CN116437492A - Random access method and device and method and device for distributing random access resources - Google Patents

Random access method and device and method and device for distributing random access resources Download PDF

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Publication number
CN116437492A
CN116437492A CN202310272770.0A CN202310272770A CN116437492A CN 116437492 A CN116437492 A CN 116437492A CN 202310272770 A CN202310272770 A CN 202310272770A CN 116437492 A CN116437492 A CN 116437492A
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random access
beam reciprocity
terminal
reciprocity capability
preamble sequence
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钱辰
喻斌
熊琦
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A random access method and apparatus and a method and apparatus for allocating random access resources are provided. The random access method of the terminal comprises the following steps: when random access is carried out, if random access response is successfully detected, a message 3 containing an indication of the beam reciprocity capability of the terminal is sent; and detecting the conflict resolution information to complete the random access.

Description

Random access method and device and method and device for distributing random access resources
The present application is a divisional application of the invention patent application with application number 201710182283.X, 24 d 3 in 2017.
Technical Field
The present disclosure relates to the field of wireless communications technologies, and in particular, to a notification method for beam reciprocity capability of a terminal.
Background
With the rapid development of the information industry, especially the growing demand from the mobile internet and internet of things (IoT, internet of things), the future mobile communication technology is challenged unprecedented. As per the international telecommunications union ITU report ITU-R M [ imt. Beyond 2020.Traffic ], it is expected that in 2020, mobile traffic will increase approximately 1000 times as compared to 2010 (4G age), the number of user equipment connections will also exceed 170 billions, and the number of connected devices will be even more dramatic as the vast number of IoT devices gradually penetrate into the mobile communication network. To address this unprecedented challenge, the communications industry and academia have developed a wide range of fifth generation mobile communication technology research (5G) to face the 2020 s. The framework and overall goals of future 5G have been discussed in ITU report ITU-R M [ imt.vision ], where the requirements expectations, application scenarios and important performance metrics of 5G are specified. For new demands in 5G, ITU report ITU-R M [ imt.future TECHNOLOGY TRENDS ] provides information about technical trends for 5G, aiming at solving the problems of significant improvement of system throughput, user experience consistency, scalability, etc. to support IoT, latency, energy efficiency, cost, network flexibility, emerging services, flexible spectrum utilization, etc.
Millimeter wave communication is a key technology that is possible with 5G. By increasing the carrier frequency to the millimeter wave frequency band, the available bandwidth will be greatly increased, and thus the transmission rate of the system can be greatly increased. To combat the high fading, high loss, etc. characteristics of millimeter wave band wireless channels, millimeter wave communication systems typically employ Beamforming (Beamforming) techniques, i.e., by using weighting factors to concentrate the beam energy in a certain direction. When the wireless communication is carried out, the base station and the user search out the optimal beam pair by means of polling and the like, so that the receiving signal-to-noise ratio of the user side is maximized.
In millimeter wave systems, beam reciprocity is defined such that the direction of the receive beam that can achieve the maximum beamforming gain is the same as the direction of the transmit beam that can achieve the maximum beamforming gain. When the terminal and the base station do not have beam reciprocity, the terminal and the base station need to traverse all possible beam pairs to find the beam pair with the largest beam forming gain; when the terminal or the base station has beam reciprocity, the beam management or the beam direction correction flow can be greatly simplified, and the terminal and the base station can obtain the beam pairing with the maximum beam forming gain without traversing all possible beam pairing.
Whether a terminal has beam reciprocity can be considered to be the capability of the terminal for the base station. If the base station can timely acquire whether the terminal has beam reciprocity when or after the terminal is accessed, appropriate time-frequency resources can be allocated to the terminal in the processes of resource allocation, beam management, beam correction, cell switching and the like, so that the waste of system resources is avoided, and the resource utilization efficiency is improved.
In the existing millimeter wave system, proper signaling and flow are not used for informing the base station of the beam reciprocity capability of the terminal, so that the resource utilization efficiency of the existing millimeter wave system is low, and the resources cannot be reasonably allocated according to the beam reciprocity capability of the terminal.
Disclosure of Invention
The invention aims at the problem that in the existing millimeter wave system, no proper signaling and flow are used for informing the beam reciprocity capability of the base station by the terminal, so that the operation resource utilization rate and the working efficiency of resource allocation, beam management, beam correction and the like in the existing multi-beam operation system are lower, and new signaling and flow are needed for informing the beam reciprocity capability of the terminal, so that the working efficiency and the resource utilization rate of the system are improved.
The invention provides an indication mode of terminal beam reciprocity capability. Specifically, in the random access procedure, the beam reciprocity capability of the base station terminal is notified by the transmission of the message 3 or the selection of the random access resource. When the terminal completes the random access process, the base station can acquire the beam reciprocity capability of the terminal.
Compared with the prior art, the method provided by the invention has the advantages that the base station can acquire the beam reciprocity capability of the terminal when the terminal is accessed, so that the beam reciprocity capability of the terminal can be utilized to improve the operation efficiency of the system in the subsequent operation. For example, the base station can more effectively allocate time-frequency resources for the terminal in the multi-beam operation, more effectively perform operations such as beam management and beam direction correction, and more effectively complete procedures such as cell switching through interaction between the base stations.
According to an aspect of the present invention, there is provided a random access method of a terminal, including the steps of: when random access is carried out, if random access response is successfully detected, a message 3 containing an indication of the beam reciprocity capability of the terminal is sent; and detecting the conflict resolution information to complete the random access.
The random access method of the terminal further comprises the following steps: acquiring random access configuration information, wherein the random access configuration information comprises random access channel configuration and preamble sequence resource pool information; determining a random access channel and a preamble sequence according to the random access channel configuration and the preamble sequence resource pool information, and transmitting the preamble sequence on the random access channel; and if the random access response is detected within the random access response window and a preamble identifier matched with the transmitted preamble is detected in the random access response, successfully detecting the random access response.
Wherein beam reciprocity capability is indicated by at least a 1-bit indicator.
Wherein the transmitted message 3 includes at least a beam reciprocity capability indication field, an RRC connection request field; or wherein the RRC connection request field of the transmitted message 3 includes a beam reciprocity capability indication field.
Wherein the transmitted message 3 is channel-coded before the message 3 is transmitted, a CRC check code is added, and a mask corresponding to beam reciprocity capability is added on the basis of the CRC check code.
Wherein the beam reciprocity capability comprises: the method has no beam reciprocity and complete beam reciprocity.
Wherein the beam reciprocity capability comprises: the system has no beam reciprocity, complete beam reciprocity and partial beam reciprocity.
According to another aspect of the present invention, there is provided a random access method of a base station, comprising the steps of: after sending the random access response, detecting a message 3 containing an indication of the terminal beam reciprocity capability; and transmitting conflict resolution information according to the competition result.
The random access method of the base station further comprises the following steps: before sending a random access response, sending random access configuration information, wherein the random access configuration information comprises random access channel configuration and preamble sequence resource pool information; detecting a random access preamble sequence on the configured random access channel; and determining a random access response according to the detected random access preamble sequence information and transmitting the random access response.
According to another aspect of the present invention, there is provided a random access apparatus of a terminal, including: the message 3 generating and transmitting module generates and transmits a message 3 containing an indication that the terminal has beam reciprocity capability; and a collision resolution receiving module detecting the collision resolution information to complete the random access.
The random access device of the terminal further comprises: the configuration information acquisition module acquires random access configuration information, wherein the random access configuration information comprises random access channel configuration and preamble sequence resource pool information; the preamble sequence sending module is used for determining a random access channel and a preamble sequence according to the random access channel configuration and the preamble sequence resource pool information and sending a random access preamble sequence signal on the random access channel; and a random access response detection module for detecting the random access response sent by the base station in the random access response window, and if the preamble sequence identifier matched with the sent preamble sequence is detected in the random access response, the random access response is considered to be successfully detected, and the message 3 is acquired from the random access response.
According to another aspect of the present invention, there is provided a random access apparatus of a base station, comprising: a message detection module, configured to detect a message 3 including an indication of beam reciprocity capability of the terminal after sending the random access response; and the conflict resolution module is used for sending conflict resolution information according to the competition result.
The random access device of the base station further comprises: a random access configuration information sending module, configured to send random access configuration information, where the random access configuration information includes random access channel configuration and preamble sequence resource pool information; a random access preamble sequence detection module, configured to detect a random access preamble sequence on a configured random access channel; and a random access response transmitting module for determining a random access response according to the detected random access preamble sequence information and transmitting the random access response.
According to another aspect of the present invention, there is provided a method for a terminal to determine random access resources, comprising the steps of: acquiring random access resource configuration information, wherein the random access resource configuration information comprises random access resource subset configuration conditions distributed to terminals with different beam reciprocity capabilities, and the random access resources of the terminals with different beam reciprocity capabilities comprise one of random access channel time-frequency resources and preamble sequence resource pool information; selecting a corresponding random access resource subset according to the beam reciprocity capability of the terminal, wherein the selected random access resource subset comprises random access channel time-frequency resources suitable for the terminal with the beam reciprocity capability or preamble sequence resources suitable for the terminal with the beam reciprocity capability; the terminal generates a preamble sequence according to the preamble sequence resource information and transmits the preamble sequence on a random access channel time-frequency resource; and completing the subsequent random access process.
The random access resource is divided into a plurality of mutually disjoint resource subsets according to the number value of the subsets representing the beam reciprocity capability of the terminal, and each subset corresponds to one type of beam reciprocity capability.
Wherein the preamble sequence of the terminal is configured by one of the following ways: mode one: configuring a preamble sequence of the terminal by indicating an initial preamble sequence index of a first preamble sequence subset and the number of preamble sequences in each preamble sequence subset; mode two: configuring a preamble sequence of the terminal by indicating an initial preamble sequence index and a total number of preamble sequences of each preamble sequence subset; mode three: the preamble sequence of the terminal is configured by indicating a first sequence index in a base sequence resource pool, the number of sequences in the base sequence pool, and a coverage code index range, wherein a subset of the preamble sequences of the terminal are formed as follows: all preamble sequence subsets adopt the same basic sequence pool, different preamble sequence subsets adopt different cover code words, wherein each preamble sequence subset consists of the same or different sequences in the basic sequence resource pool, a cyclic prefix is added before each sequence of each preamble sequence subset, a protection time is added after all sequences of each preamble sequence subset, and each element of each sequence of each preamble sequence subset is multiplied with a corresponding element in the cover code.
Wherein the beam reciprocity capability comprises: the method has no beam reciprocity and complete beam reciprocity.
Wherein the beam reciprocity capability comprises: the system has no beam reciprocity, complete beam reciprocity and partial beam reciprocity.
According to another aspect of the present invention, there is provided a method for a base station to allocate random access resources, comprising the steps of: transmitting random access resource configuration information, wherein the random access resource configuration information comprises random access resource subset configuration conditions allocated to terminals with different beam reciprocity capabilities, and the random access resources of the terminals with different beam reciprocity capabilities comprise one of random access channel time-frequency resources and preamble sequence resource pool information; detecting the sending of the preamble sequence, and determining the random access resource corresponding to the beam reciprocity capability; and completing the subsequent random access flow.
The method for allocating random access resources by the base station before sending the random access resource allocation information further comprises the following steps: and counting the quantity proportion of the terminals with complete beam reciprocity, the terminals without beam reciprocity and the terminals with partial beam reciprocity in the current cell so as to adjust the proportion of the random access resource subsets allocated to the terminals with different beam reciprocity and inform the random access resource subsets to the terminals with different beam reciprocity.
According to another aspect of the present invention, there is provided an apparatus for determining a random access resource by a terminal, including: a configuration information acquisition module, configured to acquire random access resource configuration information, where the random access resource configuration information includes random access resource subset configuration conditions allocated to terminals with different beam reciprocity capabilities, and the random access resources for the terminals with different beam reciprocity capabilities include one of random access channel time-frequency resources and preamble sequence resource pool information; the random access resource selection module selects a corresponding random access resource subset according to the beam reciprocity capability of the random access resource selection module, wherein the selected random access resource subset comprises random access channel time-frequency resources suitable for the terminal with the beam reciprocity capability or preamble sequence resources suitable for the terminal with the beam reciprocity capability; and a preamble sequence transmitting module for generating a preamble sequence according to the selected preamble sequence resource information and transmitting the preamble sequence on the random access channel.
According to another aspect of the present invention, there is provided an apparatus for allocating random access resources by a base station, including: a random access resource allocation information sending module, configured to send random access resource allocation information, where the random access resource allocation information includes a random access resource subset allocation situation allocated to terminals with different beam reciprocity capabilities, and the random access resource for the terminals with different beam reciprocity capabilities includes one of a random access channel time-frequency resource and a preamble sequence resource pool information; and a preamble sequence detection module for detecting the transmission of the preamble sequence and determining the random access resource corresponding to the beam reciprocity capability.
The device for allocating random access resources by the base station further comprises: the beam reciprocity capability statistics module is used for counting the proportion of the accessed terminal with each beam reciprocity capability; the random access resource allocation adjustment module is used for adjusting random access resource allocation information according to the proportion of the terminals with the beam reciprocity capabilities, which are obtained by the statistics module, wherein the random access resource allocation information comprises random access resource subset allocation conditions corresponding to different beam reciprocity capabilities and random access resources allocated to the terminals with different beam reciprocity capabilities, and the random access resources aiming at the terminals with different beam reciprocity capabilities comprise one of random access channel time-frequency resources and preamble sequence resource pool information; and a resource allocation information notifying module for notifying the terminal of the adjusted random access resource allocation information.
The invention provides a mode for informing the beam reciprocity capability of the terminal, and the terminal can report the beam reciprocity capability of the terminal when the access is completed by sending the message 3 in the random access process or selecting the random access resource, so that the base station can know the beam reciprocity capability information of the terminal as soon as possible. After the information is obtained, the base station can more effectively perform subsequent processes such as scheduling, resource allocation, beam management, beam correction and the like. By adopting the method provided by the invention, the working efficiency of the system can be improved, and the flows of resource allocation, beam management, beam correction and the like can be more effective.
Drawings
The foregoing and/or other aspects will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a flow of interaction between a base station and a terminal according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of the structure of a message 3 in mode 1 carrying beam reciprocity capability indication according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a terminal random access device according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of a random access apparatus of a base station according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of one possible resource allocation according to a second embodiment of the present invention;
fig. 6 is a diagram of one possible preamble sequence resource pool configuration and notification scheme according to a second embodiment of the present invention;
fig. 7 is another possible preamble sequence resource pool configuration and notification scheme according to a second embodiment of the invention;
fig. 8 is a schematic diagram of another possible preamble configuration using a cover code according to a second embodiment of the present invention;
fig. 9 is a block diagram of the preamble sequence of fig. 7 according to a second embodiment of the present invention;
fig. 10 is a schematic diagram of an interaction flow between a base station and a terminal according to a second embodiment of the present invention;
Fig. 11 is a flow chart illustrating a process of real-time adjustment of random access resources allocated to terminals with different beam reciprocity capabilities by a base station according to a second embodiment of the present invention;
fig. 12 is a schematic diagram of an apparatus for determining random access resources by a terminal according to a second embodiment of the present invention;
fig. 13 is a schematic diagram of an apparatus for allocating random access resources by a base station according to a second embodiment of the present invention;
fig. 14 is a schematic diagram of an apparatus for allocating random access resources by a base station according to a second embodiment of the present invention.
Detailed Description
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
First embodiment
In this embodiment, a method and apparatus for reporting terminal beam reciprocity capability will be described in connection with a specific wireless communication system, where information about the terminal beam reciprocity capability is explicitly carried through a message 3 in a random access procedure.
Fig. 1 is a flow of interaction between a base station and a terminal according to a first embodiment of the present invention. The wireless communication system of fig. 1 includes a terminal 110 and a base station 120 that communicate interactively.
In order to report the beam reciprocity capability of the terminal, the specific flow at the terminal side is as follows:
step 101: the terminal 110 acquires random access configuration information including random access channel configuration and preamble sequence resource pool information in a system information block (System Information Block, SIB).
Step 103: the terminal 110 determines a random access channel and a preamble sequence according to the random access channel configuration and the preamble sequence resource pool information, and transmits a random access preamble sequence signal on the random access channel. The preamble sequence is randomly selected from a preamble sequence resource pool configured by the base station with equal probability.
Step 105: after the terminal 110 sends the preamble sequence, detecting a random access response in a random access response window, if the random access response is successfully detected and a preamble sequence identifier matched with the sent preamble sequence is detected in the random access response, then considering that the random access response is successfully detected, and acquiring information such as uplink authorization, timing advance, temporary Cell radio network Temporary identifier (TC-RNTI) and the like of the message 3 from the random access response; if the random access response is not successfully detected in the random access response window or the preamble sequence identifier detected in the random access response is not matched with the transmitted preamble sequence, the random access is considered to be unsuccessful, and the random access attempt is carried out again after the power is adjusted or the wave beam is transmitted.
Step 107: the random access response is successfully detected, and the preamble identifier matched with the transmitted preamble is detected in the random access response, and the terminal 110 transmits the message 3 on the time-frequency resource designated by the uplink grant. The message 3 includes a unique terminal identifier and an indication of whether the terminal 110 has beam reciprocity.
Step 109: after the terminal 110 transmits the message 3, the collision resolution information is detected. If the unique terminal identifier contained in the conflict resolution information is matched with the unique terminal identifier, the conflict resolution of the terminal 110 is successful, and the random access is successful; if the message 3 fails to be sent or the unique terminal identifier included in the conflict resolution does not match the unique terminal identifier of the terminal 110, the conflict resolution of the terminal 110 fails, and the random access is retried after the power is adjusted or the beam is sent.
Correspondingly, in order to realize reporting of the beam reciprocity capability of the terminal, the specific flow at the base station side is as follows:
step 201: the base station 120 transmits random access configuration information including random access channel configuration and preamble sequence resource pool information in a System Information Block (SIB);
step 203: the base station 120 detects transmission of a random access preamble sequence on the configured random access channel;
Step 205: if the base station 120 detects the transmission of the preamble sequence, it determines each parameter in the random access response according to the detected preamble sequence, the delay of the detected preamble sequence, and the like, and transmits the random access response in the downlink shared channel after detecting the fixed or configured timing sequence of the random access channel of the preamble sequence.
Step 207: after sending the random access response, the base station 120 detects the message 3 on the uplink shared channel indicated by the resource allocation information in the uplink grant allocated in the random access response, and obtains the terminal beam reciprocity capability indication therein.
Step 209: the base station 120 transmits collision resolution information according to the competition result.
In the random access procedure, the beam reciprocity capability indication of the terminal is added in the message 3. The beam reciprocity capability indication is used to inform the base station whether the terminal has beam reciprocity.
Regarding beam reciprocity capability indication, one possible way is for the following case: the terminal either does not have beam reciprocity (i.e. the optimal transmit beam direction cannot be known from the optimal receive beam direction) or has complete beam reciprocity (i.e. the exact optimal transmit beam direction can be known from the optimal receive beam direction). In this case, the beam reciprocity capability indication may be implemented by 1-bit indication information, a value of 1-bit indication information being 1 indicating that the terminal has beam reciprocity, and a value of 0 indicating that the terminal does not have beam reciprocity.
With respect to beam reciprocity capability indication, another possible approach is for the following case: some terminals do not have beam reciprocity (i.e., the optimal transmit beam direction cannot be known through the optimal receive beam direction); some terminals have complete beam reciprocity (i.e., the exact optimal transmit beam direction can be known from the optimal receive beam direction); other terminals have partial beam reciprocity (i.e. an estimate of the optimal transmit beam direction is known from the optimal receive beam direction, and it is still necessary to scan the transmit beam in a specific beam direction range including the optimal receive beam direction to determine the exact transmit beam direction). In this case, the beam reciprocity capability indication cannot be indicated by 1-bit information, and a plurality of bits are required for the indication. One possible way of indication is as shown in table 1:
table 1: beam reciprocity capability indication scheme
Index (bit representation) Meaning of value
0(00) The terminal does not have beam reciprocity
1(01) The terminal has weak beam reciprocity
2(10) The terminal has strong beam reciprocity
3(11) The terminal has complete beam reciprocity
In the above example, two bits of information are used to inform the terminal of beam reciprocity capability, where 00 indicates that the terminal does not have beam reciprocity at all and 11 indicates that the terminal has full beam reciprocity. 01 indicates that the terminal has only weak partial beam reciprocity (i.e. after knowing the optimal reception beam direction, it still needs to scan the transmission beam in a larger beam direction range); 10 indicates that the terminal has strong partial beam reciprocity (i.e. after knowing the optimal receive beam direction, only the transmit beam scan needs to be performed in a small beam direction range).
Regarding the stronger partial beam reciprocity and weaker partial beam reciprocity, some preset criteria may be used for the determination. For example, one possible criterion is to set a scan angle threshold of the transmit beam direction that the terminal still needs to perform after learning the optimal receive beam, and if the transmit beam scan range that the terminal needs to perform exceeds the preset threshold, determine that the terminal has weaker partial beam reciprocity; if the scanning range of the transmission beam required by the terminal is not more than the preset threshold value, the terminal determines that the partial beam reciprocity is strong.
Another possible criterion for the above-mentioned determination of stronger partial beam reciprocity and weaker partial beam reciprocity is to make a determination according to the number of transmit beam directions that the terminal needs to scan. For example, the threshold of the number of transmission beams with the maximum transmission beam direction scanning still needed by the terminal after knowing the optimal reception beam is set. If the number of the transmission beams to be scanned by the terminal exceeds the preset threshold, judging that the terminal has weaker partial beam reciprocity; if the number of the transmission beams to be scanned by the terminal does not exceed the preset threshold, the terminal determines that the partial beam reciprocity is strong. The transmission beam may be a transmission beam of the terminal itself or a transmission beam having a predetermined standard beam width.
In the above examples, terminals with partial beam reciprocity are further subdivided into two or four classes. In other possible ways, terminals with partial beam reciprocity may be classified into one type only, or into more types. If subdivided into more categories, more bits are needed for an indication of beam reciprocity.
The structure of the message 3 carrying the beam reciprocity capability indication according to the invention may take the following three implementations.
Mode 1: a new field is added in message 3 for transmitting the beam reciprocity capability indication. That is, when the random access procedure is used for initial access, message 3 includes at least fields of beam reciprocity capability indication, RRC connection request (RRC connection request), etc. As shown in the figure 2 of the drawings,
fig. 2 is a schematic diagram of the structure of message 3 in mode 1 carrying the beam reciprocity capability indication according to the invention.
As shown in fig. 2, when the above-described mode 1 is adopted, the message 3 transmitted on the uplink shared channel includes a beam reciprocity capability indication field, an RRC connection request field, and other possible fields. It should be noted that the structure shown in fig. 2 is only a schematic diagram, and actual positions of the respective fields may vary.
Mode 2: a new field is added in the RRC connection request of message 3 for informing the terminal of beam reciprocity capability. The existing RRC connection request includes: terminal identification information (ue-Identity), establishment cause information (establishmentCause), and a reserved field. Wherein the terminal identification information is selected from the following two ways: the s-TMSI of the terminal is either a random value. The establishment cause information includes: emergency (emergency), high priority Access (highprioritaccess), mobile terminal Access (mt-Access), mobile originated signaling (mo-signaling), mobile originated data (mo-data), delay tolerant Access (delayotolerantaccess-v 1020), mobile originated voice communication (mo-VoiceCall-v 1280), and the like.
On the basis of these fields in the RRC connection request of message 3, a beam reciprocity capability indication field is added. For example, one possible beam reciprocity capability indication parameter is ue-beam capability, and possible types are no beam reciprocity (Non), full beam reciprocity (Full), and possible partial beam reciprocity (Perfect). The possible Partial beam reciprocity types may be further subdivided, for example into different Partial beam reciprocity classes (Partial-v 1, partial-v2, …).
In this way, the RRC connection request is written as follows:
Figure BDA0004135251220000111
mode 3: after the message 3 is transferred to the physical layer, the CRC check code is added after the information bit is subjected to channel coding, and a mask corresponding to the beam reciprocity capability one by one is added on the basis of the CRC check code to inform the beam reciprocity capability of the terminal. For example, a dedicated radio network temporary identity (Radio Network Temporary Identity, RNTI) is set for indicating terminal beam reciprocity capabilities.
One possible way is to define BC-RNTI (beam correspondence RNTI) for indicating terminal beam reciprocity capabilities. The BC-RNTI is a 16-bit sequence, and the value range is [ v1, v2 ]]Wherein v1 is the starting point of the range and v2 is the end of the range. The v1 is used to indicate that the terminal does not have terminal reciprocity, and the v2 is used to indicate that the terminal has full beam reciprocity. Other values within the range of values are used to represent different levels of partial beam reciprocity capability. Including the two cases of no beam reciprocity and complete beam reciprocity capability, the number of all possible beam reciprocity capability classes is N BC ＝v2-v1+1。
In this way, the base station, after detecting message 3 and performing channel decoding, uses N as described above BC A possible mask, one for one with beam reciprocity capability, descrambles the CRC and attempts to do a CRC check. If the CRC check is successful, the message 3 is successfully detected, and the beam reciprocity capability of the corresponding terminal is the beam reciprocity capability corresponding to the corresponding BC-RNTI used.
Fig. 3 is a schematic diagram of a random access apparatus of a terminal according to a first embodiment of the present invention. Referring to fig. 3, a random access apparatus of a terminal according to a first embodiment of the present invention includes: a configuration information obtaining module 310, configured to obtain random access configuration information carried by a main information block or a system information block indicated by the main information block in a broadcast channel, where the random access configuration information includes random access channel configuration and preamble sequence resource pool information; a preamble sequence transmitting module 320 for determining a random access channel and a preamble sequence according to the random access channel configuration and the preamble sequence resource pool information, and transmitting a random access preamble sequence signal on the random access channel; the random access response detection module 330 detects a random access response transmitted by the base station in a random access response window, and if a preamble identifier matched with the transmitted preamble is detected in the random access response, the random access response is considered to be successfully detected, and a message 3 is acquired from the random access response; a message 3 generating and transmitting module 340, configured to generate and transmit a message 3 including an indication of whether the terminal has beam reciprocity according to one of the above modes 1-3 according to the detected random access response and the beam reciprocity capability of the terminal; the collision resolution receiving module 350 detects and receives the collision resolution information, and completes the random access procedure.
Fig. 4 is a schematic diagram of a random access apparatus of a base station according to a first embodiment of the present invention. Referring to fig. 4, a random access apparatus of a base station according to a first embodiment of the present invention includes: a message detection module 401, configured to detect a message 3 including an indication of beam reciprocity capability of the terminal after sending the random access response; and a conflict resolution module 403, configured to send conflict resolution information according to the competition result. The random access device of the base station according to the first embodiment of the present invention further includes: a random access configuration information sending module 405, configured to send random access configuration information, where the random access configuration information includes random access channel configuration and preamble sequence resource pool information; a random access preamble sequence detection module 407, configured to detect a random access preamble sequence on a configured random access channel; and a random access response transmitting module 409 configured to determine a random access response according to the detected random access preamble sequence information and transmit the random access response.
According to the first embodiment of the invention, through sending the message 3 in the random access process, the terminal can report the beam reciprocity capability of the terminal when the access is completed, so that the base station can know the beam reciprocity capability information of the terminal as soon as possible. After the information is obtained, the base station can more effectively perform subsequent processes such as scheduling, resource allocation, beam management, beam correction and the like. By adopting the method provided by the first embodiment of the invention, the working efficiency of the system can be improved, and the processes of resource allocation, beam management, beam correction and the like can be more effective.
Second embodiment
In a second embodiment, a notification manner of beam reciprocity capability will be described in connection with a specific wireless communication system, wherein beam reciprocity capability is implicitly notified through the random access resources used. Different beam reciprocity capabilities of the terminals are distinguished, for example, based on random access channel time-frequency resources or based on random access preamble sequences.
Fig. 5 is a schematic diagram of a possible resource allocation according to a second embodiment of the present invention, in which different beam reciprocity capabilities of terminals are distinguished by a resource partitioning method based on time-frequency resources of a random access channel.
In a wireless communication system, a parameter N is predefined BC A quantity value representing a subset of terminal beam reciprocity capabilities, where N BC ≥1。N BC When=1, the system does not distinguish between terminals with and without beam reciprocity capability, i.e. the number of subsets is 1; n (N) BC =2 means that the system only distinguishes between having full beam reciprocity and not having beam reciprocity, i.e. the number of subsets is 2, wherein terminals that cannot directly determine the optimal transmit beam direction by the optimal receive beam are all considered to not have beam reciprocity; n (N) BC Terminals where > 2 represents the system distinguishing partial beam reciprocity, i.e. the number of subsets is N BC And distinguishing the terminals with different partial beam reciprocity capability according to the required transmitting beam scanning range or the transmitting beam scanning number after the optimal receiving beam is acquired by the terminals.
The base station is based on N BC Dividing random access resource into N BC And resource subsets which are mutually disjoint, wherein each subset corresponds to a type of beam reciprocity capability. The base station transmits the N BC When accessing channels randomlyThe subset of frequency resources is communicated to the terminal via a broadcast channel, or a primary information block in the broadcast channel, or a system information block indicated by the primary information block in the broadcast channel.
In the example shown in fig. 5, the random access channel time-frequency resources allocated to terminals with different beam reciprocity capabilities are divided in a frequency division manner.
In fig. 5, the number of subsets of terminal beam reciprocity capabilities is N BC The 1 st subset is a terminal with beam reciprocity capability 1, namely a terminal with complete beam reciprocity; nth (N) BC The subset is provided with beam reciprocity capability N BC I.e. terminals without beam reciprocity. 2 nd subset-N BC The subset is provided with partial beam reciprocity capability N BC The beam reciprocity capability of the terminal increases in sequence according to the subset number.
Meanwhile, for a terminal with partial beam reciprocity capability and a terminal without beam reciprocity capability, a plurality of random access opportunities need to be allocated for the terminal to scan a transmission beam.
Another allocation method is that only a random access opportunity is allocated to the terminal with partial beam reciprocity capability and the terminal without beam reciprocity capability, and the scanning of the transmitting beam is completed through random access retry.
Another allocation method is that the random access channel time-frequency resources allocated to the terminals with different beam reciprocity capabilities are divided in a time division manner.
It should be noted that when resources are used to distinguish time-frequency resources allocated to terminals with different beam reciprocity capabilities, the terminals with different beam reciprocity capabilities may use the same preamble sequence resource pool.
Fig. 6 is a diagram of one possible preamble sequence resource pool configuration and notification scheme according to a second embodiment of the present invention; fig. 7 is another possible preamble sequence resource pool configuration and notification scheme according to a second embodiment of the invention. Fig. 8 is a schematic diagram of another possible preamble configuration using a cover code according to a second embodiment of the present invention; FIGS. 6 and 7 Different beam reciprocity capabilities of the terminals are differentiated based on random access preamble sequences are employed in 8. Wherein the random access preamble sequence is divided into N BC And disjoint subsets, each subset corresponding to a class of beam reciprocity capabilities. The base station transmits the N BC Each subset of preamble sequences is signaled to the terminal via a broadcast channel, or a main information block in the broadcast channel, or a system information block indicated by the main information block in the broadcast channel.
Referring to fig. 6, the range of possible preamble sequence indexes in each preamble sequence subset is informed by indicating the initial preamble sequence index of the first subset and the number of preamble sequences in each subset. Number of subsets N (i.e. N BC ) Or may be notified along with the preamble sequence subset configuration.
In FIG. 6, the contents of the dashed box, the number of subsets N (i.e., N as described above BC ) The information may be notified together with the preamble sequence resource pool information or may be notified in the random access configuration information alone.
Referring to fig. 7, the range of possible preamble sequence indexes in each preamble sequence subset is informed by indicating the initial preamble sequence index and the total number of preamble sequences of each subset.
In addition to the two manners shown in fig. 6 and 7, the configuration notification manner based on the preamble sequence subset further includes: informing a start index of a first subset of preamble sequences, an index of a last sequence of each subset of preamble sequences; or notifying the starting index of each preamble sequence subset, and the sequence number; or inform the start index and the index of the last sequence of each preamble sequence subset.
Referring to fig. 8, fig. 8 is a schematic diagram of a possible preamble sequence configuration using a cover code according to a second embodiment of the present invention, in which all preamble sequence subsets use the same basic sequence pool and different preamble sequence subsets use different cover code words. I.e. for N BC A subset of defined or preset N BC A cover code, and a base sequence resource pool. An nth subset of preamble sequences is formed from the base sequence resource pool and an nth cover code. At this time, when configuring the preamble sequence resource, it is necessary to notify the base sequenceThe first sequence index in the resource pool, the number of sequences in the base sequence pool, and the range of available cover code indexes.
If the cover code format is predefined, the cover code index range need not be notified, and only the subset number N (i.e., the aforementioned N BC )。
Fig. 9 is a block diagram of the preamble sequence of fig. 8 according to a second embodiment of the present invention.
Referring to fig. 9, fig. 9 shows a block diagram of one of the preamble subsets of fig. 8, with a single preamble subset being generated from a base sequence resource pool and a corresponding one of the cover codes according to fig. 8. In the structure of fig. 9, a subset of the preamble sequences consists of the same or different sequences in the base sequence resource pool, each sequence is preceded by a Cyclic Prefix (CP), and all sequences are followed by a Guard Time (GT). A preamble sequence subset consisting of N sequences, using a cover code w= [ w ] with a length of N 1 ，...，w N ]Processing is performed in which each element in the nth sequence is aligned with the nth element w in the overlay code n Multiplying. (1. Ltoreq. N. Ltoreq. N).
It should be noted that, for the terminals with different beam reciprocity capabilities to be distinguished and allocated by using the preamble sequence, the time-frequency resources of the random access channels can be uniformly configured, that is, the terminals with different beam reciprocity capabilities use the same time-frequency resources of the random access channels. One possible way is to configure random access channel time-frequency resources for all terminals to use, and terminals with different beam reciprocity capabilities employ different subsets of preamble sequences.
Another possible way is to configure a plurality of random access opportunities in a random access channel in order to facilitate the terminal to scan a transmission beam, and the terminal with different beam reciprocity capability selects a continuous number of random access opportunities with different numbers to transmit a preamble sequence.
Fig. 10 is a schematic diagram of an interaction flow between a base station and a terminal according to a second embodiment of the present invention. The wireless communication system of fig. 10 includes a terminal 1010 and a base station 1020 that communicate interactively.
In order to realize the implicit notification of beam reciprocity capability by the random access resource, the specific flow at the terminal side is as follows:
Step 1011: the terminal 1010 obtains random access configuration information, where the random access configuration information includes random access resource subset configuration conditions corresponding to different beam reciprocity capabilities, and the random access configuration information includes random access channel time-frequency resources allocated to terminals with different beam reciprocity capabilities or preamble sequence resource pool information allocated to terminals with different beam reciprocity capabilities.
Step 1013: the terminal 1010 selects corresponding random access resources according to its own beam reciprocity capability, including random access channel time-frequency resources suitable for the terminal of the beam reciprocity capability, or preamble sequence resources suitable for the terminal of the beam reciprocity capability. And the terminal selects an available sequence with equal probability according to the preamble sequence resource information, generates a preamble sequence and transmits the preamble sequence on a corresponding random access channel.
Step 1015: the terminal 1010 completes the subsequent random access procedure.
Corresponding to the terminal-side behavior, in the case where the random access resource implicitly informs of beam reciprocity capability, the base station-side behavior is as follows:
step 1021: the base station 1020 allocates random access resources, including different random access channel time-frequency resources or different preamble sequence resources, for terminals with different beam reciprocity. Specifically, the base station 1020 transmits random access resource configuration information including a random access resource subset configuration scenario allocated to terminals with different beam reciprocity capabilities, wherein the random access resources for the terminals with different beam reciprocity capabilities include one of random access channel time-frequency resources and preamble sequence resource pool information.
Step 1023: the base station 1020 detects the transmission of the preamble sequence and determines a subset of random access resources corresponding to the beam reciprocity capability, the subset of random access resources comprising random access channel time-frequency resources or preamble sequence resources.
Step 1025: the base station 1020 completes the subsequent random access procedure.
Fig. 11 is a flowchart illustrating a process of real-time adjustment of random access resources allocated to terminals with different beam reciprocity capability by a base station according to a second embodiment of the present invention.
According to the scheme of the second embodiment of the present invention, in step 1101, the statistics adjustment module in the base station may count the number proportion of terminals with beam reciprocity, terminals without beam reciprocity, and terminals with partial beam reciprocity in the current cell, so as to adjust the proportion of the random access resource subsets allocated to the terminals with different beam reciprocity in real time in step 1103.
Specifically, if the above-mentioned terminals having different beam reciprocity are distinguished by the random access channel time-frequency resources, the density of the random access channel time-frequency resources allocated to the terminals having different beam reciprocity can be adjusted to adjust the ratio of the random access resources allocated to the terminals having different beam reciprocity. For example, the time domain density of the respective random access channel time-frequency resource subsets is adjusted, for example, the number of occurrences of the random access channel time-frequency resource subsets allocated to terminals having different beam reciprocity capabilities within one subframe, etc. Such parameters may be signaled by random access channel configuration parameters, i.e. different subsets of random access channel time-frequency resources have different random channel configuration parameters.
If the above-mentioned terminals with different beam reciprocity capabilities are distinguished by the preamble sequences, the number of the preamble sequences included in the different preamble sequence resource subsets may be adjusted. Such parameters may be adjusted by varying the number of preambles in the subset of preambles.
In step 1105, a notification module in the base station notifies terminals with different beam reciprocity capabilities of the subset of random access resources.
For the above flow, the base station may count the terminal proportion with different beam reciprocity capabilities in the accessed terminal in a periodic manner, and determine whether to need to adjust the random access resource. Adjustment of the random access resource will cause system information carrying random access configuration information to change, and thus trigger a system information change procedure. And if the terminal is in a connected state, acquiring new system information according to the system information change instruction. If the terminal is in a non-connected state (e.g., idle state), the random access configuration information is acquired before each random access attempt.
Fig. 12 is a schematic diagram of an apparatus for determining random access resources by a terminal according to a second embodiment of the present invention.
The device for determining random access resources by the terminal according to the second embodiment of the invention comprises the following modules: a configuration information obtaining module 1201, where the terminal obtains random access configuration information from a main information block or a system information block indicated by the main information block in a broadcast channel, where the configuration information includes random access resources (time-frequency resources or preamble sequence resources) allocated for terminals with different beam reciprocity capabilities, specifically, the random access configuration information includes random access resource subset configuration situations corresponding to the different beam reciprocity capabilities, including random access channel time-frequency resources allocated to the terminals with different beam reciprocity capabilities or preamble sequence resource pool information allocated to the terminals with different beam reciprocity capabilities; a random access resource selection module 1203, the terminal selects a random access resource (time-frequency resource or preamble sequence resource) according to the beam reciprocity capability; the preamble sequence transmitting module 1205 generates a preamble sequence according to the selected random access resource, and transmits the preamble sequence on the corresponding time-frequency resource.
Fig. 13 is a schematic diagram of an apparatus for allocating random access resources by a base station according to a second embodiment of the present invention. As shown in fig. 13, an apparatus for allocating random access resources by a base station according to a second embodiment of the present invention includes the following modules: a random access resource configuration information sending module 1301, configured to send random access resource configuration information, where the random access resource configuration information includes a random access resource subset configuration situation allocated to terminals with different beam reciprocity capabilities, and the random access resource for the terminals with different beam reciprocity capabilities includes one of a random access channel time-frequency resource and preamble sequence resource pool information; the preamble sequence detecting module 1303 is configured to detect transmission of a preamble sequence, and determine a random access resource corresponding to beam reciprocity capability.
Fig. 14 is a schematic diagram of an apparatus for allocating random access resources by a base station according to a second embodiment of the present invention
The device for allocating random access resources by the base station according to the second embodiment of the invention comprises the following modules: a beam reciprocity capability statistics module 1401 for counting the proportion of each beam reciprocity capability of the accessed terminal; a random access resource allocation adjustment module 1403, configured to adjust random access resources (time-frequency resources or preamble sequence resources) allocated to terminals with different beam reciprocity capabilities according to the proportion of the terminals with each beam reciprocity capability obtained by the statistics module, and specifically, adjust random access resource allocation information, where the random access resource allocation information includes one of random access resource subset allocation conditions corresponding to the different beam reciprocity capabilities, and random access channel time-frequency resources allocated to the terminals with different beam reciprocity capabilities, and preamble sequence resource pool information allocated to the terminals with different beam reciprocity capabilities; the resource allocation information notifying module 1405 notifies the base station of the adjusted random access resource allocation information to the terminal through the main information block in the broadcast channel or the system information block indicated by the main information block.
The invention provides a mode for informing the beam reciprocity capability of the terminal, and the terminal can report the beam reciprocity capability of the terminal when the access is completed by sending the message 3 in the random access process or selecting the random access resource, so that the base station can know the beam reciprocity capability information of the terminal as soon as possible. After the information is obtained, the base station can more effectively perform subsequent processes such as scheduling, resource allocation, beam management, beam correction and the like. By adopting the method provided by the invention, the working efficiency of the system can be improved, and the flows of resource allocation, beam management, beam correction and the like can be more effective.
In order to facilitate understanding of exemplary embodiments, certain exemplary embodiments of random access methods and apparatuses and methods and apparatuses for allocating random access resources according to the present invention have been described and illustrated in the accompanying drawings. However, it should be understood that these exemplary embodiments are merely intended to illustrate exemplary embodiments, and are not limiting of exemplary embodiments. It should also be understood that the exemplary embodiments are not limited to the exemplary embodiments shown and described. Various modifications to the exemplary embodiments may be made by those of ordinary skill in the art.

Claims (13)

1. A method for operating a terminal in a wireless communication system, the method comprising:
if a random access response is detected in the random access, transmitting a message including an indication of beam reciprocity capability of the terminal; and
the contention resolution information is detected to complete the random access.
2. The method of claim 1, further comprising:
acquiring random access configuration information comprising random access channel configuration and preamble sequence resource pool information;
determining a random access channel and a preamble sequence according to the random access channel configuration and the preamble sequence resource pool information, and transmitting the preamble sequence on the random access channel; and
if a random access response is detected within the random access response window and a preamble identifier corresponding to the transmitted preamble is detected in the random access response, the random access response is successfully detected.
3. The method of claim 1, wherein the beam reciprocity capability is indicated by at least a 2-bit indicator.
4. The method of claim 1, wherein the transmitted message includes at least a beam reciprocity capability indication field and a radio resource control, RRC, connection request field; or alternatively
Wherein the RRC connection request field in the transmitted message includes a beam reciprocity capability indication field.
5. A method according to claim 3, wherein the message to be transmitted is encoded by channel coding before the message is transmitted, a cyclic redundancy check, CRC, is added, and a mask corresponding to beam reciprocity capability is added after the CRC is added.
6. The method of claim 1, wherein the beam reciprocity capability comprises at least one of:
the system has no beam reciprocity capability, complete beam reciprocity capability, partial beam reciprocity capability, strong partial beam reciprocity capability and weak partial beam reciprocity capability.
7. A method for operating a base station in a wireless communication system, the method comprising:
detecting a message comprising an indication of beam reciprocity capability of the terminal after sending the random access response; and
and transmitting contention resolution information based on the contention result.
8. The method of claim 7, further comprising:
before sending the random access response, sending random access configuration information comprising random access channel configuration and preamble sequence resource pool information;
detecting a random access preamble sequence on the configured random access channel; and
A random access response is determined and transmitted according to the detected random access preamble sequence information.
9. The method of claim 7, wherein the beam reciprocity capability is indicated by at least a 1-bit indicator.
10. The method of claim 7, wherein the transmitted message includes at least a beam reciprocity capability indication field and a radio resource control, RRC, connection request field; or alternatively
Wherein the RRC connection request field in the transmitted message includes a beam reciprocity capability indication field.
11. The method of claim 7, wherein the beam reciprocity capability comprises at least one of:
the system has no beam reciprocity capability, complete beam reciprocity capability, partial beam reciprocity capability, strong partial beam reciprocity capability and weak partial beam reciprocity capability.
12. A terminal configured to implement the method of any one of claims 1 to 6.
13. A base station configured to implement the method of any one of claims 7 to 11.
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