WO2014067331A1 - Method and device for transmitting and receiving random access channel - Google Patents

Abstract

Embodiments of the present invention disclose a method and a device for transmitting and receiving a random access channel PRACH, and relate to the field of wireless communications, so as to enhance the coverage of the PRACH. In the present invention, a user equipment transmits a PRACH signal over uplink subframes comprised in N uplink subframe groups, N being an integer greater than 1, and each uplink subframe group comprising one uplink subframe or multiple continuous uplink subframes. Therefore, compared with the prior art, the duration of a PRACH signal transmitted in the solution is longer, thereby improving the signal transmission gain and enhancing the coverage of the PRACH.

Description

 Method and device for transmitting and receiving random access channel The present application claims to be submitted to the Chinese Patent Office on November 2, 2012, the application number is 201210433951.9, and the invention name is "random access channel transmission and reception method and device" Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

 The present invention relates to the field of wireless communications, and in particular, to a method and device for transmitting and receiving a random access channel. Background technique

 IoT technology is on the rise, and it needs to support Machine Type Communications (MTC) in third-generation mobile communication systems and Long Term Evolution (LTE). An MTC device (ie, MTC user device) may have some of the characteristics of a variety of Machine to Machine (M2M) communication features, such as low mobility, small amount of transmitted data, and insensitivity to communication delays. Very low power consumption and other features. In the existing M2M network based on Global System for Mobile Communications (GSM) technology, operators find user equipment working in some scenarios, such as user equipment working in the basement, shopping mall or building corner, due to wireless The signal is severely occluded and the signal is greatly attenuated. The user equipment cannot communicate with the network. The deep coverage of the network in these scenarios will greatly increase the network construction cost, including increasing equipment expenditure, network planning cost, and increase. With the evolution of the wireless communication technology, the M2M service will be deployed in the LTE network. Therefore, the operator hopes to effectively increase the coverage of the network in the subsequent LTE-based wireless communication technology, and solve the problem in the above scenario. User device coverage issues.

 According to the preliminary comparison evaluation, the coverage of the LTE system and the GSM system are equivalent. In order to compensate for the coverage problem in the above scenario, the coverage performance of the existing LTE network needs to be improved. According to the test results of the operators, the coverage needs to be increased by 20 dB compared to the coverage of the existing LTE network.

 Based on the requirements of the above-mentioned operators, the physical channel in the LTE system needs to be covered and enhanced. The physical random access channel (PRACH) is a physical channel with better coverage, but it cannot be satisfied. The above requirements, the following specific analysis.

 As a new communication concept, M2M communication aims to combine various different types of communication technologies, such as: machine-to-machine communication, machine control communication, human-computer interaction communication, mobile interconnection communication, thereby promoting social production and life. The development of the way. It is expected that the business of human-to-human communication may only account for 1/3 of the entire user equipment market, and a larger number of communications is inter-machine (small bandwidth system) communication services.

The current mobile communication network is designed for the communication characteristics between people, such as: determinism of network capacity Wait. If you want to use mobile communication networks to support small-bandwidth system communication, you need to optimize the mechanism of the mobile communication system according to the characteristics of small-bandwidth system communication, so that it can be used in the case of traditional human-to-human communication is not affected or less affected. Under, better communication of small bandwidth systems.

 Some features that may be present in the currently recognized MTC communication are: MTC user equipment has low mobility; the time for data transmission between the MTC user equipment and the network side is controllable, that is, the MTC user equipment can only be within the time period specified by the network. Access is made; the data transmission performed by the MTC user equipment and the network side does not require real-time performance, that is: time tolerance; MTC user equipment energy is limited, requiring extremely low power consumption; between the MTC user equipment and the network side Only small amount of information is transmitted; MTC user equipment can be managed in groups; and so on. An actual MTC user equipment may have one or more of the above characteristics.

 The PRACH is used to carry the transmission of the random access preamble (Preamble) sequence, and the base station establishes uplink synchronization by detecting the Preamble sequence and subsequent signaling exchange.

 In the LTE system, the basic structure of the PRACH signal transmitted on the PRACH is as shown in FIG. 1. The main function of the Cyclic Prefix (CP) is to ensure that the receiving end can perform frequency domain detection and resist interference between symbols; CP uses cyclically shifted Zadoff-Chu sequence; when performing Preamble sequence transmission, Uplink synchronization has not yet been established, so Guard Time (GT) needs to be reserved after the Preamble sequence to avoid interference with other users.

 The reserved GT needs to support the transmission distance to be twice the radius of the cell. This is because the user equipment does not know the distance between itself and the base station when transmitting the Preamble sequence. The size of the GT must ensure that the user equipment at the cell edge obtains the downlink frame timing. After that, there can be enough time to send in advance, as shown in Figure 2a (inter-cell user) and Figure 2b (cell edge user).

 In summary, the existing methods mainly have the following disadvantages:

 The preamble sequence has a short duration and limited gain, which does not meet the coverage requirements. Summary of the invention

 Embodiments of the present invention provide a method and a device for transmitting and receiving a random access channel, which are used to enhance PRACH.

^.

 A method for transmitting a random access channel PRACH, the method comprising:

 The user equipment determines an initial transmission time of the PRACH signal;

 The user equipment transmits the PRACH signal on the uplink subframe included in the N uplink subframe groups, starting from the initial transmission time;

Where N is an integer greater than 1, and each uplink subframe group includes an uplink for transmitting a PRACH signal. A frame or a plurality of consecutive uplink subframes.

 A method for receiving a random access channel PRACH, the method comprising:

 The network side determines an initial sending time of the PRACH signal sent by the user equipment;

 The network side receives the PRACH signal sent by the user equipment in the uplink subframe included in the N uplink subframe groups, starting from the initial transmission time;

 N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes configured by the network side for transmitting the PRACH signal.

 A user equipment, the user equipment comprising:

 a determining unit, configured to determine a starting transmission time of the PRACH signal;

 a transmitting unit, configured to upload a PRACH signal in an uplink subframe included in the N uplink subframe groups, starting from the initial transmission time;

 Where N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes for transmitting the PRACH signal.

 A base station, the base station comprising:

 a determining unit, configured to determine a start sending time of the PRACH signal sent by the user equipment;

 a receiving unit, configured to receive, according to the initial sending time, a PRACH signal sent by the user equipment in an uplink subframe included in the N uplink subframe groups;

 N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes configured by the network side for transmitting the PRACH signal.

 In the solution provided by the embodiment of the present invention, the user equipment transmits on the uplink subframe included in the N uplink subframe groups.

The PRACH signal, where N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes. It can be seen that the PRACH signal transmitted in the scheme continues compared with the prior art. The longer time, which increases the signal transmission gain and enhances the coverage of the PRACH. DRAWINGS

 1 is a schematic structural diagram of a random access channel signal in the prior art;

 FIG. 2 is a timing diagram of a random access Preamble sequence of a user in a cell in the prior art; FIG. 2 is a timing diagram of a random access Preamble sequence of a cell edge user in the prior art; FIG. 3 is a schematic diagram of a method according to an embodiment of the present invention; Schematic diagram of the process;

 4 is a schematic flowchart of another method according to an embodiment of the present invention;

FIG. 5a is a schematic diagram of PRACH signal transmission according to Embodiment 1 of the present invention; FIG. FIG. 5b is a schematic flowchart of an execution process according to Embodiment 1 of the present invention; FIG.

 FIG. 5c is a schematic diagram of PRACH signal transmission according to Embodiment 2 of the present invention; FIG.

 FIG. 5 is a schematic diagram of an execution flow of Embodiment 2 of the present invention; FIG.

 5e is a schematic diagram of PRACH signal transmission according to Embodiment 3 of the present invention;

 FIG. 5f is a schematic flowchart of an execution process according to Embodiment 3 of the present invention; FIG.

 5G is a schematic diagram of a method for receiving, by a base station, a PRACH signal according to Embodiment 3 of the present invention;

 FIG. 6 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure;

 FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention. detailed description

 In order to enhance the coverage of the PRACH, the embodiment of the present invention provides a PRACH transmission method.

 Referring to FIG. 3, a PRACH transmission method provided by an embodiment of the present invention includes the following steps:

 Step 30: The user equipment determines an initial sending time of the PRACH signal.

 Step 31: The user equipment transmits a PRACH signal on an uplink subframe included in the N uplink subframe groups, where the N is an integer greater than 1, and each uplink subframe group includes An uplink subframe or a plurality of consecutive uplink subframes of the PRACH signal are transmitted.

 In step 31, the user equipment transmits the PRACH signal in the uplink subframe included in the N uplink subframe groups, and the specific implementation may be as follows:

For each of the N uplink subframe groups, the user equipment transmits a PRACH signal on the uplink subframe included in the uplink subframe group, and the structure of each PRACH signal may be as shown in FIG. A newly defined structure including a CP and a random access Preamble sequence can be used; for example, for uplink and downlink configuration 0, subframes 2, 3, and 4 constitute one uplink subframe group, and subframes 7, 8, and 9 constitute one. The uplink subframe group, the uplink subframe group including the three uplink subframes may transmit the PRACH signal corresponding to the Preamble format 3 in Table 1; the subframes 2 and 3 may also constitute an uplink subframe including two uplink subframes. The frame group can transmit the PRACH signals corresponding to Preamble format 1 and Preamble format 2 in Table 1. Subframe 2 and subframe 3 respectively constitute an uplink subframe group including one uplink subframe, and may transmit a PRACH signal corresponding to Preamble format 0 in Table 1; at this time, a random access Preamble sequence in each PRACH signal transmitted The scheme can be used for the repetition of the PRACH signal, and the duration of the PRACH signal is increased, thereby improving the signal transmission gain and enhancing the coverage of the PRACH; or, the user equipment is included in the uplink of the N uplink subframe groups. A PRACH signal is transmitted on the subframe; at this time, each random access Preamble sequence in the PRACH signal may be the same; the scheme increases the signal transmission gain by increasing the duration of one PRACH signal, and enhances the coverage of the PRACH. Preamble time series

 GT

 Format length length

0 1ms 3168x7; 24576x7; 839 -96.8 us

1 2ms 21024x7; 24576x 7; 839 -516 us

2 2ms 6240x7; 2x24576x7; 839 ~197us

3 3 ms 21024x7; 2x24576x7; 839 -716 us

4 ~ 157.3us 448x7; 4096x 7; 139 ~ 9.38us

 Table 1

 The format of the five random access Preamble sequences defined in Table 1, each format has a different length in the time domain, but it occupies 6 physical resource blocks (PRBs) in the frequency domain. . Preamble format 4 can only be transmitted in the Uplink Pilot Time Slot (UpPTS) domain.

 Time Division Synchronous Code Division Multiple Access - The TD-SCDMA Long Term Evolution (TD-LTE) system supports seven different uplink and downlink subframe configurations, as shown in Table 2 below.

 Table 2

 Specifically, the user equipment transmits a PRACH signal on an uplink subframe included in the N uplink subframe groups, and the specific implementation may be as follows:

The user equipment transmits a CP signal with a length of T _C p and a random access Preamble sequence of SEQ 1 with a duration of T _seq1 on an uplink subframe included in the first uplink subframe group of the N uplink subframe groups, at N a random access Preamble sequence SEQi with a transmission duration of T _se qi on an uplink subframe included in the ith uplink subframe group in the uplink subframe group, where The value range of i is [2, N]; wherein, the CP signal is the sequence signal of the last segment of the SEQN with a length of Tcp. The scheme reduces the proportion of the CP signal in the PRACH signal, and improves the proportion of the useful signal. In addition, in the FDD-LTE, since the uplink subframe is continuously distributed, the PRACH channel can directly extend the existing format, that is, the repetition of the extended sequence. The number of times, in this way, based on the scheme, the PRACH structure of the TDD-LTE obtained by the base station side is consistent with the PRACH structure in the FDD-LTE, so that the fusion of the two systems can be implemented.

Preferably, in order to avoid interference with other users, it is necessary to reserve GT in each uplink subframe group, so that the difference between T and Tcp and Tseql (ie,

) is equal to the GT length reserved for the first uplink subframe group; the difference between Τ and Tseqi (ie, TT _seqi ) is equal to the GT length reserved for the ith uplink subframe group. T is the duration of the uplink subframe group.

 Preferably, in order to achieve the purpose of repeatedly transmitting M random access Preamble sequences, to increase the useful signal power and effectively improve PRACH coverage, SEQ1 and SEQi may be composed of integer or non-integer basic random access Preamble sequences. Signal sequence; and,

 SEQ1, SEQ2, ..., SEQN can form M basic random access Preamble sequences end-to-end in time sequence; M is an integer greater than 1; wherein the basic random access Preamble sequence is defined in 3GPP Release 11 and previous versions In the PRACH signal of Preamble format 0, the signal sequence after CP is removed.

Visible, through the above program, in her body! ^+! +...+! ^! ^+! During the time, M basic random access Preamble sequences are transmitted. If the duration of a random access Preamble sequence is T _basicse q=24576Ts, then Ttoal_M*Tbasicseq.

 In step 30, the user equipment determines the initial transmission time of the PRACH signal, and the specific implementation may be as follows: the user equipment determines a time period of the PRACH resource and a time offset value of the initial transmission time of the PRACH signal in the time period;

 Determining, by the user equipment, the radio frame that meets the first preset condition according to the determined time period and the time offset value, determining the kth uplink subframe group in the radio frame as the initial sending time of the PRACH signal; or, the user The device determines, according to the time period and the time offset value, an uplink subframe group that meets the second preset condition, and determines the uplink subframe group as a start sending time of the PRACH signal. k is an integer that is not less than 0 and is not greater than the maximum value of the number of uplink subframe groups included in each radio frame. The value of k may be pre-agreed by the user equipment and the network side, or may be pre-defined by the network side. The value of k is notified to the user equipment, that is, the user equipment determines the value of k according to the configuration information sent in advance by the network side.

In this solution, the user equipment may determine the initial sending time of the PRACH signal according to the time period and the time offset value of the PRACH resource, and the time period and the time offset value of the PRACH resource are both maintained by the user equipment and the network side, so that The user equipment and the base station can understand the transmission timing of the PRACH signal, thereby ensuring the accuracy of the PRACH signal detection. For example, the first preset condition can be:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 Where SFN is the system frame number of the radio frame, E HANCEDPRACH_STARTFRAMEOFFSET is the determined time offset value, the unit is the radio frame, and T is the determined time period, and the unit is the radio frame.

 The second preset condition can be:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 SFN is the system frame number of the radio frame, E HANCEDPRACH_STARTFRAMEOFFSET is the determined time offset value, the unit is the uplink subframe group, and T is the determined time period, and the unit is the radio frame.

 Here, the method for the user equipment to determine the time period of the PRACH resource may be as follows: the user equipment and the network side pre-arrange the time period of the PRACH resource, or determine the time period of the PRACH resource according to the configuration information sent in advance by the network side;

 The method for the user equipment to determine the time offset value of the initial transmission time of the PRACH signal in the time period may be as follows: The user equipment and the network side pre-arrange the time offset value of the initial transmission time of the PRACH signal in the time period, Or determining a time offset value of the initial transmission time of the PRACH signal in the time period according to the configuration information pre-transmitted by the network side.

In the Time Division Duplex (TDD) system, since the number of uplink subframes is different under different subframe ratios, for the TDD system, multiple PRACHs are allowed to be transmitted in one uplink subframe, and the first time is specified. Assign on the domain, if you can't put it in the time domain, consider placing multiple PRACHs in the frequency domain. For the format 0, 1, 2, 3 of the random access preamble sequence, the index number of the first physical resource block that can be used to transmit the PRACH is defined as the parameter ^1⁄2 ^ "is the physical resource block number given by the upper layer, The value range is: w _PRBoffset - _B _ u , For format ₄ , the index number of the first physical resource block that can be used to transmit the PRACH is the sequence number of the lowest end PRB of the band or the sequence number of the highest-end PRB.

The configuration of each PRACH should follow the principle of a certain ^D ^, first-time domain mapping, if there is not enough resources in the time domain to accommodate all PRACH and then perform frequency domain mapping. For format 0-3, the frequency division principle is followed. The following formula - proceed:

If / _A4 mod 2 = 0 otherwise

Where ^ ^ is the number of uplink resource blocks (RBs), which is the first one that can be used for a certain PRACH channel transmission. The resource block index number, "P^^" is the first resource block index number that can be used for the PRACH mapping in the subframe, and represents the channel resource number of the PRACH. It can be known that: PRACH resources of format 0-3 use a bilateral mapping method to sequentially allocate resources. For format 4, the frequency resource mapping is performed according to the following formula 2:

 Formula 2:

6 ^ , ((n _f mod 2)x(2 - N^) + ) mod 2 = 0

 H + ), other

Wherein, it is a field index, indicating that the PRACH is located in the first field or the second field in the radio frame; n _f is the system frame number, and N _sp is the number of uplink and downlink subframe switching points in one radio frame.

 In this method, the frequency domain resource used by the user equipment to transmit the PRACH signal in the uplink subframe included in the N uplink subframe groups may be the same as the frequency domain resource used in the PRACH in the prior art. Different, frequency domain resources that are not used at the same time can be determined as follows:

If the transmitted PRACH signal is in the Preamble format 0~3, the first physical resource block (PRB) for PRACH signal transmission is determined according to the following formula 3 or formula 4.

 If the transmitted PRACH signal is in Preamble format 4, the first one is determined according to Equation 3 below.

PRB index number of PRACH signal transmission

 Public three:

fuAMAX + ¹ fl

卞° , $n3⁄4/ _A4 mod 2 = 0 n

+ ¹

Otherwise, ^V is the number of uplink resource blocks (RBs), "^.^ is the first one specified in the ^^ system.

The PRB index number of the PRACH signal transmission is a preset, that is, the newly defined PRB index number that can be used for enhanced PRACH signal transmission, and is the channel resource number of the enhanced PRACH; ^^ is the PRACH specified in the LTE system. Number of.

After determining the first PRB index number used for PRACH signal transmission, the user equipment from the PRB index number pair The intended PRB starts to occupy a plurality of consecutive PRBs capable of carrying the PRACH signal, and performs PRACH signal transmission.

RA r where the user equipment can determine the values of ^PRB offietForEnancedPrach and J RAM4X according to the high layer signaling sent by the network side.

 When the frequency domain resource used by the user equipment to transmit the PRACH signal in the uplink subframe included in the N uplink subframe groups is different from the frequency domain resource used in the PRACH in the prior art, the base station can facilitate the base station to distinguish the user equipment. Whether it is necessary to cover enhanced user equipment or traditional user equipment.

 In this method, the value of N may be pre-agreed by the user equipment and the network side, or the value of N may be determined according to the configuration information sent in advance by the network side.

 In the method, the number and location of the uplink subframes included in each uplink subframe group may be pre-agreed by the user equipment and the network side, or the uplink subframe included in each uplink subframe group may be determined according to the configuration information previously sent by the network side. The number and location of frames.

 Referring to FIG. 4, a method for receiving a random access channel PRACH according to an embodiment of the present invention includes the following steps: Step 40: The network side determines an initial sending time of a PRACH signal sent by a user equipment;

 Step 41: The network side receives the PRACH signal sent by the user equipment in the uplink subframe included in the N uplink subframe groups, where the N is an integer greater than 1, and each uplink subframe. The group includes one uplink subframe or a plurality of consecutive uplink subframes for transmitting PRACH signals.

 In step 41, the network side receives the uplink sent by the user equipment on the uplink subframe included in the N uplink subframe groups.

The PRACH signal can be implemented as follows:

 For each of the N uplink subframe groups, the network side receives a PRACH signal sent by the user equipment in the uplink subframe included in the uplink subframe group, and the structure of each PRACH signal may be as shown in FIG. 1 . As shown, the newly defined structure containing a CP and a random access Preamble sequence can also be used;

The PRACH signal is combined; at this time, the random access Preamble sequences in the received PRACH signals may be the same; or

 The network side receives a PRACH signal sent by the user equipment on the uplink subframe included in the N uplink subframe groups; at this time, each random access Preamble sequence in the PRACH signal may be the same.

 Specifically, the network side receives one sent by the user equipment on an uplink subframe included in the N uplink subframe groups.

The PRACH signal can be implemented as follows:

First, the network side receives a CP signal of length T _cp and a random access Preamble sequence of SEQ 1 of duration T _seq1 in an uplink subframe included in the first uplink subframe group of the N uplink subframe groups, at N a random access Preamble sequence SEQi with a duration of T _se qi on an uplink subframe included in the ith uplink subframe group of the uplink subframe group, where i has a value range of [2, N]; The CP signal is the sequence signal of the last segment of SEQN of duration Tcp; Then, the network side superimposes the sample signal in the GTj duration of the jth uplink subframe group and the sample signal in the GTj duration of the beginning portion of the j+1th uplink subframe group; wherein, the value range of j [1, N-1], when j is 1, GT1 is equal to the difference between the duration of the uplink subframe group 1 and Tcp and Tseql (ie, GT1 = duration of the uplink subframe group 1 - T _{cp -} T _seq i), when j takes other values, GTj is equal to the difference between the duration of the uplink subframe group j and Tseqj (ie, GTj = duration of the uplink subframe group j - T _seq );

Then, the network side connects the unsuperimposed signal and the superimposed signal end to end in time sequence to obtain a CP signal and a duration of T _t . The PRACH signal formed by the _tal random access Preamble sequence and the protection time GT reserved by the uplink subframe group, where T _total = ∑ J^ ; Finally, the network side processes the obtained PRACH signal according to the merge detection algorithm to obtain the user. Random access Preamble sequence transmitted by the device.

 In step 40, the network side determines the initial transmission time of the PRACH signal, and the specific implementation may be as follows: The network side determines the time period of the PRACH resource and the time offset value of the initial transmission time of the PRACH signal in the time period;

 Determining, by the network side, the radio frame that meets the first preset condition, and determining, by using the time period and the time offset value, the kth uplink subframe group in the radio frame as the initial sending time of the PRACH signal; or And determining, by the user equipment, the uplink subframe group that meets the second preset condition according to the time period and the time offset value, and determining the uplink subframe group as the initial sending time of the PRACH signal. k is an integer that is not less than 0 and is not greater than the maximum value of the number of uplink subframe groups included in each radio frame. The value of k may be pre-agreed by the user equipment and the network side, or may be pre-defined by the network side. The value of k is notified to the user equipment.

 For example, the first preset condition can be:

 ( SFN+E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 Where SFN is the system frame number of the radio frame, E HANCEDPRACH_STARTFRAMEOFFSET is the determined time offset value, the unit is the radio frame, and T is the determined time period, and the unit is the radio frame.

 For example, the second preset condition can be:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, and the E HANCEDPRACH_STARTFRAMEOFFSET is the determined time offset value, the unit is the uplink subframe group, and T is the determined time period, and the unit is the radio frame.

Specifically, the method for determining the time period of the PRACH resource by the network side may be as follows: the network side and the user equipment pre-arrange the time period of the PRACH resource, or the network side sends the time period of the PRACH resource to the user equipment in advance; The method for determining, by the network side, the time offset value of the initial sending time of the PRACH signal in the time period may be as follows: The network side and the user equipment pre-arrange the time offset value of the initial sending time of the PRACH signal in the time period, Or, the network side sends the time offset value of the initial transmission time of the PRACH signal in the time period to the user equipment in advance.

 In this method, the network side receives the frequency domain resource where the PRACH signal is located in the uplink subframe included in the N uplink subframe groups, and may be the same as the frequency domain resource occupied by the PRACH in the prior art, or may be different. The frequency domain resources used can be determined as follows:

 If the PRACH signal is in the Preamble format 0~3, the first physical resource block PRB index number used for PRACH signal transmission is determined according to Equation 3 or Equation 4 below.

 If the PRACH signal is in Preamble format 4, the first PRB index number for PRACH signal transmission is determined according to the following formula 3

 Public three:

 1

卞° , $n3⁄4/ _A4 mod2 = 0

 n

+ ¹

Otherwise, ^V is the number of uplink resource blocks RB, ^ΡΚΒ . ·^ is the PRB index number that can be used for PRACH signal transmission specified in the first one specified in the LTE system, and is the first PRB index number that can be used for enhanced PRACH signal transmission, which is a reluctant PRACH. Channel resource number; is the number of PRACHs specified in the LTE system.

After determining the first PRB index number used for PRACH signal transmission, the network side receives the PRACH signal on a plurality of consecutive PRBs capable of carrying the PRACH signal starting from the PRB corresponding to the PRB index number. The network side also needs to notify the user equipment of the value of "^ ³ .^^.^^.^.

In this method, the value of N may be pre-agreed by the network side and the user equipment; or, the network side sends the value of N to the user equipment in advance. In this method, the number and location of the uplink subframes included in each uplink subframe group may be pre-agreed by the network side and the user equipment, or the network side pre-configures the uplink subframes included in each uplink subframe group by using configuration information. The number and location are notified to the user device.

 For example, the network side may notify the user equipment of the time period, the time offset value, the value of N, and the value of k through the PRACH-Config information elements, and the PRACH-Config information elements are specific. The structure is as follows:

 -- ASM START

 PRACH-ConfigSIB:: = SEQUENCE {

 rootSequencelndex INTEGER (0 .837>

 prach-Configlnfo PRACH-ConfigInfo

PRACH-Config:: = SEQUENCE {

 rootSequencelndex INTEGER (0 .837>

 prach-Configlnfo PRACH-Configlnfo OPTIONAL

- Need ON

PRACH-ConfigSCell-rlO:: SEQUENCE {

 prach-Configlndex-r 10 INTEGER (0 .63)

PRACH-ConfigInfo:: = SEQUENCE {

 prach-Configlndex INTEGER (0.63),

 highSpeedFlag BOOLEAN,

 zeroCorrelationZoneConfig INTEGER (0 .15),

 prach-FreqOffset INTEGER (0 .94)

 enhancedPrach-period〃 time period ENUMERATED { rffi, rfl6, rG2, rf64,rfl28 },

 The value of enhancedPrach-length//N is ENUMERATED { rffi, rfl6, rG2, rf64,rfl28 },

E HANCEDPRACH STARTFRAMEOFF SET / / time offset value INTEGER (0..63) _:

enhancedPrach-SubFrameGroupOfFset / / k value INTEGER (0,1) _:

- ASM STOP

The rf in rft in the above table represents 8 radio frames, and the others are similar. For example, the network side can also notify the user equipment of the value of the above η by means of the PRACH-Config information elements. At this time, the specific structure of the PRACH-Config information elements: 3⁄4:

 -- ASM START

 PRACH-ConfigSIB:: = SEQUENCE {

 rootSequencelndex INTEGER (0 .837>

 prach-Configlnfo PRACH-ConfigInfo

PRACH-Config:: = SEQUENCE {

 rootSequencelndex INTEGER (0 .837>

 prach-Configlnfo PRACH-Configlnfo OPTIONAL

- Need ON

PRACH-ConfigSCell-rlO:: SEQUENCE {

 prach-Configlndex-r 10 INTEGER (0 .63)

PRACH-ConfigInfo : := SEQUENCE {

 prach-Configlndex INTEGER (0 .63): enhancedprach-Configlndex 〃, the value of ^^ INTEGER (0..63):

 highSpeedFlag BOOLEAN,

 zeroCorrelationZoneConfig INTEGER (0..15),

prach-FreqOffset INTEGER (0..94) enhancedprach-FreqOffset II dp _rac h value INTEGER (0..94) - ASM STOP

 The present invention will be described below in conjunction with specific embodiments:

 Embodiment 1:

 In this embodiment, the downlink subframe configuration 0 is taken as an example, and three consecutive uplink subframes constitute one uplink subframe group, that is, the subframes 2, 3, and 4 of the radio frame constitute one uplink subframe group, and the subframe 7 of the radio frame. 8, 8 and 9 constitute an uplink subframe group, and each of the uplink subframe groups transmits the PRACH signal corresponding to the existing Preamble format 3, as shown in FIG. 5a. The specific process is shown in Figure 5b:

Step S01: The user equipment determines that the initial transmission time of the PRACH signal is the radio frame n; Step S02: From the radio frame n to the radio frame n+L, the user equipment uses the uplink subframe group transmission in each radio frame.

a PRACH signal, where each uplink subframe group transmits one PRACH signal, and 2 (L+1) PRACH signals are transmitted on 2 (L+1) uplink subframe groups in total;

 Step S03: The base station determines that the initial transmission time of the PRACH signal sent by the user equipment is the radio frame n;

 Step S04: From the radio frame n to the radio frame n+L, the base station receives the PRACH signal on the uplink subframe group in each radio frame, where a PRACH signal is received in each uplink subframe group, at a total of 2 (L+ 1) 2 (L+1) PRACH signals are received on one uplink subframe group; the base station combines all received PRACH signals.

 In this embodiment, by repeating the transmission of 2 (L + 1) PRACH signals, the duration of the PRACH signal is increased, thereby improving the signal transmission gain and enhancing the coverage of the PRACH.

 Embodiment 2:

 In this embodiment, the downlink subframe configuration 0 is taken as an example, and one uplink subframe constitutes one subframe group, that is, the subframes 2, 3, 4, 7, 8, and 9 of the radio frame respectively constitute an uplink subframe group, and each uplink The PRACH signal corresponding to the existing Preamble format 0 is transmitted on the subframe group, as shown in FIG. 5c. The specific process is shown in Figure 5d:

 Step S11: The user equipment determines that the initial transmission time of the PRACH signal is the radio frame n;

 Step S12: From the radio frame n to the radio frame n+L, the user equipment uses the uplink subframe group transmission in each radio frame.

a PRACH signal, where each uplink subframe group transmits a PRACH signal, and 6 (L+1) PRACH signals are transmitted on 6 (L+1) uplink subframe groups in total;

 Step S13: The base station determines that the initial transmission time of the PRACH signal sent by the user equipment is the radio frame n;

 Step S14: From the radio frame n to the radio frame n+L, the base station receives the PRACH signal on the uplink subframe group in each radio frame, where a PRACH signal is received in each uplink subframe group, at a total of 6 (L) 6 (L+1) PRACH signals are received on +1) uplink subframe groups; the base station combines all received PRACH signals.

 In this embodiment, by repeating the transmission of 6 (L+1) PRACH signals, the duration of the PRACH signal is increased, thereby improving the signal transmission gain and enhancing the coverage of the PRACH.

 Embodiment 3:

 In this embodiment, the downlink subframe configuration 0 is taken as an example, and three consecutive uplink subframes constitute one uplink subframe group, that is, the subframes 2, 3, and 4 of the radio frame constitute one uplink subframe group, and the subframe 7 of the radio frame. 8, 8 and 9 form an uplink subframe group, as shown in Figure 5e. From radio frame n to radio frame n+L, a PRACH signal is transmitted on the uplink subframe group in all radio frames. The specific process is shown in Figure 5f:

 Step S21: The user equipment determines that the initial transmission time of the PRACH signal is the radio frame n;

Step S22: From the radio frame n to the radio frame n+L, the user equipment uses the uplink subframe group in all the radio frames to transmit one PRACH signal, where the transmission duration on the uplink subframe included in the first uplink subframe group is T _cp 's CP letter The random access Preamble sequence SEQ1 of the number and duration is 1, and the random access Preamble sequence SEQi of the duration T _se qi is transmitted on the uplink subframe included in the subsequent i-th uplink subframe group, where the value range of i [2, N]; Step S23: The base station determines that the initial transmission time of the PRACH signal sent by the user equipment is the radio frame n;

Step S24: From the radio frame n to the radio frame n+L, the base station receives the CP signal with the duration T _cp and the random access Preamble sequence SEQ1 with the duration T _seq1 in the uplink subframe included in the first uplink subframe group. And receiving, in the uplink subframe included in the subsequent i-th uplink subframe group, a random access Preamble sequence SEQi having a duration of T _se qi, where i has a value range of [2, N];

 Step S25: The base station samples the signals of each uplink subframe group of the PRACH signal, and extracts the sequence signals of each uplink subframe group to form a complete PRACH signal, as shown in FIG. 5g:

 Superimposing the sample signal in the GTj duration of the jth uplink subframe group with the sample signal in the GTj duration of the beginning portion of the j+1th uplink subframe group; wherein j has a value range of [1, N-1], when j is 1, GT1 is equal to the difference between the duration of the uplink subframe group 1 and Tcp and Tseql. When j takes other values, GTj is equal to the difference between the duration of the uplink subframe group j and Tseqj. Value

The unsuperimposed signal and the superimposed signal are connected end to end in time sequence to obtain a CP signal with a duration of T _t . a PRACH signal consisting of a _tal random access preamble sequence and a guard time GT reserved by the uplink subframe group, where

N

Tt. Tal_ ^ T _seqk ,

 k=\

 According to the merge detection algorithm, the PRACH signal is processed to obtain a random access Preamble sequence transmitted by the user equipment.

 In this embodiment, the duration of a PRACH signal is the duration of the uplink subframe in the L+1 radio frames, which improves the signal transmission gain and enhances the coverage of the PRACH. Moreover, the base station side can obtain an effective sequence signal with a duration of Tseq 1 +Tseq2+ ... +Tseqn+ ... + TseqN, and the sequence includes M basic random access Preamble sequences, which can be configured to make M large enough to achieve Increase the useful signal power to effectively enhance channel coverage.

 Referring to FIG. 6, an embodiment of the present invention provides a user equipment, where the user equipment includes:

 a determining unit 60, configured to determine an initial sending time of the PRACH signal;

 The transmitting unit 61 is configured to transmit a PRACH signal on an uplink subframe included in the N uplink subframe groups, starting from the initial transmission time;

 Where N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes for transmitting the PRACH signal.

The determining unit 60 may be a processor or the like, and the transmitting unit 61 may be configured to have a transceiving function. transmission device.

 Further, the transmission unit 61 is configured to:

 Transmitting a PRACH signal on an uplink subframe included in the uplink subframe group for each uplink subframe group in the N uplink subframe groups; or

 A PRACH signal is transmitted on an uplink subframe included in the N uplink subframe groups.

 Further, the transmission unit 61 is configured to:

Transmitting a cyclic prefix CP signal having a duration of T _cp and a random access preamble Preamble sequence SEQ1 having a duration of 1 on an uplink subframe included in the first uplink subframe group of the N uplink subframe groups, a random access Preamble sequence SEQi with a transmission duration of T _se qi on an uplink subframe included in the ith uplink subframe group of the N uplink subframe groups, where i has a value range of [2, N];

 The CP signal is a sequence signal of the last segment of SEQN of length Tcp.

 Further, the difference between T and Tcp and Tseql is equal to the guard time GT length reserved by the first uplink subframe group; the difference between T and Tseqi is equal to the reserved GT length of the i-th uplink subframe group; The duration of the uplink subframe group.

 Further, SEQ1 and SEQi are signal sequences composed of an integer number or a non-integer number of substantially random access Preamble sequences;

 SEQ1, SEQ2, ..., SEQN can form M basic random access Preamble sequences end-to-end in time sequence; M is an integer greater than 1; in the PRACH signal of format 0, the signal sequence after CP is removed.

 Further, the transmission unit 61 is further configured to:

 The value of N is pre-agreed with the network side, or the configuration information pre-sent by the network side determines the value of N. Further, the determining unit 60 is configured to:

 Determining a time period of the PRACH resource and a time offset value of the initial transmission time of the PRACH signal in the time period;

 Determining, according to the time period and the time offset value, a radio frame that meets a first preset condition, and determining a kth uplink subframe group in the radio frame as a start sending time of the PRACH signal; or, according to Determining, by the time period and the time offset value, an uplink subframe group that meets a second preset condition, determining the uplink subframe group as a start transmission time of the PRACH signal; k is not less than 0, and is not greater than An integer of the maximum of the number of uplink subframe groups included in each radio frame.

 Further, the determining unit 60 is configured to:

The time period in which the PRACH resource is pre-agreed with the network side, or determined according to the configuration information sent in advance by the network side. The time period of the PRACH resource;

 Determining, by the network side, a time offset value of the initial transmission time of the PRACH signal in the time period, or determining a time offset value of the initial transmission time of the PRACH signal in the time period according to the configuration information previously sent by the network side. ;

 The value of k is pre-agreed with the network side, or the configuration information pre-sent by the network side determines the value of k. Further, the first preset condition is:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the radio frame, and T is the time period, and the unit is the radio frame.

 Further, the second preset condition is:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, and the E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the uplink subframe group, and T is the time period, and the unit is the radio frame.

 Further, the transmission unit 61 is further configured to:

 If the PRACH signal is in the Preamble format 0~3, the first physical resource block PRB index number used for PRACH signal transmission is determined according to Equation 3 or Equation 4 below.

 If the PRACH signal is in Preamble format 4, the first PRB index number for PRACH signal transmission is determined according to the following formula 3

 Public three:

otherwise

Where ^V is the number of uplink resource blocks RB, ^ΡΚΒ . ·^ is the first one specified in the LTE system.

 RA

The PRB index number used for PRACH signal transmission is a preset PRB index number that can be used for enhanced PRACH signal transmission, and a channel resource number of the PRACH of the f dPrach string; It is the number of PRACHs specified in the LTE system.

Further, the transmitting unit 61 is further configured to: determine the value of the ^PRB offietForEnhancedPrach, according to the high layer signaling sent by the network side.

 Further, the transmission unit 61 is further configured to:

 The number and location of the uplink subframes included in each uplink subframe group are pre-agreed with the network side, or the number and location of the uplink subframes included in each uplink subframe group are determined according to the configuration information previously sent by the network side.

 Further, the transmitting unit 61 transmits each PRACH signal when transmitting one PRACH signal in an uplink subframe included in the uplink subframe group for each of the N uplink subframe groups. The random access Preamble sequence is the same;

 When a PRACH signal is transmitted on an uplink subframe included in the N uplink subframe groups, each random access Preamble sequence in the PRACH signal is the same.

 Referring to FIG. 7, an embodiment of the present invention further provides a base station, where the base station includes:

 a determining unit 70, configured to determine a start sending time of the PRACH signal sent by the user equipment;

 The receiving unit 71 is configured to receive, according to the initial sending time, the PRACH signal sent by the user equipment on the uplink subframe included in the N uplink subframe groups;

 N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes configured by the network side for transmitting the PRACH signal.

 The determining unit 70 may be a processor or the like, and the receiving unit 71 may be a transmitting device having a transceiving function.

 Further, the receiving unit 71 is configured to:

 Receiving, by the uplink sub-frame included in the uplink sub-frame group, a PRACH signal sent by the user equipment, and combining the received PRACH signals for each of the N uplink sub-frame groups; or And receiving a PRACH signal sent by the user equipment on an uplink subframe included in the N uplink subframe groups.

 Further, the receiving unit 71 is configured to:

The N uplink sub-frame group in the uplink subframe of an uplink sub-frame included in the group when receiving a length of a cyclic prefix CP signal and the duration T _CP of a random access preamble Preamble sequence SEQ1 1 in the a random access Preamble sequence SEQi having a duration of T _se qi received in an uplink subframe included in the ith uplink subframe group of the N uplink subframe groups, where i has a value range of [2, N]; The CP signal is a sequence signal of a last period of time Tcp in the SEQN;

The GTj in the GTj duration of the jth uplink subframe group and the GTj in the beginning part of the j+1th uplink subframe group The sigma-like signal is superimposed in the duration; where j is in the range [1, N-1], and when j is 1, GT1 is equal to the uplink subframe group.

The duration of 1 is the difference between Tcp and Tseql. When j takes other values, GTj is equal to the difference between the duration of the uplink subframe group j and Tseqj;

The unsuperimposed signal and the superimposed signal are connected end to end in time sequence to obtain a CP signal with a duration of T _t . a PRACH signal consisting of a _tal random access preamble sequence and a guard time GT reserved by the uplink subframe group, where

N

Tt. Tal_ ^ T _seqk ,

 k=\

 The PRACH signal is processed according to the merge detection algorithm to obtain a random access Preamble sequence transmitted by the user equipment.

 Further, the receiving unit 71 is further configured to:

 Pre-arranging the value of N with the user equipment; or,

 The value of N is sent to the user equipment in advance.

 Further, the determining unit 70 is configured to:

 Determining a time period of the PRACH resource and a time offset value of the initial transmission time of the PRACH signal in the time period;

 Determining, according to the time period and the time offset value, a radio frame that satisfies a first preset condition, and determining a kth uplink subframe group in the radio frame as a start sending time of a PRACH signal; or, a user The device determines, according to the time period and the time offset value, an uplink subframe group that meets the second preset condition, and determines the uplink subframe group as a start sending time of the PRACH signal; k is not less than 0, and An integer not greater than the maximum of the number of uplink subframe groups included in each radio frame.

 Further, the determining unit 70 is configured to:

 Pre-arranging the time period of the PRACH resource with the user equipment, or pre-sending the time period of the PRACH resource to the user equipment;

 Pre-arranging, with the user equipment, a time offset value of the initial transmission time of the PRACH signal in the time period, or transmitting a time offset value of the initial transmission time of the PRACH signal in the time period to the user equipment;

 The value of k is pre-agreed with the user equipment, or the value of k is pre-transmitted to the user equipment.

 Further, the first preset condition is:

 ( SFN+E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the radio frame, and T is the time period, and the unit is the radio frame.

Further, the second preset condition is: ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, and the E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the uplink subframe group, and T is the time period, and the unit is the radio frame.

 Further, the receiving unit 71 is further configured to:

 If the PRACH signal is in the Preamble format 0~3, the first physical resource block PRB index number used for PRACH signal transmission is determined according to Equation 3 or Equation 4 below.

 If the PRACH signal is in Preamble format 4, the first PRB index number for PRACH signal transmission is determined according to the following formula 3

 Public three:

1

卞° , $n3⁄4/ _A4 mod2 = 0

 n

+ ¹

Otherwise, ^V is the number of uplink resource blocks RB, ^ΡΚΒ . ·^ is the PRB index number that can be used for PRACH signal transmission specified in the first one specified in the LTE system. It is the first PRB index number that can be used for enhanced PRACH signal transmission, and is the PRACH of the string. Channel resource number; is the number of PRACHs specified in the LTE system.

 Further, the receiving unit 71 is further configured to: notify, by using the high layer signaling, the value of the J to the user equipment in advance.

 Further, the receiving unit 71 is further configured to:

 The number and location of the uplink subframes included in each uplink subframe group are pre-agreed with the user equipment, or the number and location of the uplink subframes included in each uplink subframe group are notified to the user equipment in advance through the configuration information.

 Further, the receiving unit 71 receives, when receiving, a PRACH signal sent by the user equipment in an uplink subframe included in the uplink subframe group for each of the uplink subframe groups of the N uplink subframe groups. The random access Preamble sequence in each PRACH signal is the same;

When receiving a PRACH signal sent by the user equipment on an uplink subframe included in the N uplink subframe groups, Each of the random access Preamble sequences in the PRACH signal is the same.

 In summary, the beneficial effects of the present invention include:

 In the solution provided by the embodiment of the present invention, the user equipment transmits the PRACH signal in the uplink subframe included in the N uplink subframe groups, where N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or Compared with the prior art, the duration of the PRACH signal transmitted in the solution is longer, thereby improving the signal transmission gain, enhancing the coverage of the PRACH, and improving the coverage performance of the network. .

 The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

 The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

 These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

 Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

 It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

A method for transmitting a random access channel PRACH, the method comprising:

 The user equipment determines an initial transmission time of the PRACH signal;

 The user equipment transmits the PRACH signal on the uplink subframe included in the N uplink subframe groups, starting from the initial transmission time;

 Where N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes for transmitting the PRACH signal.

 The method according to claim 1, wherein the transmitting the PRACH signal on the uplink subframe included in the N uplink subframe groups includes:

 For each of the N uplink subframe groups, the user equipment transmits a PRACH signal on the uplink subframe included in the uplink subframe group; or

 The user equipment transmits a PRACH signal on an uplink subframe included in the N uplink subframe groups.

 The method of claim 2, wherein the user equipment transmits a PRACH signal in an uplink subframe that is included in the N uplink subframe groups, and specifically includes:

The user equipment transmits a cyclic prefix CP signal of T _cp duration and a random access preamble sequence SEQ1 of duration T _seq1 on an uplink subframe included in the first uplink subframe group of the N uplink subframe groups when transmission of the uplink subframe N uplink sub-frame group in the i-th uplink sub-frame group included in the length of the random access _sEQi T seqi Preamble sequence, wherein i is in the range [2, N ];

The CP signal is a sequence signal of the last segment of SEQN of length T _cp .

 The method according to claim 3, wherein the difference between T and Tcp and Tseqi is equal to the guard time GT length reserved by the first uplink subframe group; the difference between T and Tseqi is equal to the i-th uplink The length of the GT reserved by the subframe group; where T is the duration of the uplink subframe group.

 5. The method according to claim 3, wherein SEQ1 and SEQi are signal sequences consisting of an integer number or a non-integer number of basic random access Preamble sequences;

 SEQ1, SEQ2, ..., SEQN can form M basic random access Preamble sequences end-to-end in time sequence; M is an integer greater than 1; in the PRACH signal of format 0, the signal sequence after CP is removed.

 6. The method of any of claims 1-5, further comprising:

The user equipment and the network side pre-arrange the value of N, or determine the N according to the configuration information sent in advance by the network side. Value.

 The method according to any one of claims 1-5, wherein the determining, by the user equipment, the initial sending time of the PRACH signal, specifically includes:

 Determining, by the user equipment, a time period of the PRACH resource and a time offset value of the initial transmission time of the PRACH signal in the time period;

 Determining, by the user equipment, the radio frame that meets the first preset condition, and determining, by using the time period and the time offset value, the kth uplink subframe group in the radio frame as the initial sending time of the PRACH signal; or The user equipment determines, according to the time period and the time offset value, an uplink subframe group that meets the second preset condition, and determines the uplink subframe group as a start sending time of the PRACH signal; k is not less than 0. And not greater than an integer of the maximum value of the number of uplink subframe groups included in each radio frame.

 The method according to claim 7, wherein the method for determining, by the user equipment, the time period of the PRACH resource comprises: pre-arranging the time period of the PRACH resource by the user equipment and the network side, or determining according to the configuration information sent in advance by the network side. The time period of the PRACH resource;

 The method for the user equipment to determine the time offset value of the initial transmission time of the PRACH signal in the time period includes: the user equipment and the network side pre-arranging the time offset value of the initial transmission time of the PRACH signal in the time period, or Determining, according to configuration information pre-transmitted by the network side, a time offset value of the initial transmission time of the PRACH signal in the time period;

 The value of the k is pre-agreed by the user equipment and the network side, or determined according to configuration information sent in advance by the network side.

9. The method according to claim 7, wherein the first preset condition is:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the radio frame, and T is the time period, and the unit is the radio frame.

 10. The method according to claim 7, wherein the second preset condition is:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, and the E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the uplink subframe group, and T is the time period, and the unit is the radio frame.

 The method according to any one of claims 1-5, wherein the frequency domain resource used by the user equipment to transmit the PRACH signal in the uplink subframe included in the N uplink subframe groups, Determine as follows:

If the PRACH signal preclude 0 to 3, according to the following formula 3 of the formula or four Preamble format determined by a first physical resource block PRB index PRACH signal transmission number eleven feet for _H;

If the PRACH signal is in Preamble format 4, the first one is determined for PRACH according to the following formula 3 PRB index number of signal transmission

 Public three:

otherwise

Where ^V is the number of uplink resource blocks RB, ^ΡΚΒ . ·^ is the PRB index number that can be used for PRACH signal transmission specified in the first one specified in the LTE system, and is the first PRB index number that can be used for enhanced PRACH signal transmission, which is a reluctant PRACH. Channel resource number; is the number of PRACHs specified in the LTE system.

The method according to claim 11, wherein the user equipment determines, according to the high layer signaling sent by the network side,

 The method according to any one of claims 1 to 5, further comprising:

 The user equipment and the network side pre-arrange the number and location of the uplink subframes included in each uplink subframe group, or determine the number and location of the uplink subframes included in each uplink subframe group according to the configuration information pre-transmitted by the network side.

 The method according to any one of claims 2 to 5, wherein, in the uplink subframe of the uplink subframe group, the uplink subframe included in the uplink subframe group of the N uplink subframe groups When a PRACH signal is transmitted on a frame, the random access Preamble sequence in each PRACH signal transmitted is the same;

 When a user equipment transmits a PRACH signal on an uplink subframe included in the N uplink subframe groups, each random access Preamble sequence in the PRACH signal is the same.

 A method for receiving a random access channel PRACH, the method comprising:

 The network side determines an initial sending time of the PRACH signal sent by the user equipment;

 The network side receives the PRACH signal sent by the user equipment in the uplink subframe included in the N uplink subframe groups, starting from the initial transmission time;

N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes configured by the network side for transmitting PRACH signals.

The method of claim 15, wherein the receiving the PRACH signal sent by the user equipment on the uplink subframe included in the N uplink subframe groups includes:

 For each of the N uplink subframe groups, the network side receives a PRACH signal sent by the user equipment in the uplink subframe included in the uplink subframe group; and combines the received PRACH signals. Or,

 The network side receives a PRACH signal sent by the user equipment on the uplink subframe included in the N uplink subframe groups.

 The method of claim 16, wherein the network side receives a PRACH signal that is sent by the user equipment in an uplink subframe that is included in the N uplink subframe groups, and specifically includes:

 The receiving time of the uplink subframe included in the first uplink subframe group of the N uplink subframe groups is

The cyclic prefix CP signal of T _C p and the random access preamble sequence SEQ1 of the duration T _seq1 , the receiving duration of the uplink subframe included in the ith uplink subframe group in the N uplink subframe groups is a random access Preamble sequence SEQi of T _seqi , where i has a value range of [2, N]; the CP signal is a sequence signal of a last period of time Tcp in SEQN;

 The network side superimposes the sample signal in the GTj duration of the jth uplink subframe group with the sample signal in the GTj duration of the beginning portion of the j+1th uplink subframe group; wherein, the value range of j is [ 1, N-1], when j is 1, GT1 is equal to the difference between the duration of the uplink subframe group 1 and Tcp and Tseql. When j takes other values, GTj is equal to the duration of the uplink subframe group j and Tseqj. Difference

The network side connects the unsuperimposed signal and the superimposed signal end to end in time sequence to obtain the CP signal and the duration is T _t . PRACH signal guard time _tal Preamble sequence and the random access uplink subframes reserved group consisting of GT, wherein, T _total = Σr _^; the network side of the PRACH signal is processed according to the detection algorithm merge, the user equipment transmits to give Random access Preamble sequence.

 The method according to any one of claims 15-17, further comprising:

 The network side and the user equipment pre-arrange the value of N; or

 The network side sends the value of N to the user equipment in advance.

 The method according to any one of claims 15-17, wherein the determining, by the network side, the initial sending time of the PRACH signal comprises:

Determining, by the network side, a time period of the PRACH resource and a time offset value of the initial transmission time of the PRACH signal in the time period; Determining, by the network side, the radio frame that meets the first preset condition, and determining, by using the time period and the time offset value, the kth uplink subframe group in the radio frame as the initial sending time of the PRACH signal; or The user equipment determines, according to the time period and the time offset value, an uplink subframe group that meets the second preset condition, and determines the uplink subframe group as a start sending time of the PRACH signal; k is not less than 0. And not greater than an integer of the maximum value of the number of uplink subframe groups included in each radio frame.

 The method according to claim 19, wherein the method for determining the time period of the PRACH resource by the network side comprises: pre-arranging the time period of the PRACH resource by the network side and the user equipment, or time period of the PRACH resource by the network side Pre-sent to the user equipment;

 The method for determining, by the network side, the time offset value of the initial sending time of the PRACH signal in the time period includes: the network side and the user equipment pre-arranging the time offset value of the initial sending time of the PRACH signal in the time period, or Transmitting, by the network side, a time offset value of the initial transmission time of the PRACH signal in the time period to the user equipment;

 The value of k is pre-agreed by the network side and the user equipment, or the value of k is sent to the user equipment in advance by the network side.

The method according to claim 19, wherein the first preset condition is:

 ( SFN+E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the radio frame, and T is the time period, and the unit is the radio frame.

 22. The method according to claim 19, wherein the second preset condition is:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, and the E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the uplink subframe group, and T is the time period, and the unit is the radio frame.

 The method according to any one of claims 15-17, wherein the network side receives the frequency domain resource where the PRACH signal is located in the uplink subframe included in the N uplink subframe groups, and determines according to the following method:

If the PRACH signal preclude 0 to 3, according to the following formula 3 of the formula or four Preamble format determined by a first physical resource block PRB index PRACH signal transmission number eleven feet for _H;

 If the PRACH signal is in Preamble format 4, the first index number for PRACH signal transmission is determined according to Equation 3 below;

Formula 3:

 1

卞° , $n3⁄4/ _A4 mod2 = 0 n

+ ¹

 Otherwise

2 where ^V is the number of uplink resource blocks RB, ^ΡΚΒ . ·^ is the PRB index number that can be used for PRACH signal transmission specified in the first one specified in the LTE system. ^PRB is the first PRB index number that can be used for enhanced PRACH signal transmission, which is a reluctant PRACH. Channel resource number; is the number of PRACHs specified in the LTE system.

 The method according to claim 23, further comprising: the network side notifying the user equipment of the value of the high-level signaling in advance.

The method according to any one of claims 15-17, further comprising:

 The network side and the user equipment pre-arrange the number and location of the uplink subframes included in each uplink subframe group, or the network side notifies the user equipment of the number and location of the uplink subframes included in each uplink subframe group in advance through the configuration information. .

 The method according to any one of claims 16-17, wherein, in the network side, for each of the N uplink subframe groups, the uplink subframe included in the uplink subframe group When receiving a PRACH signal sent by the user equipment, the random access Preamble sequence in each received PRACH signal is the same;

 When the network side receives a PRACH signal sent by the user equipment on the uplink subframe included in the N uplink subframe groups, the random access Preamble sequences in the PRACH signal are the same.

 27. A user equipment, the user equipment comprising:

 a determining unit, configured to determine a starting transmission time of the PRACH signal;

 a transmitting unit, configured to upload a PRACH signal in an uplink subframe included in the N uplink subframe groups, starting from the initial transmission time;

 Where N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes for transmitting the PRACH signal.

 The user equipment according to claim 27, wherein the transmission unit is configured to:

For each uplink subframe group of the N uplink subframe groups, transmitting on the uplink subframe included in the uplink subframe group a PRACH signal; or,

 A PRACH signal is transmitted on an uplink subframe included in the N uplink subframe groups.

 The user equipment according to claim 28, wherein the transmission unit is configured to:

Transmitting a cyclic prefix CP signal having a duration of T _cp and a random access preamble Preamble sequence SEQ1 having a duration of 1 on an uplink subframe included in the first uplink subframe group of the N uplink subframe groups, a random access Preamble sequence SEQi with a transmission duration of T _se qi on an uplink subframe included in the ith uplink subframe group of the N uplink subframe groups, where i has a value range of [2, N];

 The CP signal is a sequence signal of the last segment of SEQN of length Tcp.

 The user equipment according to claim 29, wherein the difference between T and Tcp and Tseq1 is equal to the guard time GT length reserved by the first uplink subframe group; the difference between T and Tseqi is equal to the ith Reserved for the uplink subframe group

GT length; where T is the duration of the uplink subframe group.

 31. The user equipment according to claim 29, wherein SEQ1 and SEQi are signal sequences consisting of an integer number or a non-integral number of substantially random access preamble sequences;

 SEQ1, SEQ2, ..., SEQN can form M basic random access Preamble sequences end-to-end in time sequence; M is an integer greater than 1; in the PRACH signal of format 0, the signal sequence after CP is removed.

 The user equipment according to any one of claims 27 to 31, wherein the transmission unit is further configured to: pre-arrange N value with the network side, or determine configuration information pre-transmitted by the network side. The value of N.

The user equipment according to any one of claims 27 to 31, wherein the determining unit is configured to: determine a time period of the PRACH resource and a time offset of the initial transmission time of the PRACH signal in the time period Value shift

 Determining, according to the time period and the time offset value, a radio frame that meets a first preset condition, and determining a kth uplink subframe group in the radio frame as a start sending time of the PRACH signal; or, according to Determining, by the time period and the time offset value, an uplink subframe group that meets a second preset condition, determining the uplink subframe group as a start transmission time of the PRACH signal; k is not less than 0, and is not greater than An integer of the maximum of the number of uplink subframe groups included in each radio frame.

 The user equipment according to claim 33, wherein the determining unit is configured to:

 Determining a time period of the PRACH resource with the network side, or determining a time period of the PRACH resource according to the configuration information sent in advance by the network side;

And the network side pre-agreed the time offset value of the initial transmission time of the PRACH signal in the time period, or root Determining, according to the configuration information pre-transmitted by the network side, a time offset value of the initial transmission time of the PRACH signal in the time period;

 The value of k is pre-agreed with the network side, or the configuration information pre-sent by the network side determines the value of k.

The user equipment according to claim 33, wherein the first preset condition is:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the radio frame, and T is the time period, and the unit is the radio frame.

 The user equipment according to claim 33, wherein the second preset condition is:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, and the E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the uplink subframe group, and T is the time period, and the unit is the radio frame.

 The user equipment according to any one of claims 27 to 31, wherein the transmission unit is further configured to: if the PRACH signal is in the Preamble format 0~3, according to the following formula 3 or formula 4 Determining the first physical resource block PRB index number used for PRACH signal transmission

 If the PRACH signal is in Preamble format 4, the first PRB index number for PRACH signal transmission is determined according to the following formula 3

 Public three:

otherwise

Where ^V is the number of uplink resource blocks RB, ^ΡΚΒ . ·^ is the PRB index number that can be used for PRACH signal transmission specified in the first one specified in the LTE system. ^PRB offsetForEnhancedPrach is the first PRB index number that can be used for enhanced PRACH signal transmission, fh dp _rac h It is a channel resource number of the reluctant PRACH; it is the number of PRACHs specified in the LTE system.

The user equipment according to claim 37, wherein the transmission unit is further configured to: The value of ^PRB offietForEnhancedPrach is determined according to the high layer signaling sent by the network side.

 The user equipment according to any one of claims 27 to 31, wherein the transmitting unit is further configured to: pre-agreed with the network side the number and location of uplink subframes included in each uplink subframe group, Or determining the number and location of the uplink subframes included in each uplink subframe group according to the configuration information pre-transmitted by the network side.

 The user equipment according to any one of claims 28 to 31, wherein the transmission unit is included in the uplink subframe group for each of the N uplink subframe groups. When a PRACH signal is transmitted on an uplink subframe, the random access Preamble sequence in each PRACH signal transmitted is the same;

 When a PRACH signal is transmitted on an uplink subframe included in the N uplink subframe groups, each random access Preamble sequence in the PRACH signal is the same.

 41. A base station, the base station includes:

 a determining unit, configured to determine a start sending time of the PRACH signal sent by the user equipment;

 a receiving unit, configured to receive, according to the initial sending time, a PRACH signal sent by the user equipment in an uplink subframe included in the N uplink subframe groups;

 N is an integer greater than 1, and each uplink subframe group includes one uplink subframe or multiple consecutive uplink subframes configured by the network side for transmitting the PRACH signal.

 The base station according to claim 41, wherein the receiving unit is configured to:

 Receiving, by the uplink sub-frame included in the uplink sub-frame group, a PRACH signal sent by the user equipment, and combining the received PRACH signals for each of the N uplink sub-frame groups; or And receiving a PRACH signal sent by the user equipment on an uplink subframe included in the N uplink subframe groups.

 The base station according to claim 42, wherein the receiving unit is configured to:

Receiving, on an uplink subframe included in the first uplink subframe group of the N uplink subframe groups, a cyclic prefix CP signal having a duration of T _cp and a random access preamble Preamble sequence SEQ1 having a duration of 1 The random access Preamble sequence SEQi of the uplink subframe included in the ith uplink subframe group of the N uplink subframe groups is T _se qi , where the value range of i is [2, N]; The CP signal is a sequence signal of a last period of time Tcp in the SEQN;

 Superimposing the sample signal in the GTj duration of the jth uplink subframe group with the sample signal in the GTj duration of the beginning portion of the j+1th uplink subframe group; wherein j has a value range of [1, N-1], when j is 1, GT1 is equal to the difference between the duration of the uplink subframe group 1 and Tcp and Tseql. When j takes other values, GTj is equal to the difference between the duration of the uplink subframe group j and Tseqj. Value

The unsuperimposed signal and the superimposed signal are connected end to end in time sequence to obtain a CP signal with a duration of T _t . a PRACH signal consisting of a _tal random access preamble sequence and a guard time GT reserved by the uplink subframe group, where N

Tt. Tal_ ^ T _seqk ,

 k=\

 The PRACH signal is processed according to the merge detection algorithm to obtain a random access Preamble sequence transmitted by the user equipment.

 The base station according to any one of claims 41 to 43, wherein the receiving unit is further configured to: pre-appoint a value of N with the user equipment; or

 The value of N is sent to the user equipment in advance.

 The base station according to any one of claims 41 to 43 wherein: the determining unit is configured to: determine a time period of the PRACH resource and a time offset of the initial transmission time of the PRACH signal in the time period Value

 Determining, according to the time period and the time offset value, a radio frame that satisfies a first preset condition, and determining a kth uplink subframe group in the radio frame as a start sending time of a PRACH signal; or, a user The device determines, according to the time period and the time offset value, an uplink subframe group that meets the second preset condition, and determines the uplink subframe group as a start sending time of the PRACH signal; k is not less than 0, and An integer not greater than the maximum of the number of uplink subframe groups included in each radio frame.

 The base station according to claim 45, wherein the determining unit is configured to:

 Pre-arranging the time period of the PRACH resource with the user equipment, or pre-sending the time period of the PRACH resource to the user equipment;

 Pre-arranging, with the user equipment, a time offset value of the initial transmission time of the PRACH signal in the time period, or transmitting the time offset value of the initial transmission time of the PRACH signal in the time period to the user equipment; The device pre-agreed the value of k, or pre-sends the value of k to the user equipment.

 The base station according to claim 45, wherein the first preset condition is:

 ( SFN+E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the radio frame, and T is the time period, and the unit is the radio frame.

 The base station according to claim 45, wherein the second preset condition is:

 ( SFN-E HANCEDPRACH STARTFRAMEOFFSET ) mod ( T ) =0;

 The SFN is the system frame number of the radio frame, and the E HANCEDPRACH_STARTFRAMEOFFSET is the time offset value, the unit is the uplink subframe group, and T is the time period, and the unit is the radio frame.

The base station according to any one of claims 41 to 43, wherein the receiving unit is further configured to: if the PRACH signal is in the Preamble format 0~3, determine according to the following formula 3 or formula 4 First Physical resource block PRB index number n for PRACH signal transmission

 If the PRACH signal is in Preamble format 4, the first one is determined for PRACH n according to the following formula 3

PRB index number of signal transmission

 Public three:

1

卞° , $n3⁄4/ _A4 mod2 = 0

 n

+ ¹

Otherwise, ^V is the number of uplink resource blocks RB, ^ΡΚΒ . ·^ is the PRB index number that can be used for PRACH signal transmission specified in the first one specified in the LTE system. It is the first PRB index number that can be used for enhanced PRACH signal transmission, and is the PRACH of the string. Channel resource number; is the number of PRACHs specified in the LTE system.

 The base station according to claim 49, wherein the receiving unit is further configured to: notify the user equipment of the value of J by using high layer signaling in advance.

 The base station according to any one of claims 41 to 43, wherein the receiving unit is further configured to: pre-agreed with the user equipment the number and location of uplink subframes included in each uplink subframe group, or The number and location of the uplink subframes included in each uplink subframe group are notified to the user equipment in advance through the configuration information.

 The base station according to any one of claims 42-43, wherein the receiving unit is included in the uplink subframe group for each of the N uplink subframe groups. When receiving a PRACH signal sent by the user equipment in the uplink subframe, the random access Preamble sequence in each received PRACH signal is the same;

 When receiving a PRACH signal sent by the user equipment on an uplink subframe included in the N uplink subframe groups, each random access Preamble sequence in the PRACH signal is the same.