WO2014166046A1 - 随机接入前导的发送与接收方法、以及相应的设备 - Google Patents
随机接入前导的发送与接收方法、以及相应的设备 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
Definitions
- the present invention relates to the field of communications, and more particularly to a method of transmitting and receiving random access preambles, and corresponding apparatus. Background technique
- a User Equipment In a wireless communication system, a User Equipment (UE) needs to establish a connection with a network, and this process is generally called random access.
- the channel that the UE sends the random access preamble is the Physical Random Access Channel (PRACH).
- PRACH Physical Random Access Channel
- the UE transmits a preamble channel to the evolved Node B (eNodeB), which is a PRACH.
- the preamble includes a Cyclic Prefix (CP) and a sequence, and is in the preamble. A guard interval was added afterwards.
- CP Cyclic Prefix
- the PRACH resources include time domain resources and frequency domain resources.
- a PRACH time domain resource includes a symbol, a subframe, a time slot, and/or a system frame occupied by a PRACH preamble and a guard interval.
- a PRACH frequency domain resource includes a subcarrier and/or a resource block occupied by a PRACH preamble and a guard interval. Block, RB).
- PRACH resources can also be referred to as PRACH opportunities.
- the random access process has two modes of competition and non-competition.
- the eNodeB configures the UE to perform random access preamble and the UE transmits the time-frequency resources available for the random access preamble through radio resource control (RRC) common signaling, and the UE randomly selects A preamble is accessed on a random time-frequency resource, so that the result of the access is random and does not guarantee 100% success.
- RRC radio resource control
- the preamble sent by the UE and the time-frequency resource where the preamble is transmitted are specified by the base station through RRC proprietary signaling.
- the embodiments of the present invention provide a method for transmitting and receiving a random access preamble, and a corresponding device, which can efficiently configure a channel feature of a UE with different channel characteristics. Corresponding PRACH resources, and improve the accuracy of the base station receiving the random access preamble.
- a method for transmitting a random access preamble includes: receiving, by a user equipment, a first physical random access channel PRACH configuration index sent by a base station, where the first
- the PRACH configuration index is used to indicate at least two types of PRACH resource configurations; and the first PRACH resource configuration is selected from the at least two types of PRACH resource configurations indicated by the first PRACH configuration index according to the channel feature value of the UE;
- the random access preamble is sent to the base station on the PRACH resource corresponding to the first PRACH resource configuration.
- the UE stores the random access configuration information, or the UE receives the random access configuration information sent by the network side device, where The random access configuration information reflects a correspondence between each PRACH configuration index of the at least one PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index.
- the at least two types of PRACH resource configurations indicated by each PRACH configuration index respectively correspond to one channel feature range
- the basis is Determining the first PRACH resource configuration from the at least two types of PRACH resource configurations indicated by the first PRACH configuration index, including: determining, according to the random access configuration information, the first PRACH configuration Determining the at least two types of PRACH resource configurations indicated by the index; determining, according to the channel feature value of the UE, a PRACH resource configuration corresponding to a channel feature range in which the channel feature value of the UE is located, as the first PRACH resource configuration .
- the UE stores, by using the corresponding relationship between the at least two types of PRACH resource configurations and channel feature ranges indicated by each of the PRACH configuration indexes Or the UE obtains, from the network side device, a correspondence between at least two types of PRACH resource configurations indicated by each of the PRACH configuration indexes and a channel feature range.
- the random access configuration information is a random access configuration table.
- the random access configuration information includes a correspondence between each PRACH resource configuration and a PRACH resource corresponding thereto.
- a method for receiving a random access preamble includes: The user equipment UE sends a first physical random access channel PRACH configuration index, where the first PRACH configuration index is used to indicate at least two PRACH resource configurations, so that the UE is from the first PRACH according to the channel feature value of the UE.
- the first PRACH resource configuration is selected from the at least two types of PRACH resource configurations indicated by the configuration index; the base station is in the at least two.
- the base station stores random access configuration information, where the random access configuration information reflects each of the at least one PRACH configuration PRACH configuration
- the at least two PRACH resource configurations indicated by each PRACH configuration index respectively correspond to one channel feature range.
- the method further includes: the base station sending, to the UE, at least two types of PRACHs indicated by each of the PRACH configuration indexes Correspondence between resource configuration and channel feature range.
- the random access configuration information is a random access configuration table.
- the random access configuration information includes a correspondence between the PRACH resource configuration and a PRACH resource corresponding thereto.
- a third aspect provides a user equipment, where the user equipment includes: a receiving unit, configured to receive a first physical random access channel PRACH configuration index sent by a base station, where the first PRACH configuration index is used to indicate at least two PRACHs a resource configuration, a selecting unit, configured to select a first PRACH resource configuration from the at least two types of PRACH resource configurations indicated by the first PRACH configuration index received by the receiving unit according to a channel feature value of the UE; And sending, by using the PRACH resource corresponding to the first PRACH resource configuration selected by the selecting unit, a random access preamble to the base station.
- the user equipment further includes a storage unit, where the storage unit is configured to store random access configuration information, or the receiving unit The method is further configured to receive random access configuration information sent by the network side device, where The random access configuration information reflects a correspondence between each PRACH configuration index of the at least one PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index.
- the at least two types of PRACH resource configurations indicated by each of the PRACH configuration indexes respectively correspond to one channel feature range
- the selecting unit is specific to And determining, according to the random access configuration information, the at least two types of PRACH resource configurations indicated by the first PRACH configuration index; determining, according to a channel feature value of the UE, a channel feature value of the UE
- the PRACH resource configuration corresponding to the channel feature range is configured as the first PRACH resource configuration.
- the storage unit is further configured to: store at least two PRACH resource configurations and channel characteristics indicated by each of the PRACH configuration indexes Corresponding relationship of the range, or the receiving unit is further configured to: acquire, from the network side device, a correspondence between at least two types of PRACH resource configurations indicated by each of the PRACH configuration indexes and a channel feature range.
- the random access configuration information is a random access configuration table.
- the random access configuration information includes a correspondence between each PRACH resource configuration and a PRACH resource corresponding thereto.
- a base station configured to send, to a user equipment UE, a first physical random access channel PRACH configuration index, where the first PRACH configuration index is used to indicate at least two PRACH resources
- the first PRACH resource configuration is selected from the at least two types of PRACH resource configurations indicated by the first PRACH configuration index, and the detecting unit is configured to be in the sending unit, according to the channel feature value of the UE.
- the random access preamble sent by the UE is detected on the PRACH resource corresponding to the at least two types of PRACH resource configurations indicated by the first PRACH configuration index.
- the base station further includes a storage unit, where the storage unit is configured to store random access configuration information, and the random access configuration The information reflects a correspondence between each PRACH configuration index in at least one PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index.
- the at least two PRACH resource configurations indicated by each PRACH configuration index respectively correspond to one Channel feature range.
- the sending unit is further configured to: send, to the UE, at least two types of PRACH resources indicated by each of the PRACH configuration indexes Configure the correspondence with the channel feature range.
- the random access configuration information is a random access configuration table.
- the random access configuration information includes a correspondence between each PRACH resource configuration and a PRACH resource corresponding thereto.
- a fifth aspect provides a user equipment, where the user equipment includes: a receiver, configured to receive a first physical random access channel PRACH configuration index sent by a base station, where the first PRACH configuration index is used to indicate at least two PRACHs a resource configuration, configured to: select, according to a channel feature value of the UE, a first PRACH resource configuration from the at least two types of PRACH resource configurations indicated by the first PRACH configuration index received by the receiver; And sending, to the base station, a random access preamble on a PRACH resource corresponding to the first PRACH resource configuration selected by the processor.
- the user equipment further includes a memory, where the memory is used to store random access configuration information, or the receiver is further used to Receiving the random access configuration information sent by the network side device, where the random access configuration information reflects a correspondence between each PRACH configuration index of the at least one PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index.
- the at least two types of PRACH resource configurations indicated by each of the PRACH configuration indexes respectively correspond to one channel feature range
- the processor is specific to And determining, according to the random access configuration information, the at least two types of PRACH resource configurations indicated by the first PRACH configuration index; determining, according to a channel feature value of the UE, a channel feature value of the UE
- the PRACH resource configuration corresponding to the channel feature range is configured as the first PRACH resource configuration.
- the memory stores a correspondence between at least two PRACH resource configurations indicated by each PRACH configuration index and a channel feature range, or
- the receiver is further configured to: obtain, by the network side device, at least two types of PRACH resource configurations and channel characteristics indicated by each of the PRACH configuration indexes The corresponding relationship.
- the random access configuration information is a random access configuration table.
- the random access configuration information includes a correspondence between each PRACH resource configuration and a PRACH resource corresponding thereto.
- a base station configured to send, to a user equipment UE, a first physical random access channel PRACH configuration index, where the first PRACH configuration index is used to indicate at least two PRACH resources. Configuring, in order for the UE to select a first PRACH resource configuration from the at least two PRACH resource configurations indicated by the first PRACH configuration index according to a channel feature value of the UE; a processor, configured to be in the transmitter Detecting a random access preamble sent by the UE on a PRACH resource corresponding to the at least two types of PRACH resource configurations indicated by the first PRACH configuration index.
- the base station further includes a memory, where the memory is used to store random access configuration information, and the random access configuration information reflects at least Correspondence between each PRACH configuration index in a PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index.
- the at least two PRACH resource configurations indicated by each PRACH configuration index respectively correspond to one channel feature range.
- the transmitter is further configured to: send, to the UE, at least two types of PRACH resources indicated by each of the PRACH configuration indexes Configure the correspondence with the channel feature range.
- the random access configuration information is a random access configuration table.
- the random access configuration information includes a correspondence between each PRACH resource configuration and a PRACH resource corresponding thereto.
- the UE in the embodiment of the present invention receives the PRACH configuration index sent by the base station, and one PRACH configuration index is used to indicate at least two types of PRACH resource configurations, and the UE indicates at least two types from the first PRACH configuration index according to the channel feature value of the UE.
- PRACH resource configuration The first PRACH resource configuration is selected, and the random access preamble is sent to the base station on the PRACH resource corresponding to the selected first PRACH resource configuration. Therefore, the UEs for different channel eigenvalues can determine the PRACH resources for transmitting the random access preamble corresponding to the channel feature values of the UE by using the same index, thereby improving the efficiency of PRACH resource configuration, and improving the base station receiving random access. The accuracy of the lead. DRAWINGS
- FIG. 1 is a flow chart of a method for configuring physical random access channel resources according to an embodiment of the present invention.
- FIG. 2A is a schematic diagram of a random access preamble format according to an embodiment of the present invention.
- 2B is a schematic diagram of a random access preamble format according to another embodiment of the present invention.
- FIG. 3A is a schematic diagram of bit indication of a PRACH resource location in accordance with an embodiment of the present invention.
- FIG. 3B is a schematic diagram of a bit indication of a PRACH resource location according to another embodiment of the present invention.
- FIG. 3C is a schematic diagram of a bit indication of a PRACH resource location according to still another embodiment of the present invention.
- 4 is a flow chart of a method for configuring physical random access channel resources according to another embodiment of the present invention.
- FIG. 5A is a schematic illustration of a bit indication of a PRACH resource location in accordance with yet another embodiment of the present invention.
- FIG. 5B is a schematic diagram of a bit indication of a PRACH resource location according to still another embodiment of the present invention.
- FIG. 6 is a structural block diagram of a user equipment according to an embodiment of the present invention.
- FIG. 7 is a structural block diagram of a base station according to an embodiment of the present invention.
- FIG. 8 is a block diagram of an apparatus in accordance with one embodiment of the present invention.
- FIG. 9 is a structural block diagram of a user equipment according to another embodiment of the present invention.
- FIG. 10 is a structural block diagram of a base station according to another embodiment of the present invention. detailed description
- the embodiment of the present invention fully considers that when the existing random access procedure transmits a preamble in certain channel environments, the base station cannot always receive or receive the problem of very low efficiency.
- Multiple (at least two) PRACH resource configurations are implemented according to different channel environments, so that the UE determines an appropriate PRACH resource configuration according to the channel feature value before transmitting the random access preamble, and then sends random access on the corresponding PRACH resource.
- the preamble solves the problem that the base station cannot always receive or receive very low efficiency when transmitting the preamble in some channel environments.
- GSM Global System of Mobile communication
- CDMA Code Division Multiple Access
- WCDMA Wideband Code Division Multiple Access
- GPRS General Packet Radio Service
- LTE Long Term Evolution
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- UMTS Universal Mobile Telecommunication System
- WiMAX Worldwide Interoperability for Microwave Access
- the UE may be referred to as a terminal, a mobile station (MS), a mobile terminal (Mobile Terminal), etc.
- the user equipment may be accessed via a radio access network (Radio Access).
- Network, RAN communicates with one or more core networks
- the user equipment may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, a Machine Type Communication (MTC) terminal, etc.
- MTC Machine Type Communication
- the user equipment can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges voice and/or data with the wireless access network.
- the base station may be a base station in GSM or CDMA (Base
- the Transceiver Station, BTS may also be a base station (NodeB, NB) in WCDMA, and may also be an eNodeB in LTE, but the present invention is not limited. However, for convenience of description, the following embodiments will be described by taking an eNodeB as an example. .
- the base station notifies the corresponding PRACH resource configuration of the UE by using the PRACH configuration index, and the corresponding relationship between the PRACH configuration index and the PRACH resource configuration indicated by the PRACH configuration index is pre-stored in the UE. And the UE can measure its channel characteristic value, and then root The appropriate PRACH resource configuration is selected according to the channel characteristic value.
- FIG. 1 is a flowchart of a method for transmitting a random access preamble according to an embodiment of the present invention. The method of Figure 1 is performed by a UE.
- the UE in the embodiment of the present invention receives the PRACH configuration index sent by the base station, and one PRACH configuration index is used to indicate at least two types of PRACH resource configurations, and the UE indicates at least two types from the first PRACH configuration index according to the channel feature value of the UE.
- the first PRACH resource configuration is selected in the PRACH resource configuration, and the random access preamble is sent to the base station on the PRACH resource corresponding to the selected first PRACH resource configuration. Therefore, the UEs for different channel eigenvalues can determine the PRACH resources for transmitting the random access preamble corresponding to the channel feature values of the UE by using the same index, thereby improving the efficiency of PRACH resource configuration, and improving the base station receiving random access. The accuracy of the lead.
- the channel feature may include one or more of the following: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), path loss, channel Channel Quality Indicator (CQI), etc.
- RSRP Reference Signal Received Power
- RSRQ Reference Signal Received Quality
- path loss path loss
- CQI channel Channel Quality Indicator
- the network side device may divide the channel feature value into N ranges, where N is a positive integer, and the N ranges correspond to different preamble formats.
- the channel feature range may also be a channel feature value.
- each range may also correspond to the number of repetitions of the sequence, and refers to the number of times each sequence is repeated.
- the network side device may send information about the N channel feature ranges to the UE.
- the UE may obtain N through one or more messages such as an RRC public message, a Media Access Control (MAC) control element (Control Element, CE) message, or a physical layer message sent by the received eNodeB.
- MAC Media Access Control
- CE Control Element
- the UE and the network side device may pre-arrange the index numbering of the N channel feature ranges.
- the path loss value is divided into four ranges, which are:
- the path loss range indicated by the range index 1 is x0 dB ⁇ the path loss value ⁇ xldB (corresponding to the preamble format 5 and the number of repetitions of the preamble format 5 is N1)
- the range index 2 indicates The path loss range is xldB ⁇ path loss value ⁇ x2dB (corresponding to preamble format 6 and the number of repetitions of preamble format 6 is N2)
- the path loss range indicated by range index 3 is x2dB ⁇ path loss value ⁇ x3dB (corresponding to preamble format 7 and The path loss range indicated by the preamble format 7 is N3) and the range index 4 is the path loss value > x3 dB (corresponding to the preamble format 8 and the number of repetitions of the preamble format 8 is N4)
- the range index 2 indicates The path loss range is
- random access preamble parameter corresponding to the preamble format may be expressed in a tabular form as shown in Table 2.
- the preamble formats 5-8 are the preamble formats newly defined corresponding to the four channel feature ranges in Table 1.
- the guard interval of the preamble format 5-8 may be 6048s*T s .
- the repetition number of the sequence is Ni
- the format in which the UE sends the random access preamble is as shown in FIG. 2A.
- the number of subframes occupied by one PRACH resource carrying the preamble of the preamble format with the number of repetitions of Ni can be expressed as:
- Mi ceil((Ni*24567*T s +6240*T s +6048s*T s ) * 1000)
- ceil() represents the rounding up operation.
- the number of subframes occupied by one PRACH resource carrying the preamble of format 5 is:
- Ml ceil((Nl*24567*T s +6240*T s +6048s*T s ) *1000)
- the format in which the UE sends the random access preamble may also be a repetition of the whole preamble and guard interval. As shown in Figure 2B. It should be understood that the embodiments of the present invention are not limited thereto. In this case, starting from one CP to the next first guard interval, it is called a part, and optionally, each part can be discontinuous in time. From the CP of the first part of the preamble format to the guard interval of the last part, the number of subframes included is one of the preamble formats.
- the number of subframes occupied by the PRACH resource is the number of subframes occupied by the PRACH resource.
- the number of repetitions may be predefined by the base station and the UE, for example, defined in a communication protocol specification, or the base station may display or implicitly notify the UE by signaling.
- the path loss value between the MTC UE and the base station will be additionally increased by 20 dB, using the prior art.
- the scheme transmitting a preamble of one of the formats 0-4 will cause the base station to fail to detect the preamble transmitted by the UE, or the probability of correct detection is very low even if the preamble transmitted by the UE is detected.
- the UE in the same cell adopts the corresponding PRACH preamble format and resource configuration according to the channel feature range in which the channel feature value is located.
- the UEs in different coverage areas adopt the path loss range according to the path loss value between the base station and the base station.
- Corresponding preamble format and The configuration of the PRACH resource can ensure the detection performance of the base station for the random access preamble in the scenario where the path loss is severe, and the same PRACH configuration index sent by the base station is used to indicate multiple PRACH resource configurations corresponding to the channel feature range. Therefore, the PRACH resources corresponding to the channel characteristics of the UE can be efficiently configured for the UE in the case of different channel characteristics.
- the UE may receive the first PRACH configuration index sent by the base station by using the RRC common signaling.
- the PRACH resource configuration indicated by the first PRACH configuration index may be a PRACH time domain resource configuration or a PRACH frequency domain resource configuration.
- the first PRACH configuration index indicates the PRACH time domain resource configuration of the preamble format 5-8, that is, one PRACH configuration index indicates the PRACH resource configuration of the four preamble formats, and the four PRACH resource configurations correspond to different channel feature ranges.
- the PRACH resources corresponding to at least two PRACH resource configurations may have a fixed difference or ratio between the predefined time lengths and/or frequency bandwidths.
- the number of PRACH resources corresponding to the first PRACH resource configuration in the at least two types of PRACH resource configurations is Num 1 and the number of PRACH resources corresponding to the second PRACH resource configuration is Num2, Numl and Num2.
- the ratio is fixed rl, or the difference between Numl and Num2 is fixed, and Numl and Num2 can be the same (ie, the difference is 0 or the ratio is 1) or different.
- the at least two PRACH resource configurations include a first PRACH resource configuration and a second PRACH resource configuration. If the channel feature value in the channel feature range corresponding to the first PRACH resource configuration is smaller than the channel feature value in the channel feature range corresponding to the second PRACH resource configuration, the first PRACH is within a predefined time length and/or frequency bandwidth. The number of PRACH resources corresponding to the resource configuration is greater than or equal to the number of PRACH resources corresponding to the second PRACH resource configuration.
- the path loss value of the path loss range ((xOdB, xldB)) corresponding to the PRACH resource configuration of the preamble format 5 is smaller than the path corresponding to the PRACH resource configuration of the preamble format 6.
- the path loss value of the loss range ((xldB, x2dB)), the number of PRACH resources corresponding to the PRACH resource configuration of the preamble format 5 is greater than or equal to the number of PRACH resources corresponding to the PRACH resource configuration of the preamble format 6.
- the embodiment of the present invention is not limited to this.
- the number of PRACH resources corresponding to the PRACH resource configuration corresponding to the smaller channel feature value may also be smaller than the corresponding channel.
- the PRACH resource configuration with large eigenvalues The number of PRACH resources.
- the UE may store random access configuration information (pre-arguing the random access configuration information with the base station), or the UE may receive a random transmission sent by the network side device (such as a base station or a controller, etc.).
- the random access configuration information reflects a correspondence between each PRACH configuration index in at least one PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index. Further, at least two PRACH resource configurations indicated by each PRACH configuration index respectively correspond to one channel feature range.
- the base station and the UE may pre-arrange the correspondence between the at least two PRACH resource configurations indicated by each PRACH configuration index and the channel feature range.
- the random access configuration information may further reflect a correspondence between at least two PRACH resource configurations indicated by each PRACH configuration index and a channel feature range.
- the UE may determine, according to the first PRACH configuration index, the at least two PRACH resource configurations indicated by the first PRACH configuration index by using the corresponding relationship reflected in the random access configuration information; determining, according to the channel feature value of the UE, The PRACH resource configuration corresponding to the channel feature range in which the channel feature value of the UE is located is configured as the first PRACH resource.
- the UE stores a correspondence between at least two PRACH resource configurations indicated by each PRACH configuration index and a channel feature range.
- the UE may also obtain, from the network side device, a correspondence between at least two PRACH resource configurations indicated by each of the PRACH configuration indexes and a channel feature range. It should be understood that the embodiment of the present invention does not limit this.
- the random access configuration information further includes a correspondence between the at least two PRACH configuration indexes and the indicated PRACH resource configuration, and the at least two PRACH configuration indexes include the foregoing first PRACH configuration index, and further includes a second PRACH configuration index, where Within a predefined time length and/or frequency bandwidth, the PRACH resource configuration indicated by the first PRACH configuration index and the PRACH resource configuration indicated by the second PRACH configuration index respectively have a fixed difference or ratio between the numbers.
- the number of PRACH resources corresponding to the PRACH resource configuration of the preamble format 5 indicated by the first PRACH configuration index is Num3, and the PRACH of the preamble format 5 indicated by the second configuration index
- the number of PRACH resources corresponding to the resource configuration is Num4, the ratio of Num3 to Num4 is fixed r2, or the difference between Num3 and Num4 is fixed, and Num3 and Num4 can be the same (that is, the difference is 0 or the ratio is 1) Or different.
- the PRACH resource corresponding to the PRACH resource configuration of the preamble format 5 indicated by the first PRACH configuration index has a pre-defined time length and/or a frequency bandwidth.
- the number of PRACH resources corresponding to the PRACH resource configuration of the preamble format 6 indicated by the second configuration index is Num5, the ratio of Num3 to Num5 is fixed r3, or the difference between Num3 and Num5 is fixed, Num3 It can be the same as Num5 (ie, the difference is 0 or the ratio is 1) or different. and many more.
- the information about the PRACH resource corresponding to each PRACH resource configuration may include at least one of the following: a random access preamble format, a version, a PRACH resource period, a start position of a PRACH resource period, a PRACH resource location, and a PRACH resource period.
- the random access configuration information may further include a correspondence between each PRACH resource configuration and information of the corresponding PRACH resource.
- the random access configuration table may also reflect a correspondence between each PRACH configuration index and a version in at least one PRACH configuration index.
- the random access configuration table further reflects a correspondence between each PRACH configuration index and a PRACH time domain resource location in the at least one PRACH configuration index. and many more. It is to be understood that the above examples are merely illustrative and are not intended to limit the scope of the invention.
- the offset may include one or more of the following: number of symbols, number of subframes, and time The number of slots, the number of frames, and so on.
- the offsets of the PRACH resources corresponding to different resource configurations corresponding to the first PRACH resource configuration may also have a fixed difference or ratio.
- the offset of the PRACH resource corresponding to the PRACH resource configuration of the preamble format 5 indicated by the first PRACH configuration index is K1 subframes
- the offset of the PRACH resource corresponding to the PRACH resource configuration of the preamble format 6 indicated by the first PRACH configuration index is For K2 subframes, the ratio of K1 to K2 is fixed r4, or the difference between K1 and K2 is fixed, and K1 and K2 may be the same (ie, the difference is 0 or the ratio is 1) or different.
- the density of PRACH resources corresponding to different PRACH resource configurations corresponding to the first PRACH resource configuration may be the same or different.
- the foregoing random access configuration information may be expressed in a table form.
- the UE may determine, by using the random access configuration information, at least two types of PRACH resource configurations corresponding to the first PRACH configuration index, and information of the PRACH resources corresponding to the PRACH resource configuration.
- the system frame number and the subframe number where the cycle start position of the PRACH time domain resource with the period of Mi*Sms is located may be determined in a predefined manner. For example, the following formula (1) is satisfied to determine the cycle start position of the PRACH time domain resource:
- the UE may determine, by using a bit indication in the random access configuration information, a location of the PRACH time domain resource corresponding to the PRACH time domain resource configuration.
- a PRACH time domain resource occupies M subframes, and the PRACH time domain resource takes a period of M*8ms, and uses a group of bits (such as 10000000) in a M*8ms PRACH time domain resource period.
- the location of the PRACH time domain resource is indicated, as shown in FIG. 3A, where 1 indicates that the corresponding M subframes are the locations of the PRACH time domain resources.
- a PRACH time domain resource occupies M subframes, and the PRACH time domain resource takes M*16ms as a period, and two sets of bits such as (such as 1000 and 01) are used in the M*16ms PRACH.
- the location of the PRACH time domain resource is indicated in the domain resource period. As shown in FIG. 3B, 1 in the bit 1000 corresponding to the bit 01 indicates that the corresponding M subframes are the locations of the PRACH time domain resource.
- the location of the PRACH time domain resource may also be determined by using a bit indication in the random access configuration information, and the preamble PRACH resource carrying the newly defined preamble format is mapped to the discontinuous subframe. As shown in FIG.
- D represents a downlink subframe
- U represents an uplink subframe
- S represents a TDD special subframe
- an uplink subframe (U) in a corresponding M subframes indicated by 1 is a location of the PRACH time domain resource. and many more.
- the PRACH frequency domain resource location may be determined by a PRACH frequency offset (prach-Frequency Offset) configured by an RRC common signaling plus a predefined offset, the predefined offset and the channel characteristics of the UE.
- the range of channel characteristics in which the value is located is related.
- the predefined offset may be expressed as a function of the index number corresponding to the channel feature range, and further may be expressed as a function of the index number corresponding to the channel feature range and the sequence number of the frequency resource.
- the sequence number of the first resource block (RB) that the PRACH frequency domain resource can occupy can be expressed as the following formula (2-1):
- ⁇ ⁇ indicates the PRACH frequency offset configured by the RRC common signaling for the preamble format 0-4, and I(s) is the channel characteristic range in which the channel eigenvalue of the UE is located.
- the function of index number s, eg I(s) sever Alternatively, / ⁇ can also be expressed as the following formula (2-2):
- + /'(s)*6 (2-2) ⁇ indicates a newly defined preamble format (such as a preamble format) by RRC common signaling.
- ⁇ can also be expressed as the following formula (3-1):
- N m is the channel feature range index number The number of frequency resource numbers of the preamble format corresponding to j.
- the maximum number of PRACH frequency domain resources of the newly defined preamble format in one subframe is The maximum value of the frequency resource number of the preamble format corresponding to the PRACH resource configuration is incremented by 1, that is, max (f RA ) +1.
- the method for determining the location of the PRACH frequency domain resource is not limited in the embodiment of the present invention, and the application scenario of the foregoing determining method is not limited, and may also be applied to the PRACH frequency domain resource occupation.
- the predefined offset may also be expressed as a function of other parameters than the above index number associated with the channel feature range.
- the UE may obtain a path loss value of the UE by using the following method: the UE measures the value of the RSRP, and obtains the downlink cell specificity sent by the eNodeB by using the System Information Block Type 2 (SIB2) The power of the reference signal Cell-specific Reference Signals (CRS), the UE calculates the difference between the power of the CRS and the value of the RSRP to obtain the path loss value of the UE.
- SIB2 System Information Block Type 2
- CRS Cell-specific Reference Signals
- FIG. 4 is a flow chart of a method for configuring physical random access channel resources according to another embodiment of the present invention.
- the method of Figure 4 is performed by a base station. And corresponds to the method of Fig. 1, and therefore the description overlapping with the embodiment of Fig. 1 will be omitted as appropriate.
- the base station sends a first physical random access channel PRACH configuration index to the user equipment UE, where the first PRACH configuration index is used to indicate at least two PRACH resource configurations, so that the UE indicates the first PRACH configuration index according to the channel characteristic value of the UE.
- the first PRACH resource configuration is selected from the at least two PRACH resource configurations.
- the base station detects a random access preamble sent by the UE on the PRACH resource corresponding to the at least two PRACH resource configurations.
- the base station sends a PRACH configuration index to all UEs in the cell, and a PRACH configuration index is used to indicate at least two PRACH resource configurations, so that the UE indicates from the first PRACH configuration index according to the channel feature value of the UE. Selecting the first PRACH resource configuration in the at least two PRACH resource configurations, in the selected first PRACH The random access preamble is sent to the base station on the PRACH resource corresponding to the resource configuration.
- the base station detects the random access preamble sent by the UEs with different channel eigenvalues on the PRACH resources corresponding to the at least two types of the PRACH resource configurations, thereby improving the efficiency of the PRACH resource configuration and improving the accuracy of the base station receiving the random access preamble.
- the channel feature may include one or more of the following: RSRP,
- the base station may send the first PRACH configuration index to the UE by using RRC common signaling.
- the PRACH resource configuration indicated by the first PRACH configuration index may be a PRACH time domain resource configuration or a PRACH frequency domain resource configuration.
- the PRACH resources corresponding to at least two PRACH resource configurations may have a fixed difference or ratio between the predefined time lengths and/or frequency bandwidths.
- the PRACH resources corresponding to at least two PRACH resource configurations may have a fixed difference or ratio between the predefined time lengths and/or frequency bandwidths.
- the at least two PRACH resource configurations include a first PRACH resource configuration and a second PRACH resource configuration. If the channel feature value in the channel feature range corresponding to the first PRACH resource configuration is smaller than the channel feature value in the channel feature range corresponding to the second PRACH resource configuration, the first PRACH is within a predefined time length and/or frequency bandwidth.
- the number of PRACH resources corresponding to the resource configuration is greater than or equal to the number of PRACH resources corresponding to the second PRACH resource configuration.
- the base station may store preset random access configuration information, and determine at least two PRACH resources by using a correspondence included in the random access configuration information according to the first PRACH configuration index.
- the random access configuration information reflects a correspondence between each PRACH configuration index in at least one PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index.
- the base station may send the random access configuration information to the UE, or the base station may pre-agreed the random access configuration information with the UE.
- the base station may send, to the UE, a correspondence between at least two PRACH resource configurations indicated by each PRACH configuration index and a channel feature range.
- the base station and the UE may pre-arrange the correspondence between the at least two PRACH resource configurations indicated by each PRACH configuration index and the channel feature range.
- the random access configuration information may further reflect a correspondence between at least two PRACH resource configurations indicated by each PRACH configuration index and a channel feature range.
- the random access configuration information further includes a correspondence between the at least two PRACH configuration indexes and the indicated PRACH resource configuration, and the at least two PRACH configuration indexes include the foregoing first PRACH configuration index, and further includes a second PRACH configuration index, where Within a predefined time length and/or frequency bandwidth, the PRACH resource configuration indicated by the first PRACH configuration index and the PRACH resource configuration indicated by the second PRACH configuration index respectively have a fixed difference or ratio between the numbers.
- the information about the PRACH resource corresponding to each PRACH resource configuration may include at least one of the following: a random access preamble format, a version, a PRACH resource period, a start position of a PRACH resource period, a PRACH resource location, and a PRACH resource period.
- the random access configuration information may further include a correspondence between each PRACH resource configuration and information of the corresponding PRACH resource.
- the random access configuration table may also reflect a correspondence between each PRACH configuration index and a version in at least one PRACH configuration index.
- the random access configuration table further reflects a correspondence between each PRACH configuration index and a PRACH time domain resource location in the at least one PRACH configuration index. and many more. It is to be understood that the above examples are merely illustrative and are not intended to limit the scope of the invention.
- the foregoing random access configuration information may be expressed in a table form.
- the base station may determine, by using the random access configuration information, at least two PRACH resource configurations corresponding to the first PRACH configuration index, and information of the PRACH resource corresponding to the PRACH resource configuration.
- the base station may determine the PRACH time domain resource location, the PRACH frequency domain resource location, and the PRACH time domain resource periodic start location, reference may be made to the foregoing embodiment, and details are not described herein again.
- the random access configuration information of the base station and the UE may be expressed in a tabular form as follows:
- a PRACH configuration index indicates a set of PRACH time domain resource configurations, and this set of PRACH time domain resource configurations Four PRACH time domain resource configurations are included.
- Each PRACH time domain resource configuration in a set of PRACH time domain resource configurations has a path loss range corresponding to one path loss range and different PRACH time domain resource configurations.
- the path loss ranges corresponding to the PRACH time domain resource configurations in Format 5-8 are shown in Table 1 and Table 2.
- the PRACH time domain resources corresponding to different PRACH time domain resource configurations indicated by one PRACH configuration index have the same density in the PRACH time domain resource period, for example, the preamble format indicated by the PRACH configuration index 0 is 5-8.
- the density of the PRACH time domain resources corresponding to the PRACH resource configuration is 1/8.
- the different PRACH time domain resource configurations indicated by one PRACH configuration index have the same version.
- the version of the PRACH time domain resource configuration of the preamble format 5-8 indicated by the PRACH configuration index 0 is 0.
- bit indication (such as PRACH The manner in which the bit of index 0 is configured to indicate 10000000) is used to determine the specific location of the PRACH time domain resource.
- the number of subframes occupied by one PRACH time domain resource of the preamble format 5-8 is M1, M2, M3 and M4, respectively, and the PRACH time domain resource periods are Ml*8ms, M2*8ms, M3*8ms and M4*8ms, respectively.
- a PRACH configuration index indicates a different length within a predefined length of time
- the PRACH time domain resource corresponding to the PRACH time domain resource configuration may have a fixed difference or ratio between the numbers. As shown in Table 3, within a predefined time length T, the ratio of the PRACH time domain resource configurations of the preamble formats 5-8 to the number of PRACH time domain resources respectively is 1/M1: 1/M2:1/M3: 1 /M4. 4) The predefined time length is 6720ms, and the values of Ml, M2, M3, and M4 are 4, 5, 6, and 7, respectively. Then, the PRACH time domain resource configurations of the preamble format 5-8 indicated by the PRACH configuration index 0 are respectively corresponding.
- the number of PRACH time domain resources has 210, 168, 140, and 120, and the ratio is 105:84:70:60, which is 1/4: 1/5:1/6:1/7;
- PRACH configuration index 8 The PRACH time domain resource configurations of the indicated preamble formats 5-8 correspond to the PRACH time domain resources respectively.
- the number of the resources is 420, 336, 280, and 240.
- the ratio is 105:84:70:60, which is 1/4: 1/5: 1 /6:1 ⁇ .
- the PRACH time domain resource configuration corresponding to the PRACH time domain resource configuration indicated by the different PRACH configuration indexes has a fixed difference or ratio between the numbers of the PRACH time domain resources.
- the PRACH time domain resource configuration of the preamble format 5 indicated by the PRACH configuration index 0 corresponds to the number of PRACH time domain resources having T/Ml*8ms, as indicated by the PRACH configuration index 8.
- the PRACH time domain resource configuration of the preamble format 5 corresponds to the PRACH time domain resource having a number of 2*T/M1*8ms, that is, the PRACH time domain resource configuration of the preamble format 5 indicated by the PRACH configuration index 0 and the PRACH configuration index 8, respectively.
- the PRACH time domain resource has a number ratio of 1:2.
- the first PRACH resource is within a predefined time length.
- the number of the corresponding PRACH time domain resources is greater than or equal to the number of PRACH time domain resources corresponding to the second PRACH resource configuration.
- the first PRACH resource configuration and the second PRACH resource configuration are indicated by the same PRACH configuration index.
- the path loss value of the path loss range ((xOdB, xldB)) corresponding to the PRACH time domain resource configuration of the preamble format 5 indicated by the PRACH configuration index 0 is smaller than the path corresponding to the PRACH time domain resource configuration of the preamble format 6.
- Path of loss range ((xldB, x2dB]) The value of the loss of the PRACH time domain resource corresponding to the PRACH time domain resource configuration of the preamble format 5 has a number T/Ml*8ms greater than or equal to the PRACH corresponding to the PRACH time domain resource configuration of the preamble format 6 in the predefined time length T.
- the time domain resource has a number T/M2*8ms, that is, Ml is less than or equal to M2. It should be understood that the embodiment of the present invention does not limit the number of PRACH time domain resources corresponding to the PRACH resource configuration with a smaller channel feature value, and may be smaller than the corresponding channel feature value. The number of PRACH time domain resources corresponding to a large PRACH resource configuration.
- the random access configuration information may further include a correspondence between each PRACH resource configuration and information of its corresponding PRACH resource.
- the information of the PRACH time domain resource corresponding to each PRACH resource configuration may include at least one of the following: a PRACH time domain resource period, a PRACH time domain resource period start position, a PRACH time domain resource location, and a PRACH time domain resource period start. The offset between the locations, the PRACH time domain resource location, the PRACH time domain resource size, the random access preamble format transmitted on the PRACH resource, the density of the PRACH time domain resource, the number of PRACH time domain resources, and the like.
- the determination of the starting position of the PRACH time domain resource period may be referred to the above formula (1), and details are not described herein again.
- the determination of the location of the PRACH time domain resource can be referred to the description of the embodiment of Figure 1 above, and will not be described in detail herein.
- the offset between the PRACH time domain resource location and the start position of the PRACH time domain resource period includes one or more of the following: number of symbols, number of subframes, number of slots, number of frames, and the like.
- the PRACH time domain resource bit corresponding to the PRACH time domain resource configuration of the preamble format 6 indicated by the PRACH configuration index 0 is 10000000, and the PRACH is in the PR2 time domain resource period of the M2*8 ms.
- the location of the domain resource is indicated, as shown in FIG.
- the PRACH time domain resource has a size of M2 subframes, and the offset between the PRACH time domain resource location and the start position of the PRACH time domain resource period is 0 subframes.
- the offset between the PRACH time domain resource location corresponding to the different PRACH time domain resource configuration and the start position of the PRACH time domain resource period indicated by the PRACH configuration index within a predefined length of time Has a fixed difference or ratio.
- the PRACH time domain resource configuration of the preamble format 5 indicated by the PRACH configuration index 2 corresponds to the offset of the PRACH time domain resource, which is indicated by the PRACH configuration index 2
- the PRACH time domain resource configuration of the preamble format 6 corresponds to the offset of the PRACH time domain resource.
- Ml*2 subframes the difference between the two offsets is 0 or the ratio is 1.
- the location of the PRACH frequency domain resource that is, the sequence number of the first RB that can be occupied by the PRACH frequency domain resource
- the base station sends a first PRACH configuration index (which may be any PRACH configuration index in Table 3) to all UEs in the cell through RRC common signaling.
- a first PRACH configuration index sent by the base station is 0, and the PRACH configuration index 0 indicates four PRACH resource configurations, that is, PRACH time domain resource configuration in the preamble format 5-8.
- a certain UE in the cell determines the PRACH time domain resource configuration of the preamble format 5-8 according to the PRACH configuration index 0 according to the correspondence included in Table 3.
- the path loss value of the UE path loss value is xldB ⁇
- the path loss value is ⁇ x2dB, and the UE sends a random access preamble to the base station on the PRACH resource corresponding to the PRACH time domain resource configuration of the preamble format 6 indicated by the PRACH configuration index 0.
- the base station can determine the PRACH time domain resource configuration of the preamble format 5-8 by using the correspondence relationship included in the table 3 according to the PRACH configuration index 0, and the PRACH time domain resource configuration in the preamble format 5-8 respectively
- the random access preamble sent by the UE is detected on the corresponding PRACH resource.
- the UE receives the PRACH configuration index sent by the base station, and one PRACH configuration index is used to indicate at least two PRACH resource configurations, and each of the at least two PRACH resource configurations corresponds to one channel feature range, and different PRACH resource configurations correspond to each other.
- the UE has different channel feature ranges, and the UE selects a first PRACH resource configuration corresponding to a channel feature range in which the channel feature value of the UE is located in the at least two PRACH resource configurations according to the PRACH configuration index, and the PRACH corresponding to the selected first PRACH resource configuration
- the resource transmits a random access preamble to the base station. Therefore, the UEs with different channel eigenvalues can determine the corresponding PRACH resources for transmitting the random access preamble through the same index, thereby improving the efficiency of the PRACH resource configuration and improving the accuracy of the base station receiving the random access preamble.
- the number of PRACH time domain resource configurations, the applied FDD system, the bit indication mode, and the like are merely exemplary and are not intended to limit the scope of the present invention.
- the random access configuration information of the base station and the UE may be expressed in the form of a table as follows: Table 4 Random access configuration information
- PRACH [preamble [preamble] [preamble format [preamble format, version PRACH profile, resource type, resource type, resource resource TRA time domain resource Index density density density location
- Time domain resource time domain resource, time domain resource bit
- the PRACH time domain resource configuration may use two sets of bit indications to determine the location of the corresponding PRACH time domain resource, for example, the PRACH time domain resource bit corresponding to the PRACH time domain resource configuration of the preamble format 7 indicated by the PRACH configuration index 3.
- the indication indicates the location of the PRACH time domain resource in the PRACH time domain resource period of M3*16ms, as shown in FIG. 5B, where 1 of the bit 1000 corresponding to bit 01 indicates the corresponding M3.
- the subframe is the location of the PRACH time domain resource.
- the PRACH frequency domain resource location that is, the sequence number of the first RB that can be occupied by the PRACH frequency domain resource
- the predefined random access configuration information of the base station and the UE may be expressed in the form of a table as follows:
- PRACH [preamble] [preamble [preamble] [preamble version PRACH profile, fRA, responsibilities, fRA, responsibilities, fRA, responsibilities, fRA, TRA time domain resource index source density source density source Density source density location
- the parameter ⁇ is also configured in Table 5, and ⁇ represents the frequency domain resource number.
- the PRACH frequency domain resource corresponding to the PRACH resource configuration of a newly defined preamble format has only one in one subframe, and in Table 5, It is allowed to have multiple PRACH frequency domain resources in one subframe, and at most max ( ) +1, that is, multiple users are allowed to transmit the preamble in one subframe at the same time.
- the max ( / SA ) of the PRACH resource configuration of the preamble format 5 indicated by the PRACH configuration index 17 is 3, that is, there are 4 PRACH frequency domain resources in one subframe.
- the PRACH configuration index indicates both the PRACH time domain resource configuration and the PRACH frequency domain resource configuration.
- the PRACH configuration index indicates that the PRACH time domain resource configuration can be specifically referred to the manners in Table 3 and Table 4, and details are not described herein again.
- the number of PRACH frequency domain resources corresponding to different PRACH frequency domain resource configurations indicated by one PRACH configuration index may have a fixed difference or ratio.
- the PRACH frequency domain resource configuration of the preamble format 5-8 indicated by the PRACH configuration index 17 has the same number of the PRACH frequency domain resources and is 4, that is, the ratio is 1:1: 1: 1.
- the PRACH frequency domain resource configuration of the preamble format 5-8 indicated by the PRACH configuration index 18 corresponds to the PRACH frequency domain resource having the number 4, 3, 2, and 1, respectively, that is, the ratio is 4:3:2:1.
- different PRACH configuration indexes indicate
- the PRACH frequency domain resource configuration respectively has a fixed difference or ratio between the number of PRACH frequency domain resources.
- the PRACH frequency domain resource configuration of the preamble format 5-8 indicated by the PRACH configuration index 0 has the same number of PRACH frequency domain resources and is 1
- the PRACH configuration index 1 indicates
- the PRACH frequency domain resource configuration of the preamble format 5-8 corresponds to the same number of PRACH frequency domain resources and is 1, that is, the number of PRACH frequency domain resources corresponding to any PRACH frequency domain resource configuration indicated by the PRACH configuration index 0 and the PRACH configuration.
- the ratio between the number of PRACH frequency domain resource configurations indicated by index 1 and the number of PRACH frequency domain resources is 1.
- the PRACH frequency domain resource configuration of the preamble format 5-8 indicated by the PRACH configuration index 16 has the same number of PRACH frequency domain resources and is 3, and the preamble format indicated by the PRACH configuration index 17
- the PRACH frequency domain resource configurations of 5-8 respectively have the same number of PRACH frequency domain resources and are 4, that is, the number of PRACH frequency domain resources corresponding to any PRACH frequency domain resource configuration indicated by the PRACH configuration index 16 and the PRACH configuration index 17
- the ratio of any of the indicated PRACH frequency domain resource configurations corresponding to the number of PRACH frequency domain resources is 3:4.
- the channel feature value in the channel feature range corresponding to the first PRACH resource configuration is configured
- the number of the PRACH frequency domain resources corresponding to the first PRACH resource configuration is greater than or equal to the second PRACH resource configuration, where the channel eigenvalues in the channel feature range corresponding to the second PRACH frequency domain resource configuration are smaller than the second PRACH resource configuration.
- the first PRACH resource configuration and the second PRACH resource configuration are indicated by the same PRACH configuration index.
- the path loss value of the path loss range ((xOdB, xldB)) corresponding to the PRACH frequency domain resource configuration of the preamble format 5 indicated by the PRACH configuration index 18 is smaller than the path corresponding to the PRACH frequency domain resource configuration of the preamble format 6.
- the path loss value of the loss range ((xldB, x2dB)) within the uplink bandwidth of the system, the PRACH frequency domain resource corresponding to the PRACH frequency domain resource configuration of the preamble format 5 has a number 4 greater than the PRACH frequency domain resource configuration of the preamble format 6.
- the corresponding PRACH frequency domain resource has a number of 3.
- the embodiment of the present invention does not limit this, and corresponds to a PRACH resource configuration with a small channel feature value within a predefined time length and/or frequency bandwidth.
- the number of PRACH frequency domain resources may also be smaller than the number of PRACH frequency domain resources corresponding to the PRACH resource configuration corresponding to the channel characteristic value.
- the method for determining the location of the PRACH frequency domain resource may refer to the above (3-1), (3-2), (5-1), (5-2). , no longer repeat here.
- the base station sends a first PRACH configuration index (which may be any PRACH configuration index in Table 5) to all UEs in the cell through RRC common signaling.
- the first PRACH configuration index sent by the base station is 16, and the PRACH configuration index 16 indicates four PRACH resource configurations, that is, PRACH time domain and frequency domain resource configuration in the preamble format 5-8.
- a certain UE in the cell determines the PRACH time domain and frequency domain resource configuration of the preamble format 5-8 according to the PRACH configuration index 16 according to the correspondence relationship included in Table 5, assuming the path loss range of the path loss value of the UE.
- the UE transmits a random access preamble to the base station on the PRACH resource corresponding to the PRACH time domain and the frequency domain resource configuration of the preamble format 6 indicated by the PRACH configuration index 16).
- the base station can determine the PRACH time domain and frequency domain resource configuration of the preamble format 5-8 according to the PRACH configuration index 16 by the correspondence included in the table 5, and the PRACH time domain in the preamble format 5-8.
- the random access preamble sent by the UE is detected on the PRACH resource corresponding to the frequency domain resource configuration respectively.
- the UE receives the PRACH configuration index sent by the base station, and one PRACH configuration index is used to indicate at least two PRACH resource configurations and each of the at least two PRACH resource configurations.
- the PRACH resource configuration respectively corresponds to one channel feature range, and different channel characteristics ranges corresponding to different PRACH resource configurations are different.
- the UE selects, according to the PRACH configuration index, a channel feature range corresponding to the channel feature value of the UE in at least two PRACH resource configurations.
- a PRACH resource configuration is configured to send a random access preamble to the base station on the PRACH resource corresponding to the selected first PRACH resource configuration. Therefore, the UEs with different channel eigenvalues can determine the corresponding PRACH resources for transmitting the random access preamble through the same index, thereby improving the efficiency of PRACH resource configuration and improving the accuracy of the base station receiving the random access preamble.
- FIG. 6 is a structural block diagram of a user equipment according to an embodiment of the present invention.
- the user equipment 600 includes a receiving unit 601, a selecting unit 602, and a transmitting unit 603.
- the receiving unit 601 is configured to receive a first PRACH configuration index sent by the base station, where the first PRACH configuration index is used to indicate at least two PRACH resource configurations.
- the selecting unit 602 is configured to select the first PRACH resource configuration from the at least two PRACH resource configurations indicated by the first PRACH configuration index received by the receiving unit 601 according to the channel characteristic value of the UE.
- the sending unit 603 is configured to send a random access preamble to the base station on the PRACH resource corresponding to the first PRACH resource configuration selected by the selecting unit 602.
- the UE in the embodiment of the present invention receives the PRACH configuration index sent by the base station, and the PRACH configuration index is used to indicate at least two PRACH resource configurations, and the UE is configured according to the UE.
- the channel characteristic value of the UE selects a first PRACH resource configuration from at least two PRACH resource configurations indicated by the first PRACH configuration index, and corresponds to the selected first PRACH resource configuration.
- a random access preamble is sent to the base station on the PRACH resource. Therefore, the UEs for different channel eigenvalues can determine the PRACH resources for transmitting the random access preamble corresponding to the channel feature values of the UE by using the same index, thereby improving the efficiency of PRACH resource configuration, and improving the base station receiving random access. The accuracy of the lead.
- the user equipment 600 can implement various steps involved in the user equipment in the methods of FIG. 1 to FIG. 5, and is not described in detail in order to avoid repetition.
- the channel feature may include one or more of the following: RSRP,
- the selecting unit 602 is further configured to obtain a channel feature value of the UE.
- the path loss value of the UE can be obtained by measuring the value of the RSRP and passing the SIB2.
- the power of the downlink CRS transmitted by the eNodeB is obtained, and the difference between the power of the CRS and the value of the RSRP is calculated to obtain a path loss value of the UE.
- the user equipment 600 may further include a storage unit 604, where the storage unit 604 is configured to store the preset random access configuration information, or the receiving unit 601 may further be configured to receive the Random access configuration information.
- the random access configuration information reflects a correspondence between each PRACH configuration index in at least one PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index.
- the random access configuration information may further reflect a corresponding relationship between the at least two PRACH resource configurations indicated by each PRACH configuration index and the channel feature range.
- the selecting unit 604 is specifically configured to: determine, according to the random access configuration information, the at least two types of PRACH resource configurations indicated by the first PRACH configuration index; and determine, according to the channel feature value of the UE, the channel feature range corresponding to the channel feature value of the UE.
- the PRACH resource configuration is configured as the first PRACH resource.
- the storage unit 604 stores a preset correspondence between the at least two PRACH resource configurations indicated by each of the preset PRACH configuration indexes and the channel feature range, or the receiving unit 601 may further be configured to acquire each PRACH configuration index from the network side device. At least two of the indications
- the information about the PRACH resource corresponding to each PRACH resource configuration may include at least one of the following: a random access preamble format, a version, a PRACH resource period, a start position of a PRACH resource period, a PRACH resource location, and a PRACH resource period.
- the random access configuration information may further include a correspondence between each PRACH resource configuration and information of the corresponding PRACH resource.
- the random access configuration table may also reflect a correspondence between each PRACH configuration index and a version in at least one PRACH configuration index.
- the random access configuration table further reflects a correspondence between each PRACH configuration index and a PRACH time domain resource location in the at least one PRACH configuration index. and many more. It is to be understood that the above examples are merely illustrative and are not intended to limit the scope of the invention.
- FIG. 7 is a structural block diagram of a base station according to an embodiment of the present invention.
- the base station 700 includes a transmitting unit 701 and a detecting unit 702.
- the sending unit 701 is configured to send, to the UE, a first PRACH configuration index, where the first PRACH configuration index is used to indicate at least two types of PRACH resource configurations, so that the UE is configured from the first PRACH configuration index according to the channel characteristic value of the UE.
- the first PRACH resource configuration is selected in the resource configuration.
- the detecting unit 702 is configured to detect, according to the PRACH resource corresponding to the at least two PRACH resource configurations indicated by the first PRACH configuration index sent by the sending unit 701, the random access preamble sent by the UE.
- the base station sends a message to all UEs in the cell according to the embodiment of the present invention.
- a PRACH configuration index where a PRACH configuration index is used to indicate at least two types of PRACH resource configurations, such that the UE selects a first PRACH resource configuration from at least two PRACH resource configurations indicated by the first PRACH configuration index according to a channel feature value of the UE.
- the random access preamble is sent to the base station on the PRACH resource corresponding to the first PRACH resource configuration.
- the base station detects the random access preamble sent by the UEs with different channel eigenvalues on the PRACH resources corresponding to the at least two PRACH resource configurations, thereby improving the efficiency of the PRACH resource configuration and improving the accuracy of the base station receiving the random access preamble.
- the base station 700 can implement the steps involved in the base station in the methods of FIGS. 1 through 5, and is not further evaluated to avoid repetition.
- the channel feature may include one or more of the following: RSRP,
- the base station may further include a storage unit 703, where the storage unit 703 is configured to store preset random access configuration information.
- the random access configuration information reflects a correspondence between each PRACH configuration index in at least one PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index. Further, at least two PRACH resource configurations indicated by each PRACH configuration index respectively correspond to one channel feature range.
- the sending unit 701 is further configured to send, to the UE, a correspondence between the at least two PRACH resource configurations indicated by each PRACH configuration index and the channel feature range.
- the base station and the UE may pre-arrange the correspondence between the at least two PRACH resource configurations indicated by each PRACH configuration index and the channel feature range. It should be understood that the embodiments of the present invention are This is not limited.
- the information about the PRACH resource corresponding to each PRACH resource configuration may include at least one of the following: a random access preamble format, a version, a PRACH resource period, a start position of a PRACH resource period, a PRACH resource location, and a PRACH resource period.
- the random access configuration information may further include a correspondence between each PRACH resource configuration and information of the corresponding PRACH resource.
- the random access configuration table may also reflect a correspondence between each PRACH configuration index and a version in at least one PRACH configuration index.
- the random access configuration table further reflects a correspondence between each PRACH configuration index and a PRACH time domain resource location in the at least one PRACH configuration index. and many more. It is to be understood that the above examples are merely illustrative and are not intended to limit the scope of the invention.
- FIG. 8 shows an embodiment of a device, in which the device 800 includes a processor 801, a memory 802, a transmitter 803, and a receiver 804.
- the processor 801 controls the operation of the device 800, which may also be referred to as a CPU (Central Processing Unit).
- Memory 802 can include read only memory and random access memory and provides instructions and data to processor 801.
- a portion of memory 802 may also include non-volatile line random access memory (NVRAM).
- the processor 801, the memory 802, the transmitter 803 and the receiver 804 are coupled together by a bus system 810, wherein the bus system 810 includes a power bus, a control bus, and a status signal bus in addition to the data bus.
- bus system 810 includes a power bus, a control bus, and a status signal bus in addition to the data bus.
- various buses are labeled as bus system 810 in the figure.
- the above-described device 800 can be applied to the method disclosed in the above embodiments of the present invention.
- the 801 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 801 or an instruction in the form of software.
- FIG. 9 is a structural block diagram of a user equipment according to an embodiment of the present invention.
- User equipment 900 includes a receiver 901, a processor 902, and a transmitter 903.
- the receiver 901 is configured to receive a first PRACH configuration index sent by the base station, where the first PRACH The configuration index is used to indicate at least two PRACH resource configurations.
- the processor 902 is configured to select a first PRACH resource configuration from the at least two PRACH resource configurations indicated by the first PRACH configuration index received by the receiver 901 according to the channel feature value of the UE.
- a transmitter 903 configured to correspond to the first PRACH resource configuration selected by the processor 902
- a random access preamble is sent to the base station on the PRACH resource.
- the UE in the embodiment of the present invention receives the PRACH configuration index sent by the base station, and one PRACH configuration index is used to indicate at least two types of PRACH resource configurations, and the UE indicates at least two types from the first PRACH configuration index according to the channel feature value of the UE.
- the first PRACH resource configuration is selected in the PRACH resource configuration, and the random access preamble is sent to the base station on the PRACH resource corresponding to the selected first PRACH resource configuration. Therefore, the UEs for different channel eigenvalues can determine the PRACH resources for transmitting the random access preamble corresponding to the channel feature values of the UE by using the same index, thereby improving the efficiency of PRACH resource configuration, and improving the base station receiving random access. The accuracy of the lead.
- the user equipment 900 can implement various steps involved in the user equipment in the methods of FIG. 1 to FIG. 5, and is not described in detail in order to avoid repetition.
- the channel characteristics may include one or more of the following: RSRP, RSRQ, path loss, CQI, and the like. It should be understood that the embodiments of the present invention are not limited thereto.
- the processor 902 is further configured to acquire a channel feature value of the UE.
- the path loss value of the UE may be obtained by: obtaining the value of the RSRP, obtaining the power of the downlink CRS sent by the eNodeB through the SIB2, and calculating the path loss value of the UE by calculating the difference between the power of the CRS and the value of the RSRP.
- the user equipment 900 may further include a memory, where the memory 904 is configured to store preset random access configuration information, or the receiver 901 may be further configured to receive a random access configuration sent by the network side device. information.
- the random access configuration information reflects a correspondence between each PRACH configuration in the at least one PRACH configuration index and at least two PRACH resource configurations indicated by the PRACH configuration index. Further, at least two PRACH resource configurations indicated by each PRACH configuration index respectively correspond to one channel feature range.
- the random access configuration information may further reflect a correspondence between at least two PRACH resource configurations indicated by each PRACH configuration index and a channel feature range.
- the processor 902 is specifically used And determining, according to the random access configuration information, the at least two PRACH resource configurations indicated by the first PRACH configuration index, and determining, according to the channel feature value of the UE, the PRACH resource configuration corresponding to the channel feature range in which the channel feature value of the UE is located, As the first PRACH resource configuration.
- the memory 904 stores a preset correspondence between the at least two types of PRACH resource configurations indicated by each PRACH configuration index and the channel feature range, or the receiver 901 can also be configured to acquire each PRACH configuration index from the network side device. Corresponding relationship between the indicated at least two types of PRACH resource configurations and channel feature ranges.
- the information about the PRACH resource corresponding to each PRACH resource configuration may include at least one of the following: a random access preamble format, a version, a PRACH resource period, a start position of a PRACH resource period, a PRACH resource location, and a PRACH resource period.
- the random access configuration information may further include a correspondence between each PRACH resource configuration and information of the corresponding PRACH resource.
- the random access configuration table may also reflect a correspondence between each PRACH configuration index and a version in at least one PRACH configuration index.
- the random access configuration table further reflects a correspondence between each PRACH configuration index and a PRACH time domain resource location in the at least one PRACH configuration index. and many more. It is to be understood that the above examples are merely illustrative and are not intended to limit the scope of the invention.
- the foregoing random access configuration information may be expressed in a table form.
- FIG. 10 is a structural block diagram of a base station according to an embodiment of the present invention.
- Base station 1000 includes a transmitter 1001 and a processor 1002.
- the transmitter 1001 is configured to send a first PRACH configuration index to the UE, where the first PRACH configuration index is used to indicate at least two types of PRACH resource configurations, so that the UE is configured from the first PRACH configuration index according to the channel characteristic value of the UE.
- the first PRACH resource configuration is selected in the resource configuration.
- the processor 1002 is configured to detect, according to the PRACH resource corresponding to the at least two PRACH resource configurations indicated by the first PRACH configuration index sent by the transmitter 1001, the random access preamble sent by the UE.
- the base station sends a message to all UEs in the cell according to the embodiment of the present invention.
- a PRACH configuration index is used to indicate at least two PRACH resource allocations
- the UE is configured to select a first PRACH resource configuration from the at least two PRACH resource configurations indicated by the first PRACH configuration index according to the channel feature value of the UE, and send the random connection to the base station on the PRACH resource corresponding to the selected first PRACH resource configuration. Enter the lead.
- the base station detects the random access preamble sent by the UEs with different channel eigenvalues on the PRACH resources corresponding to the at least two types of the PRACH resource configurations, thereby improving the efficiency of the PRACH resource configuration and improving the accuracy of the base station receiving the random access preamble.
- the base station 1000 can implement the steps involved in the base station in the methods of Figs. 1 to 5, and will not be described in detail in order to avoid redundancy.
- the channel characteristics may include one or more of the following: RSRP, RSRQ, path loss, CQI, and the like. It should be understood that the embodiments of the present invention are not limited thereto.
- the base station 1000 may further include a memory 1003, where the memory 1003 is configured to store preset random access configuration information, where the random access configuration information reflects each PRACH configuration index in the at least one PRACH configuration index. Correspondence of at least two PRACH resource configurations indicated. Further, at least two PRACH resource configurations indicated by each PRACH configuration index respectively correspond to one channel feature range.
- the transmitter 1001 is further configured to send, to the UE, a correspondence between at least two PRACH resource configurations indicated by each PRACH configuration index and a channel feature range.
- the base station and the UE may pre-arrange the correspondence between the at least two PRACH resource configurations indicated by each PRACH configuration index and the channel feature range. It should be understood that the embodiments of the present invention do not limit this.
- the information about the PRACH resource corresponding to each PRACH resource configuration may include at least one of the following: a random access preamble format, a version, a PRACH resource period, a start position of a PRACH resource period, a PRACH resource location, and a PRACH resource period.
- the random access configuration information may further include a correspondence between each PRACH resource configuration and information of the corresponding PRACH resource.
- the random access configuration table may also reflect the correspondence between each PRACH configuration and the version in at least one PRACH configuration.
- the random access configuration table further reflects each PRACH configuration index in the at least one PRACH configuration index. Correspondence with the location of the PRACH time domain resource. and many more. It is to be understood that the above examples are merely illustrative and are not intended to limit the scope of the invention.
- the foregoing random access configuration information may be expressed in a table form.
- the disclosed systems, devices, and methods may be implemented in other ways.
- the device embodiments described above are merely illustrative.
- the division of the unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
- the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
- each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
- the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
- a computer readable storage medium including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the present invention. All or part of the steps of the method described in the various embodiments are invented.
- the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .
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Abstract
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Priority Applications (5)
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EP13881954.5A EP2966920A4 (en) | 2013-04-08 | 2013-04-08 | METHOD FOR TRANSMITTING AND RECEIVING A RANDOM ACCESS PREAMBLE, AND CORRESPONDING DEVICE |
CN201380002043.7A CN104221454A (zh) | 2013-04-08 | 2013-04-08 | 随机接入前导的发送与接收方法、以及相应的设备 |
PCT/CN2013/073876 WO2014166046A1 (zh) | 2013-04-08 | 2013-04-08 | 随机接入前导的发送与接收方法、以及相应的设备 |
BR112015025597A BR112015025597A2 (pt) | 2013-04-08 | 2013-04-08 | método para enviar e receber preâmbulo de acesso aleatório, equipamento de usuário e estação base |
US14/870,216 US20160021681A1 (en) | 2013-04-08 | 2015-09-30 | Method for sending and receiving random access preamble, and corresponding device |
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Also Published As
Publication number | Publication date |
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EP2966920A1 (en) | 2016-01-13 |
EP2966920A4 (en) | 2016-03-16 |
BR112015025597A2 (pt) | 2017-07-18 |
US20160021681A1 (en) | 2016-01-21 |
CN104221454A (zh) | 2014-12-17 |
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