets of resources are used on the UE to send the preamble according to different repetition numbers. The PRACH resource set may be referred to as the PRACH extended transmission resource set level, and one or more PRACH extended transmission resources that are included in one PRACH extended transmission resource set may be referred to as one PRACH extended transmission resource level, and the index numbering is separately resource set, resource set level, resource and resource level that are related to the PRACH extended transfer, i.e. resource set index, resource set level index, resource index and ur index resource related to the extended PRACH program. Information of the advanced PRACH transmission level may also be any of the resource level, resource level index, resource set level, resource set level index, resource set index and resource index. The index numbering is performed on the number of repetitions for sending the preamble from the UE, i.e. the index of the number of repetitions. The PRACH extended transmission level information may also be one of a repetition number and a repetition index.

[0285] Optionally, the information of the PRACH extended transmission level is determined according to the path loss between the network device and the UE. The base station or other network device presets the lowest path loss or threshold path loss and the greatest path loss or threshold path loss to determine the information of the extended PRACH transmission level, and the path loss between the network device and the UE are divided into X bands according to the smallest path loss or threshold path loss and the highest path loss or threshold path loss, and each path loss range corresponds to one level of the extended PRACH transmission, due to which, and The level information of the extended PRACH transmission is determined according to the lowest path loss or threshold path loss and the highest path loss or threshold path loss. For example, path losses or threshold path losses are predefined by x0, x1, and x2; path losses between a network device and a UE are divided into three ranges, and the first, second, and third (or 1st, 2nd, and 3rd) d) PRACH Extended Transmission Levels are defined as follows:

first level of extended PRACH transmission: x0 dB <path loss ≤ x1 dB;

second level of the extended PRACH transmission: x1 dB <path loss ≤ x2 dB; and

third level of extended PRACH transmission: path loss> x2.

[0286] For example, for the first level of an extended PRACH transmission, the smallest path loss or threshold path loss and the largest path loss or threshold path loss to determine the level information of the extended PRACH transmission are x0 and x1, respectively. The lowest path loss or threshold path loss and the greatest path loss or threshold path loss and / or X value can be predetermined or signaled by the network device to the UE. The index is numbered in the path loss range, that is, the path loss range index. Path loss can also be one of the required coverage expansion values, the received reference signal power, the received reference signal quality and channel quality information, and the index numbering is performed on the coverage expansion value, the received reference signal power, the reference signal quality and the quality information range. the channel, that is, the index of the coverage extension range, the index of the range of the received power of the reference signal, the index of the range of the received quality of the reference signal, and The index band channel quality information. The information of the PRACH extended transmission level can also be one of the coverage expansion value, the coverage expansion range index, the path loss index, the path loss range index, the received reference signal power, the received signal power range index of the reference signal, the received signal quality, the received range index reference signal quality, channel quality information, and channel quality information range index.

[0287] In this embodiment of the present invention, the first characteristic parameter is associated with the level information, and the characteristic parameter used for the extended PRACH send can be quickly and accurately determined, which reduces the power of the terminal.

[0288] Based on three specific optional parameters included in the first characteristic parameter, this embodiment of the present invention provides the following four solutions, in particular the following:

[0289] 1. Optionally, the first characteristic parameter includes the transmitted power; and

processor 703 is configured to determine the transmit power of the extended PRACH transmission according to the second characteristic parameter corresponding to the information of the advanced PRACH transmission level, the second characteristic parameter being at least one of the initial received target preamble power, the number of preamble transmission attempts, path loss, path loss thresholds, ramp voltage adjustment steps, power offset values associated with the preamble format, and s Achen power offset associated with the information transfer level extended PRACH.

[0290] Optionally, the processor 703 is configured to determine the transmit power of the extended PRACH transmission according to the second characteristic parameter corresponding to the information of the advanced PRACH transmission level, the second characteristic parameters corresponding to different information of the advanced PRACH transmission level being completely identical, or partially identical, or completely different .

[0291] Optionally, the processor 703 is configured to determine, according to a third characteristic parameter, a corresponding level information that relates to the extended PRACH transmission, and which is one level lower than the information of the advanced PRACH transmission level, and at least one parameter included in the second characteristic parameter corresponds to the level information of the extended PRACH transmission, with the third characteristic parameter being at least one of the initial received target m the preamble power, the step of adjusting the power with a linearly varying voltage, the fixed value of the power offset and the maximum number of attempts to transmit the preamble.

[0292] Optionally, the second characteristic parameter includes the initial received target power of the preamble; and

processor 703 is configured to: if the PRACH extended transmission level information is not the first PRACH extended transmission level, determine that: the initial received target preamble power corresponding to the information of the extended PRACH transmission level is equal to the sum of the initial received target preamble power and the power control step linearly varying voltage, which correspond to the level information that is related to the extended PRACH transmission, and which is one level lower than the extended level information PRACH cottages, or the initial received preamble target power corresponding to the PRACH extended transmission level information, is a fixed power offset value plus the sum of the initial received preamble target power and the power control step with linearly varying voltage, which correspond to the level information that relates to the extended PRACH transmission, and which is one level lower than the PRACH extended transmission level information; or

if the information of the PRACH extended transmission level is the first level of the PRACH extended transmission, determine that: the initial received target preamble power corresponding to the information of the extended PRACH transmission level is the initial received preamble target power configured by the network device or the initial received preamble target power corresponding to the information PRACH extended transmission level is equal to the sum of the initial received target power of the preamble and the step of adjusting the power of the linearly varying voltage that correspond to the transmission PRACH, the initial or accepted target preamble power corresponding to the transmission level information extended PRACH, a fixed power offset value plus the sum of the received preamble initial target power and the power control step of linearly changing voltage which correspond to the transmission PRACH.

[0293] Optionally, the second characteristic parameter includes the number of attempts to transmit the preamble; and

processor 703 is configured to: set the initial value of the number of preamble transmission attempts corresponding to the information of the advanced PRACH transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the level information that relates to the extended PRACH transmission and which is one level lower than the information PRACH extended transmission level; or set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1; or set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the PRACH transmission.

[0294] Optionally, the second characteristic parameter includes path loss or threshold path loss; and

processor 703 is configured to: set path loss corresponding to the information of the PRACH extended transmission level equal to the lowest path loss to determine the information of the PRACH extended transmission level; or set the path loss threshold corresponding to the information of the PRACH extended transmission level equal to the smallest path loss threshold to determine the information of the PRACH extended transmission level.

[0295] Optionally, the second characteristic parameter includes a power offset value associated with the PRACH extended transmission level information; and

processor 703 is configured to: set a power offset value associated with the PRACH extended transmission level information equal to the difference between the largest path loss or threshold path loss to determine the PRACH extended transmission level information and path loss estimated by the UE terminal; or set the power offset value associated with the PRACH extended transmission level information equal to the difference between the sum of the smallest path loss or threshold path loss to determine the first PRACH extended transmission level and the product obtained by multiplying the PRACH extended transmission level information , to determine the level information of the extended PRACH transmission, and path loss estimated by the UE.

[0296] Optionally, processor 703 is further configured to: if the PRACH extended transmission level information is not the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the sum of the difference between the initial number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level, and 1, and the number of available preamble transmission attempts corresponding to the level information PRACH extended transmission, increase the PRACH extended transmission level information by one level; or if the PRACH extended transmission level information is not the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information on one level; or if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the sum of the difference between the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level information, and 1, and the number of available attempts to transmit the preamble, the corresponding information of the PRACH extended transmission level, to carry out the operation of postponing the transmission and attempt to retransmit the preamble starting with the lowest information of the PRACH extended transmission level, or perform a postpone operation and attempt to retransmit the preamble, storing the PRACH extended transmission level information as the highest information of the PRACH advanced transmission level, or Notify a higher level of unsuccessful extended random access attempts or if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level, when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the number of available preamble transmission attempts corresponding to the PRACH advanced transmission level information, perform a postponing operation and attempt re-send the preamble starting at the lowest information level of the extended PRACH transmission, or perform a postpone operation I transmit and try to retransmit the preamble, saving the PRACH extended transmission level information as the highest PRACH advanced transfer level information, or adjust the delay parameter of the transmission, or notify a higher level of an unsuccessful extended random access attempt.

[0297] In addition, processor 703 is further configured to determine that: the quantities that relate to the available preamble transmission attempts and which correspond to all the information of the PRACH extended transmission level are the same, or the quantities that belong to the available preamble transmission attempts and which correspond, at least At least two levels of extended PRACH transmission are different.

[0298] Optionally, processor 703 is configured to determine that: the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information is configured by the network device, or the number of available preamble transmission attempts corresponding to the PRACH advanced transmission level information the preamble transmission attempts corresponding to the information of the PRACH extended transmission level is determined according to a predetermined rule.

[0299] 2. Optionally, if the first characteristic parameter includes the transmitted power,

processor 703 is configured to: if the information of the extended PRACH transmission level is the nth extended PRACH transmission level, determine that: the transmitted power of the extended PRACH transmission is the maximum transmit power of the UE, or the transmitted power of the advanced PRACH transmission PRACH extended transmission, where n is a positive integer.

[0300] Optionally, the processor 703 is configured to: determine the value of the allocated power of the level information of the extended PRACH transmission according to a predetermined value; or determine the value of the allocated power of the PRACH extended transmission level information according to the configuration implemented by the network device.

[0301] Optionally, the processor 703 is configured to determine that the values of the allocated power of at least two levels of the extended PRACH transmission are different in the values of the allocated power of the information of the extended PRACH transmission level.

[0302] 3. Optionally, if the first characteristic parameter includes a preamble format,

processor 703 is configured to determine that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two PRACH extended transmission levels are different.

[0303] Optionally, processor 703 is configured to: in the process of determining that the preamble formats associated with at least two levels of an extended PRACH transmission are different, if there are N levels of an extended PRACH transmission, determine that: the first N1 advanced transmission levels PRACH in the N levels of the extended PRACH transmission are associated with the first preamble format, and subsequent N-N1 levels of the extended PRACH transmission in the N levels of the extended PRACH transmission are associated with the second preamble format, where N and N1 are positive integers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0304] Optionally, the processor 703 is configured to determine that the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0305] Optionally, processor 703 is configured to determine that preamble format 4 is not used for extended PRACH transmission.

[0306] Optionally, the processor 703 is configured to determine that: the used preamble format associated with the determined information of the extended PRACH transmission level is predetermined, or the preamble format associated with the specific information of the advanced PRACH transmission level is configured by the network device.

[0307] 4. Optionally, the first characteristic parameter includes a time-frequency resource; and

processor 703 is configured to: determine that the time-frequency resources associated with the first M1 levels of the extended PRACH transmission in the M neighboring levels of the extended PRACH transmission include a first time-frequency resource; and determine that the time-frequency resources associated with the subsequent M-M1 extended PRACH transmission levels in the M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0308] An embodiment of the present invention further provides a network device, as shown in FIG. 8, including: a receiver 801, a transmitter 802, a processor 803, and a memory 804.

[0309] The processor 803 is configured to determine a first characteristic parameter that relates to the extended PRACH transmission and that is associated with the extended transmission level information of the physical random access channel PRACH.

[0310] In this embodiment of the present invention, the first characteristic parameter may be at least one of a preamble format and a time-frequency resource.

[0311] The receiver 801 is configured to perform the extended reception of the PRACH according to the first characteristic parameter, which is associated with all the information of the advanced PRACH transmission level and which is determined by the processor 803.

[0312] Optionally, as shown in FIG. 8, the network device further includes:

the transmitter 802, configured to: before the receiver 801 performs an extended reception of the PRACH according to the first characteristic parameter associated with all the information of the extended PRACH transmission level, send, to the UE, at least one of the following configuration information: initial received target power the preamble, the number of available attempts to transmit the preamble, the corresponding information of the PRACH extended transmission level, and the value of the allocated power of the PRACH extended transmission information, which allows the UE to limit, according to the configuration information, the transmitted power, which is related to the extended PRACH transmission, and which is associated with the PRACH extended transmission level information, or increase the PRACH advanced transmission level information by one level, or carry out the postponing operation and try to resend the preamble starting the lowest information level of the extended PRACH transmission, or carry out the operation of postponing the transmission and attempting to resend the preamble, keeping the information the PRACH extended transmission level as the highest information of the PRACH extended transmission level, or adjust the delay parameter of the transmission, or notify a higher level of an unsuccessful extended random access attempt.

[0313] Optionally, processor 803 is further configured to determine that: the quantities that relate to the available preamble transmission attempts and which correspond to all the information of the PRACH extended transmission level are the same, or the quantities that relate to the available preamble transmission attempts, which at least two levels of the extended PRACH transmission are different.

[0314] Optionally, the processor 803 is further configured to determine that the values of the allocated power of at least two levels of the extended PRACH transmission in all the information of the PRACH extended transmission level are different.

[0315] Based on various optional parameters of the first characteristic parameter, there may be various solutions for determining the first characteristic parameter that relates to the extended PRACH transmission and which is associated with the information of the advanced PRACH transmission level, and this embodiment of the present invention provides a solution that specifically implies following:

[0316] Optionally, if the first characteristic parameter includes a preamble format, the processor 803 is configured to determine that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two levels PRACH extended transmissions are different.

[0317] Optionally, processor 803 is configured to: in the process of determining that the preamble formats associated with at least two levels of an extended PRACH transmission are different, if there are N levels of an extended PRACH transmission, determine that: the first N1 of the advanced transmission levels PRACH in the N levels of the extended PRACH transmission are associated with the first preamble format, and subsequent N-N1 levels of the extended PRACH transmission in the N levels of the extended PRACH transmission are associated with the second preamble format, where N and N1 are positive integers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0318] Optionally, processor 803 is configured to determine that the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0319] Optionally, processor 803 is configured to determine that preamble format 4 is not used for extended PRACH transmission.

[0320] Optionally, the processor 803 is configured to determine that the preamble format associated with the determined information of the PRACH extended transmission level is predetermined; or the transmitter 802 included in the network device is configured to send, to the UE, preamble format configuration information associated with the determined information of the PRACH extended transmission level.

[0321] Optionally, if the first characteristic parameter includes a time-frequency resource, the processor 803 is configured to: determine that the time-frequency resources associated with the first M1 levels of the extended PRACH transmission in M adjacent levels of the extended PRACH transmission include time-frequency resource; and determine that the time-frequency resources associated with the subsequent M-M1 extended PRACH transmission levels in the M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0322] An embodiment of the present invention further provides another terminal. As shown in FIG. 9, for ease of description, only the parts associated with this embodiment of the present invention are illustrated. For specific technical details that are not disclosed, refer to the method part of the embodiments of the present invention. The terminal can be any terminal device, for example, a mobile phone, tablet computer, PDA (Personal Digital Assistant, personal digital assistant), POS (Point of Sales, outlet) or a car computer, for example, the terminal is a mobile phone.

[0323] FIG. 9 shows a block diagram of a partial construction of a mobile phone associated with a terminal provided in this embodiment of the present invention. According to FIG. 9, the mobile phone includes parts such as radio frequency (Radio Frequency, RF) circuit 910, memory 920, input unit 930, display unit 940, sensor 950, audio frequency circuit 960, high-quality wireless module 970 (wireless fidelity, WiFi ), processor 980 and power supply 990. One skilled in the art can understand that the design of the mobile phone shown in FIG. 9, does not impose any restrictions on the mobile phone and may include more or fewer parts than shown in the figure, or a combination of some parts, or parts arranged differently.

[0324] Below, as shown in FIG. 9, each component of a mobile phone is described in detail:

[0325] RF circuit 910 may be configured to receive and send a signal in the process of receiving or sending information or a call process, and in particular, after receiving the downlink information of the base station, sending the information of the downlink to the processor 980 to perform processing; and, in addition, sending the constructed uplink data to the base station. In general, the RF circuit 910 includes, but without limitation, an antenna, at least one amplifier, a transceiver, a splitter, a low-noise amplifier (Low Noise Amplifier, LNA), and a duplexer. In addition, RF circuit 910 may additionally communicate with the network and other device via radio. For the aforementioned radio communication, any standard or communication protocol can be used, including, but not limited to, Global System for Mobile communication (GSM), General Packet Radio Service (GPRS), code-based multiple access. Separation (Code Division Multiple Access, CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution, LTE communication project, Email and Short Message Service (Short Messaging Service, SMS).

[0326] The memory 920 may be configured to store the program and the software module, and the processor 980 executes the program and the software module, which are stored in the memory 920, to perform various functions and applications of the mobile phone and perform data processing. The memory 920 may mainly include a program storage area and a data storage area, and an operating system, an application program necessary to perform at least one function (for example, voice playback or playback functions) may be stored in the program storage area. images), etc., and data storage (for example, audio data and a phone book) created according to the use of a mobile phone, etc. may be stored in the data storage area. In addition, memory 920 may include high speed memory and may further include a nonvolatile memory, for example, at least one storage device based on a magnetic disk, flash memory or other volatile solid-state memory device.

[0327] An input unit 930 may be configured to receive input digital or symbolic information and generate a key input signal associated with user setting and control of a mobile phone function. In particular, the input unit 930 may include a touch pad 931 and another input device 932. The touch panel 931 is also referred to as a touch screen and can register a tactile operation (for example, an operation performed by the user on the touch panel 931 or near the touch panel 931 using any appropriate object or accessory device, such as a finger or stylus) on or near the touch panel 931, and actuate the corresponding connecting device according to a predetermined program. Optionally, the touch panel 931 may include two parts: a touch detection device and a touch controller. The touch detection device detects the user's touch orientation, detects the signal carried by the haptic operation, and transfers the signal to the touch controller. The touch controller receives the touch information from the touch detection device, converts the touch information into contact coordinates, and sends contact coordinates to processor 980, and can receive and execute the command sent by processor 980. In addition, the touch panel 931 can be implemented using multiple types, for example, resistive type, capacitive type, infrared type and surface acoustic wave type. In addition to the touch pad 931, input block 930 may include another input device 932. In particular, another input device 932 may include, but is not limited to, one or more of a physical keyboard, a function key (eg, volume control keys or power keys), a trackball, a mouse, and a joystick.

[0328] Display unit 940 may be configured to display user input or information provided to the user and various mobile phone menus. The display unit 940 may include a display panel 941. Optionally, the display panel 941 may be configured in the form of, for example, a liquid crystal display (Liquid Crystal Display, LCD) or a display on organic light emitting diodes (Organic Light Emitting Diode, OLED). In addition, the touch panel 931 may cover the display panel 941. When a tactile operation is detected on or near the touch panel 931, the touch panel 931 transfers a tactile operation to the processor 980 to determine the type of touch event, and then the processor 980 provides the corresponding visual output on the display panel 941 according to the type of touch event. According to FIG. 9, the touch panel 931 and the display panel 941 are configured as two independent parts for realizing the input and output functions of the mobile phone. However, in some embodiments, the touch panel 931 and the display panel 941 may be combined to implement the input and output functions of the mobile phone.

[0329] The mobile phone may further include at least one sensor 950, for example, a light sensor, a motion sensor, or another sensor. In particular, the light sensor may include an external light sensor and a proximity sensor, and the external light sensor can adjust the brightness of the display panel 941 according to the intensity of the ambient light, and the proximity sensor can turn off the display panel 941 and / or the backlight when the mobile phone is brought to your ear. As a kind of motion sensor, an accelerometer can register acceleration values in different directions (as a whole, along three axes); detect, in a stationary state, the value and direction of gravity; and apply to an application that recognizes the position of the mobile phone (for example, to switch the screen between horizontal orientation and vertical orientation, the corresponding game, and calibrate the position of the magnetometer), the function associated with the recognition of vibration (eg, pedometer and tap), etc. Sensors, such as a gyroscope, barometer, hygrometer, thermometer and infrared sensor, which can also be configured in a mobile phone, are not described again here.

[0330] Audio circuit 960, speaker 961, and microphone 962 can provide an audio interface between the user and the mobile phone. The audio frequency circuit 960 can transmit to the loudspeaker 961 an electrical signal that is obtained after converting the received audio data, and the loudspeaker 961 converts the electrical signal into a sound signal and outputs a sound signal; in another aspect, microphone 962 converts the collected audio signal into an electrical signal, audio frequency circuit 960 receives and converts the electrical signal into audio data and outputs the audio data to processor 980 for processing, and then the audio data is sent, for example, to another mobile phone, using RF circuits 910, or audio data are output to memory 920 for additional processing.

[0331] WiFi refers to short-range wireless technology. The mobile phone can help, using the 970 WiFi module, the user to send and receive email, browse the web, access streaming media, etc. The 970 WiFi module provides wireless broadband Internet access for the user. Although FIG. 9 shows the WiFi module 970, it is obvious that the WiFi module 970 is not an essential part of a mobile phone and, if necessary, can be completely excluded without changing the scope of the essence of the present invention.

[0332] The processor 980 is the control center of a mobile phone and is connected to each part of the entire mobile phone using various interfaces and lines, and implements, by running or executing a program and / or software module that is stored in memory 920 and recalling data stored in memory 920, various mobile phone functions and data processing, for general monitoring on a mobile phone. Optionally, processor 980 may include one or more processing units. Preferably, the application processor and modem processor may be embedded in processor 980, with the application processor mainly processing the operating system, user interface, application program, etc .; and the modem processor basically handles the radio. Obviously, the modem processor described above may also not be embedded in processor 980.

[0333] The mobile phone further includes a power source 990 (eg, a battery) that supplies power to each part. Preferably, the power source may be logically connected to the processor 980 using a power control system, whereby functions such as charge, discharge, and power management are implemented using a power source control system.

[0334] Although not shown, the mobile phone may additionally include a camera, a Bluetooth module, etc., which are not described here again.

[0335] In this embodiment of the present invention, the processor 980 included in the terminal additionally has the following functions:

[0336] The processor 980 is configured to: determine the information of the extended transfer level of the physical random access channel PRACH, and, in this embodiment of the present invention, the information of the level can be any of the level, level index, expansion level, expansion level index, repetition level, level index Repeat, Resource Level, Resource Level Index, Resource Level, Resource Level Index, Resource Level Index and Resource Index; and determine the first characteristic parameter that relates to the extended PRACH transmission and which is associated with the information of the PRACH extended transmission level, and in this embodiment of the present invention, the first characteristic parameter may be at least one of the transmitted power, the preamble format and time-frequency resource. RF circuit 910 or WiFi module 970 is configured to perform an extended send of the PRACH according to the first characteristic parameter.

[0337] This embodiment of the present invention is applied to an LTE or LTE-A system with enhanced coverage, and there are multiple repeat levels of an extended PRACH transmission, for example, levels 1, 2, and 3 of a repeat of an extended PRACH transmission. Index numbering can be performed at multiple levels of repetition, i.e., repetition level indices. In another mode, there are multiple levels or multiple expansion levels of the extended PRACH transmission, and the index is numbered at multiple levels, i.e. level indexes, or the index is numbered at multiple extension levels, i.e. extension level indexes. The PRACH extended transmission level information is any of a level, a level index, an extension level, an extension level index, a repetition level, and a repetition level index.

[0338] For each level of the extended PRACH transmission, the number of repetitions to send the preamble from the UE and the set of PRACH extended transmission resources that correspond to each level of the extended PRACH transmission are indicated by the system or signaled. The PRACH extended transmission resource set includes one or more PRACH extended transmission resources. The resources of the extended PRACH transmission include a code resource (preamble), a time resource and a frequency resource, which are used to send the preamble. The time resource and the frequency resource may be collectively referred to as a time-frequency resource. If the UE determines the information of the PRACH extended transmission level, the UE re-sends, according to the number of repetitions corresponding to the determined information of the PRACH extended transmission level, a preamble on a resource that belongs to the PRACH extended transmission and that is included in the PRACH extended transmission resource set. For different information of the level of the extended PRACH transmission, the number of repetitions for sending a preamble with a UE is different. As the required expansion of the system coverage increases, the path loss between the UE and the base station also increases, the level information that relates to the extended PRACH transmission that is used by the UE to successfully complete the random access process also increases, and the number of repetitions to send the preamble increases. Since there are multiple levels of the extended PRACH transmission, there are also multiple sets of resources of the extended PRACH transmission, and multiple sets of resources are used on the UE to send the preamble according to different repetition numbers. The PRACH resource set may be referred to as the PRACH extended transmission resource set level, and one or more PRACH extended transmission resources that are included in one PRACH extended transmission resource set may be collectively referred to as the PRACH extended transmission resource level, and the index numbering is separately resource set, resource set level, resource and resource level that are related to the PRACH extended transfer, i.e. resource set index, resource set level index, resource index and resource level index related to extended PRACH transmission. Information of the advanced PRACH transmission level may also be any of the resource level, resource level index, resource set level, resource set level index, resource set index and resource index. The index numbering is performed on the number of repetitions for sending the preamble from the UE, i.e. the index of the number of repetitions. The PRACH extended transmission level information may also be one of a repetition number and a repetition index.

[0339] In this embodiment of the present invention, the first characteristic parameter is associated with the level information, and the characteristic parameter used for the extended PRACH send can be quickly and accurately determined, which reduces the power of the terminal.

[0340] Based on three specific optional parameters included in the first characteristic parameter, this embodiment of the present invention provides the following four solutions, in particular the following:

[0341] 1. Optionally, the first characteristic parameter includes the transmitted power; and

processor 980 is configured to determine the transmit power of the extended PRACH transmission according to the second characteristic parameter corresponding to the information of the advanced PRACH transmission level, the second characteristic parameter being at least one of the initial received target preamble power, the number of preamble transmission attempts path loss thresholds, ramp voltage adjustment steps, power offset values associated with the preamble format, and s Achen power offset associated with the information transfer level extended PRACH.

[0342] Optionally, the processor 980 is configured to determine the transmit power of the extended PRACH transmission according to the second characteristic parameter corresponding to the information of the extended PRACH transmission level, and the second characteristic parameters corresponding to different information of the advanced PRACH transmission level are completely identical, or partially identical, or completely different .

[0343] Optionally, the processor 980 is configured to determine, according to the third characteristic parameter, the corresponding level information that relates to the PRACH extended transmission, and which is one level lower than the PRACH advanced transmission level information, and included in the second characteristic parameter corresponds to the level information of the extended PRACH transmission, with the third characteristic parameter being at least one of the initial received target m the preamble power, the step of adjusting the power with a linearly varying voltage, the fixed value of the power offset and the maximum number of attempts to transmit the preamble.

[0344] Optionally, the second characteristic parameter includes the initial received target power of the preamble; and

processor 980 is configured to: if the PRACH extended transmission level information is not the first PRACH extended transmission level, determine that: the initial received target preamble power corresponding to the information of the extended PRACH transmission level is equal to the sum of the initial received target preamble power and the power control step linearly varying voltage, which correspond to the level information that is related to the extended PRACH transmission, and which is one level lower than the extended level information PRACH cottages, or the initial received preamble target power corresponding to the PRACH extended transmission level information, is a fixed power offset value plus the sum of the initial received preamble target power and the power control step with linearly varying voltage, which correspond to the level information that relates to the extended PRACH transmission, and which is one level lower than the PRACH extended transmission level information; or

if the information of the PRACH extended transmission level is the first level of the PRACH extended transmission, determine that: the initial received target preamble power corresponding to the information of the extended PRACH transmission level is the initial received preamble target power configured by the network device or the initial received preamble target power corresponding to the information PRACH extended transmission level is equal to the sum of the initial received target power of the preamble and the step of adjusting the power of the linearly varying voltage that correspond to the transmission PRACH, the initial or accepted target preamble power corresponding to the transmission level information extended PRACH, a fixed power offset value plus the sum of the received preamble initial target power and the power control step of linearly changing voltage which correspond to the transmission PRACH.

[0345] Optionally, the second characteristic parameter includes the number of attempts to transmit the preamble; and

processor 980 is configured to: set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the level information that relates to the extended PRACH transmission and which is one level lower than the information PRACH extended transmission level; or set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1; or set the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level to 1 plus the maximum number of preamble transmission attempts corresponding to the PRACH transmission.

[0346] Optionally, the second characteristic parameter includes path loss or threshold path loss; and

processor 980 is configured to: set path loss corresponding to the information of the PRACH extended transmission level equal to the lowest path loss to determine the PRACH extended transmission level information; or set the path loss threshold corresponding to the information of the PRACH extended transmission level equal to the smallest path loss threshold to determine the information of the PRACH extended transmission level.

[0347] Optionally, the second characteristic parameter includes a power offset value associated with the PRACH extended transmission level information; and

processor 980 is configured to: set a power offset value associated with the PRACH extended transmission level information equal to the difference between the highest path loss or threshold path loss to determine the PRACH extended transmission level information and path loss estimated by the UE; or set the power offset value associated with the PRACH extended transmission level information equal to the difference between the sum of the smallest path loss or threshold path loss to determine the first PRACH extended transmission level and the product obtained by multiplying the PRACH extended transmission level information , to determine the level information of the extended PRACH transmission, and path loss estimated by the UE.

[0348] Optionally, processor 980 is further configured to: if the PRACH extended transmission level information is not the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the sum of the difference between the initial number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level, and 1, and the number of available preamble transmission attempts corresponding to the level information PRACH extended transmission, increase the PRACH extended transmission level information by one level; or if the PRACH extended transmission level information is not the highest PRACH extended transmission level information when the number of preamble transmission attempts corresponding to the PRACH extended transmission level information is equal to the number of available preamble transmission attempts corresponding to the PRACH extended transmission level information on one level; or if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the sum of the difference between the initial value of the number of preamble transmission attempts corresponding to the information of the PRACH extended transmission level information, and 1, and the number of available attempts to transmit the preamble, the corresponding information of the PRACH extended transmission level, to carry out the operation of postponing the transmission and attempt to retransmit the preamble starting with the lowest information of the PRACH extended transmission level, or perform a postpone operation and attempt to retransmit the preamble, storing the PRACH extended transmission level information as the highest information of the PRACH advanced transmission level, or Notify a higher level of unsuccessful extended random access attempts or if the information of the PRACH extended transmission level is the highest information of the PRACH extended transmission level, when the number of preamble transmission attempts corresponding to the information of the extended PRACH transmission level is equal to the number of available preamble transmission attempts corresponding to the PRACH advanced transmission level information, perform a postponing operation and attempt re-send the preamble starting at the lowest information level of the extended PRACH transmission, or perform a postpone operation I transmit and try to retransmit the preamble, saving the PRACH extended transmission level information as the highest PRACH advanced transfer level information, or adjust the delay parameter of the transmission, or notify a higher level of an unsuccessful extended random access attempt.

[0349] In addition, processor 980 is further configured to determine that: the quantities that relate to the available attempts at transmitting the preamble and which correspond to all the information of the extended PRACH transmission level are the same, or the quantities that are related to the available attempts at transmitting the preamble, which correspond at least At least two levels of extended PRACH transmission are different.

[0350] Optionally, processor 980 is configured to determine that: the number of available preamble transmission attempts corresponding to the PRACH advanced transmission level information is configured by the network device, or the number of available preamble transmission attempts corresponding to the PRACH advanced transmission level information, or the number of available the preamble transmission attempts corresponding to the information of the PRACH extended transmission level is determined according to a predetermined rule.

[0351] 2. Optionally, if the first characteristic parameter includes the transmitted power,

processor 980 is configured to: if the information of the extended PRACH transmission level is the nth extended PRACH transmission level, determine that: the transmitted power of the extended PRACH transmission is the maximum transmit power of the UE, or the transmitted power of the advanced PRACH transmission is PRACH extended transmission, where n is a positive integer.

[0352] Optionally, processor 980 is configured to: determine the value of the allocated power of the PRACH extended transmission level information according to a predefined value; or determine the value of the allocated power of the PRACH extended transmission level information according to the configuration implemented by the network device.

[0353] Optionally, processor 980 is configured to determine that the values of the allocated power of at least two levels of the extended PRACH transmission in the values of the allocated power of the information of the level of the extended PRACH transmission are different.

[0354] 3. Optionally, if the first characteristic parameter includes a preamble format,

processor 980 is configured to determine that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least two PRACH extended transmission levels are different.

[0355] Optionally, processor 980 is configured to: in the process of determining that the preamble formats associated with at least two levels of an extended PRACH transmission are different, if there are N levels of an extended PRACH transmission, determine that: the first N1 advanced transmission levels PRACH in the N levels of the extended PRACH transmission are associated with the first preamble format, and subsequent N-N1 levels of the extended PRACH transmission in the N levels of the extended PRACH transmission are associated with the second preamble format, where N and N1 are positive integers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0356] Optionally, processor 980 is configured to determine that the first preamble format and the second preamble format are preamble formats in preamble format 1 and preamble format 3.

[0357] Optionally, processor 980 is configured to determine that preamble format 4 is not used for extended PRACH transmission.

[0358] Optionally, processor 980 is configured to determine that: the used preamble format associated with the determined information of the PRACH extended transmission level is predefined, or the preamble format associated with the specific information of the advanced PRACH transmission level is configured by the network device.

[0359] 4. Optionally, the first characteristic parameter includes a time-frequency resource; and

processor 980 is configured to: determine that the time-frequency resources associated with the first M1 levels of the extended PRACH transmission in the M neighboring levels of the extended PRACH transmission include a first time-frequency resource; and determine that the time-frequency resources associated with the subsequent M-M1 extended PRACH transmission levels in the M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0360] An embodiment of the present invention further provides another network device, and the network device may be a base station. As shown in FIG. 10, the network device includes: an interface transfer unit 1001, a main processing control unit 1002, a baseband processing unit 1003, an radio frequency processing unit 1004, and a radio frequency antenna feeder 1005.

[0361] The baseband processing unit 1003 is configured to determine a first characteristic parameter that relates to the extended PRACH transmission and which is associated with the advanced transmission level information of the physical random access channel PRACH.

[0362] In this embodiment of the present invention, the first characteristic parameter may be at least one of a preamble format and a time-frequency resource.

[0363] The radio frequency antenna feeder 1005 is configured to perform the extended reception of the PRACH according to the first characteristic parameter, which is associated with all the information of the extended PRACH transmission level and which is determined by the baseband processing unit 1003.

[0364] Optionally, as shown in FIG. 10, the network device further includes:

RF antenna feeder 1005, configured to: Before RF antenna antenna 1005 performs an extended PRACH reception according to the first characteristic parameter associated with all the information of the PRACH extended transmission level, send to the UE at least one of the following configuration information: the initial received target power of the preamble, the number of available preamble transmission attempts, the corresponding information of the PRACH extended transmission level, and the value of the allocated power of the level information PRACH extended transmission, which allows the UE to determine, according to the configuration information, the transmitted power that relates to the extended PRACH transmission and which is associated with the PRACH extended transmission level information, or increase the information of the extended PRACH transmission level by one level, or perform a postpone transfer operation and implement attempt to resend the preamble, starting with the lowest information of the level of the extended PRACH transmission, or perform a postponing operation and attempt to retry sending the preamble, storing the information of the PRACH extended transmission level as the highest information of the PRACH extended transmission level, or adjusting the transfer delay parameter, or notify a higher level of an unsuccessful extended random access attempt.

[0365] Optionally, the baseband processing unit 1003 is configured to determine that: the quantities that relate to the available preamble transmission attempts and which correspond to all the information of the extended PRACH transmission level are the same, or the quantities that belong to the available preamble transmission attempts and that correspond to at least two levels of the extended PRACH transmission are different.

[0366] Optionally, the baseband processing unit 1003 is configured to determine that the values of the allocated power of at least two levels of the extended PRACH transmission are all different in all the information of the extended PRACH transmission level.

[0367] Based on various optional parameters of the first characteristic parameter, there may be various solutions for determining the first characteristic parameter that relates to the extended PRACH transmission and which is associated with the information of the advanced PRACH transmission level, and this embodiment of the present invention provides a solution that specifically implies following:

[0368] Optionally, if the first characteristic parameter includes a preamble format, the baseband processing unit 1003 is configured to determine that: the preamble formats associated with all the information of the PRACH extended transmission level are the same, or the preamble formats associated with at least The two levels of the extended PRACH transmission are different.

[0369] Optionally, the baseband processing unit 1003 is configured to: in the process of determining that the preamble formats associated with at least two levels of the extended PRACH transmission are different, if there are N levels of the extended PRACH transmission, determine that: the first N1 PRACH Extended Transmission Levels in N Extended PRACH Transmission Levels are associated with the first preamble format, and subsequent N-N1 Extended PRACH Transmission Levels in N Extended PRACH Transfer Levels are associated with the second preamble format, where N and N1 are positive The left numbers, N1 is less than N, and the first preamble format and the second preamble format are different.

[0370] Optionally, the baseband processing unit 1003 is configured to determine that the first preamble format and the second preamble format are preamble format 1 and preamble format 3.

[0371] Optionally, the baseband processing unit 1003 is configured to determine that preamble format 4 is not used for the extended PRACH transmission.

[0372] Optionally, the baseband processing unit 1003 is configured to determine that the preamble format associated with the determined information of the PRACH extended transmission level is predetermined; or the radio frequency antenna feeder 1005 included in the network device is configured to send, to the UE, the preamble format configuration information associated with the determined information of the PRACH extended transmission level.

[0373] Optionally, if the first characteristic parameter includes a time-frequency resource, the baseband processing unit 1003 is configured to: determine that the time-frequency resources associated with the first M1 levels of the extended PRACH transmission in M neighboring levels of the extended PRACH transmission include in the first time-frequency resource; and determine that the time-frequency resources associated with the subsequent M-M1 extended PRACH transmission levels in the M adjacent PRACH extended transmission levels include a second time-frequency resource, the first time-frequency resource and the second time-frequency resource being different time-frequency resources, M and M1 are positive integers, and M1 is less than or equal to M.

[0374] An embodiment of the present invention further provides a solution in which the receiving half-duplex frequency division duplexing device (HD-FDD, Half-Duplex Frequency Division Duplex) transmits frame data, which, in particular, implies the following:

[0375] For a frequency division full duplex receiver (HD-FDD, Half-Duplex Frequency Division Duplex), when the receiver switches from the downlink subframe to the uplink subframe or switches from the uplink subframe to the downlink subframe, due to problems such as turning on / off the frequency generator, linear increase in generator power, and propagation delay between the network device and the receiving device, a phenomenon occurs in which Ack in the uplink subframe overlaps with the reception in the downlink subframe adjacent to the uplink subframe, and therefore, during overlapping, the receiver cannot receive data that occupies the entire downlink subframe, or cannot send data that occupy the entire uplink subframe. In this embodiment, the behavior of the receiving device and / or the network device is indicated to allow the reception and sending of data when the sending in the uplink subframe overlaps with the reception in the downlink subframe.

[0376] FIG. 11, four rows of subframes are shown from top to bottom, respectively: a downlink subframe for sending data by a network device, a downlink subframe of a receiving device, an uplink subframe of a receiving device, and an uplink subframe for receiving data by a network device.

[0377] FIG. 12, four rows of subframes are shown from top to bottom, respectively: a downlink subframe for sending data by a network device, a downlink subframe of a receiving device, an uplink subframe of a receiving device, and an uplink subframe for receiving data by the network device.

[0378] FIG. 11 and FIG. 12 shows the time to skip sending the data, which is on the uplink subframe, the delay in propagating the downlink and the delay in propagating uplink; another parameter is described in detail in the following embodiment.

[0379] For a frequency division full duplex receiving device (HD-FDD, Half-Duplex Frequency Division Duplex), when the receiving device switches from the downlink subframe (eg, the downlink subframe # 1 of the receiving device in FIG. 11) to the adjacent subframe uplink (for example, an uplink subframe # 2 of the receiving device in FIG. 11), due to factors such as on / off adjustment of the operating frequency by the frequency generator, and propagation delay m waiting for the network device and the receiving device, the receiving device should stop receiving data in the last part of the downlink subframe (for example, downlink subframe # 1 of the receiving device in Fig. 11), and preparing to send data uplink subframe (for example, uplink # 2 receiving device in Fig. 11). The last part, which refers to the downlink subframe (for example, the downlink subframe # 1 of the receiving device in FIG. 11) and in which the receiving operation is not performed, is referred to as a guard interval. The guard interval is determined by such factors as the time to adjust the operating frequency of the frequency generator and the propagation delay between the network device and the receiving device. For example, in FIG. 11, the guard interval for switching from the downstream subframe # 1 of the receiving device to the uplink subframe # 2 of the receiving device is equal to the sum of the time for adjusting the operating frequency by the frequency generator and the two-way propagation delay on the uplink and downlink.

[0380] Time to adjust the operating frequency of the frequency generator includes the on / off time of the frequency generator and the time of the linear increase in the power of the frequency generator. In the FDD system, the signal is received and the signal is sent using two different frequency bands. When a half-duplex FDD receiver does not have a frequency duplexer and only has a frequency generator, the process in which the receiver switches from receiving a signal to sending a signal or switches from sending a signal to receiving a signal, the frequency generator needs to adjust the operating frequency of the frequency generator to perform receive switching send or send / receive signal. To adjust the operating frequency of the frequency generator, the frequency generator, in general, must first turn off the current frequency generator, and then restart the frequency generator to adjust the frequency generator to the desired frequency. After restarting the frequency generator, a linear increase in power is also required. As an example of a linear increase in the power of the frequency generator, the time of a linear increase in the power of the frequency generator can be a transition period (Transient period), that is, it takes the entire time of 20 µs to reach the required threshold after starting the frequency generator.

[0381] The propagation delay between the network device and the receiving device means the time required for the downlink data to travel along the path from the network device to the receiving device and / or the time required for the uplink data to propagate up the path from the receiving device to the network device. For example, a two-way propagation delay on the uplink and downlink in FIG. 11 and FIG. 12 means the sum of the propagation time from the network device to the receiving device and the propagation time along the path from the receiving device to the network device.

[0382] Similarly, when the receiving device switches from the uplink subframe (for example, the uplink subframe # 4 of the receiving device in FIG. 11) to the next downlink subframe (for example, the downlink subframe # 5 of the receiving device in Fig. 11), the receiving device skips sending data in a guard interval in the last part of the uplink subframe (for example, uplink subframe # 4 of the receiving device in FIG. 11), and is prepared to receive data from the downstream frame dyaschey link (e.g., downlink subframe # 5 of the receiving apparatus in FIG. 11). Alternatively, the receiving device completes sending the uplink subframe data (for example, the uplink subframe # 4 of the receiving device in FIG. 12), but skips receiving the downlink data in a guard interval in the first part of the downlink subframe (for example, downlink subframe communication line # 5 receiver in Fig. 12). The guard interval is determined by such factors as the time to adjust the operating frequency of the frequency generator and the propagation delay between the network device and the receiving device. For example, in FIG. 11 and FIG. 12, the guard interval of the receiving device that switches from the uplink subframe # 4 to the downlink subframe # 5 is equal to the difference between the time for adjusting the operating frequency by the frequency generator and the two-way propagation delay on the uplink and downlink.

[0383] Optionally, the network device skips sending the downlink data to the receiving device in the first downlink subframe (eg, downlink subframe 1 of the receiving device in FIG. 11) preceding the uplink subframe (eg, uplink subframe 2 11), and / or the network device skips sending downlink data to the receiving device in the first downlink subframe (for example, a downlink subframe th link 5 of the receiving apparatus in FIG. 12) following the uplink subframe (e.g., subframe, an uplink receiving unit 4 of FIG. 12).

[0384] In conclusion, an embodiment of the present invention provides a solution for transmitting frame data, including:

when the receiving device frequency division duplex half-duplex (HD-FDD) switches from the uplink subframe to the downlink subframe, the reception, by the receiving device, skips the data in the guard interval in the first part of the downlink subframe the interval in the last part of the uplink subframe, and the guard interval is determined by factors such as the time to adjust the operating frequency by the frequency generator and / or the delay by two-way e spread on the uplink and downlink. Optionally, in accordance with the receiving device of frequency duplex half-duplex communication (HD-FDD), the network device skips sending downlink data to the receiving device in the first subframe preceding the uplink subframe and / or the network device skips sending data downlink to the receiving device in the first downlink subframe following the uplink subframe.

[0385] An embodiment of the present invention provides a device configured as a receiving device for half-duplex communication with frequency division, as shown in FIG. 13, including:

a control unit 1301, configured to: when the receiving device switches from the uplink subframe to the downlink subframe, control the receiving device to skip receiving data in the guard interval in the first part of the downlink subframe, or to skip sending data in the guard interval in the last part of the uplink subframe.

[0386] In the above solution, when switching from an uplink subframe to a downlink subframe, the receiving device skips receiving data in the guard interval in the first part of the downlink subframe, or skips sending data in the guard interval in the last part of the uplink subframe.

[0387] Optionally, as shown in FIG. 14, the control unit 1301 includes:

a guard interval determination unit 1401, configured to determine a guard interval according to a time for adjusting an operating frequency by a frequency generator and / or a two-way propagation delay in the uplink and downlink.

[0388] An embodiment of the present invention provides a network device, as shown in FIG. 15, including:

sending control unit 1501, configured to: control a network device to skip sending downlink data to a receiving half-duplex duplex communication device with frequency division in the first subframe preceding the uplink subframe, and / or controlling the network device to skip sending downlink data communication to the receiving half-duplex frequency division duplexing device in the first downlink subframe following the uplink subframe communication lines.

[0389] In the solution described above, the network device skips sending downlink data to the receiving half-duplex unit with frequency division in the first subframe preceding the uplink subframe and / or skips sending the downlink data to the receiving half-duplex unit with frequency division in the first downlink subframe next to the uplink subframe, which allows to avoid overlap between sending in the subframe odyaschey link and a reception in the downlink subframe.

[0390] An embodiment of the present invention provides a method for transmitting frame data, as shown in FIG. 16, comprising the following steps:

[0391] 1601. A frequency division duplexed receiving device switches from an uplink subframe to a downlink subframe.

[0392] 1602. When the receiving frequency division duplexed half duplex device switches from an uplink subframe to a downlink subframe, the receiving device skips receiving data in the guard interval in the first part of the downlink subframe, or skips sending data in the guard interval in the last part of the subframe uplink

[0393] In the above solution, when switching from an uplink subframe to a downlink subframe, the receiving device skips receiving data in the guard interval in the first part of the downlink subframe, or skips sending data in the guard interval in the last part of the uplink subframe, allows to avoid overlap between sending in uplink subframe and receiving in downlink subframe.

[0394] Optionally, the guard interval is determined using the time to adjust the operating frequency by the frequency generator and / or the two-way propagation delay on the uplink and downlink.

[0395] An embodiment of the present invention further provides another method for transmitting frame data, as shown in FIG. 17, comprising the following steps:

[0396] 1701. The network device determines the downlink data to be sent.

[0397] 1702. The network device transmits the downlink data to the receiving half-duplex unit with frequency division in the first subframe preceding the uplink subframe, and / or the network device passes the downlink data to the receiving half-duplex duplex unit with the frequency division in the first downlink subframe following the uplink subframe.

[0398] In the solution described above, the network device skips sending downlink data to the receiving half-duplex unit with frequency division in the first subframe preceding the uplink subframe and / or skips sending the downlink data to the receiving half-duplex unit with frequency division in the first downlink subframe next to the uplink subframe, which allows to avoid overlap between sending in the subframe odyaschey link and a reception in the downlink subframe.

[0399] An embodiment of the present invention further provides another device configured as a receiving device for frequency division half duplex communication, as shown in FIG. 18, including: a receiver 1801, a transmitter 1802, a processor 1803, and a memory 1804, the processor 1803 being configured to: when the receiving device switches from an uplink subframe to a downlink subframe, skip receiving data in a guard interval in the first part of the subframe downlink, or skip sending data in a guard interval in the last part of the uplink subframe.

[0400] In the above solution, when switching from an uplink subframe to a downlink subframe, the receiving device is controlled to skip receiving data in a guard interval in the first part of the downlink subframe, or to skip sending data in a guard interval in the last part of the uplink subframe communication, which avoids overlap between sending in the uplink subframe and receiving in the downlink subframe.

[0401] Optionally, the processor 1803 is configured to determine a guard interval using time to adjust the operating frequency with a frequency generator and / or a two-way propagation delay in the uplink and downlink.

[0402] An embodiment of the present invention further provides another network device, as shown in FIG. 19, including: a receiver 1901, a transmitter 1902, a processor 1903, and a memory 1904, wherein the processor 1903 is configured to: control a network device to skip sending downlink data to a receiving half duplex full frequency duplex receiver in the first subframe uplink, and / or control the network device to skip sending downlink data to the receiving device half-duplex duplex communication with frequency division in the first subframe downlink following the uplink subframe. In the solution described above, the network device skips sending downlink data to the receiving half-duplex unit with frequency division in the first subframe preceding the uplink subframe and / or skips sending the downlink data to the receiving half-duplex unit with frequency division in the first downlink subframe next to the uplink subframe, which allows to avoid overlap between sending in the subframe odyaschey link and a reception in the downlink subframe.

[0403] It should be noted that the division of the device is only a division of logical functions, but the present invention is not limited to the above-mentioned division, provided that the corresponding functions can be implemented. In addition, specific functional block names are provided only for the purpose of distinguishing blocks, but not intended to limit the scope of protection of the present invention.

[0404] In addition, the person skilled in the art can understand that the steps of the method embodiments may be implemented, in whole or in part, by a program controlling the respective equipment. The program can be stored on a computer-readable storage medium. The storage medium may include: read-only memory, magnetic disk, or optical disk.

[0405] The above descriptions are only illustrative embodiments of the present invention, but are not intended to limit the scope of protection of the present invention. Any changes or substitutions proposed by a person skilled in the art in the technical scope disclosed in the embodiments of the present invention shall be included in the protection scope of the present invention. Thus, the protection scope of the present invention is determined by the protection scope of the claims.

Claims (32)

1. A terminal containing: a processing unit configured to determine the information of the extended transmission level of the physical random access channel PRACH and determine the transmitted power of the extended transmission PRACH, the transmitted power is set to the maximum transmitted power when the information of the extended transmission level of the PRACH is the highest level and the maximum transmitted power is the maximum transmit power configured for said terminal; and a sending unit, configured to perform an extended PRACH transmission in accordance with the transmitted power. 2. The terminal of claim 1, wherein the processing unit is further configured to determine the transmit power of the PRACH extended transmission in accordance with a characteristic parameter corresponding to the information of the PRACH extended transmission level, the characteristic parameter is at least one of the initial received target preamble power, the number of attempts to transmit the preamble, path loss, threshold path loss, power control step by linearly varying voltage, power offset values, s yazannogo preamble format, and power offset values associated with the information transfer level extended PRACH. 3. The terminal of claim 1, wherein the processing unit is further configured to if the information of the PRACH extended transmission level is not the highest level, and the number of preamble transmission attempts corresponding to the level information is equal to the maximum number of attempts corresponding to the level information, increasing the level information of the extended PRACH transmission by one level; or executing the postponing operation and attempting to resend the preamble, remaining at the highest level if the information of the PRACH extended transmission level is the highest level and the number of preamble transmission attempts corresponding to the level information is equal to the maximum number of attempts corresponding to the level information. 4. The terminal according to claim 3, wherein the processing unit is further configured to determine that the maximum number of attempts corresponding to the level information is configured by the network device, or the maximum number of retries corresponding to the PRACH extended transmission level information is predefined, or the maximum number of attempts corresponding to the information of the PRACH extended transmission level is determined in accordance with a predetermined rule. 5. The terminal of claim 1, wherein the processing unit is further configured to determine the format of the preamble of the extended PRACH transmission. 6. The terminal according to claim 5, in which the processing unit is further configured to determine that preamble format 4 is not used for the extended PRACH transmission. 7. Method for enhanced transmission of a physical random access channel, comprising: determine the information level of the extended transmission of the physical random access channel PRACH; determine the transmitted power of the extended transmission PRACH, and the transmitted power is set to the maximum transmitted power when the determined information of the advanced transmission level of the PRACH is the highest level three, and the maximum transmitted power is the maximum value of the transmitted power configured for the terminal; and perform an extended PRACH transmission in accordance with the transmitted power. 8. The method according to claim 7, wherein the method further comprises a stage on which: determine the transmitted power of the extended PRACH transmission in accordance with a characteristic parameter corresponding to the information of the advanced PRACH transmission level, the characteristic parameter being at least one of the initial received target preamble power, the number of preamble transmission attempts, path loss, threshold path loss, adjustment step ramp voltage, power offset values associated with the preamble format, and power offset values associated with the information level of extended PRACH transmission. 9. The method according to claim 7, whereby the method further comprises the steps of: if the PRACH extended transmission level information is not the highest level and the number of preamble transmission attempts corresponding to the level information is equal to the maximum number of attempts corresponding to the level information, increase the PRACH extended transmission level information by one level; or perform a postpone transfer operation and attempt to retransmit the preamble while remaining at the highest level if the PRACH extended transmission level information is the highest level and the number of preamble transmission attempts corresponding to the level information is equal to the maximum number of attempts corresponding to the level information. 10. The method according to claim 9, further comprising determining that the maximum number of attempts corresponding to the level information is configured by the network device, or the maximum number of retries corresponding to the PRACH extended transmission level information is predefined, or the maximum number of attempts corresponding to the information of the PRACH extended transmission level is determined in accordance with a predetermined rule. 11. The method according to claim 7, further comprising: definition of the preamble format of the extended PRACH transmission. 12. The method according to claim 11, in which the preamble format 4 is not used for the extended PRACH transmission. 13. A non-temporary computer-readable storage medium containing instructions that, when executed by a computer, cause the computer to perform the steps of the method in accordance with any one of claims. 7-12. 14. An apparatus for performing an enhanced transmission of a physical random access channel, comprising at least one storage for storing code and at least one processor for implementing code stored in said storage, which, when executed, executes the method in accordance with any one of claims. 7-12.

Images