CN114269026B - Random access signal processing method, random access method, device and storage medium - Google Patents

Abstract

The invention discloses a random access signal processing method, a random access device and a storage medium, wherein the method comprises the following steps: when physical random access signals initiated by a plurality of user equipment are processed, different response messages can be generated for each physical random access signal, and further, the user equipment can obtain different response messages. The problem of collision of time-frequency resources of the random access message 3 in the traditional method can be avoided, and the problem of failure of signal transmission of the random access message 3 corresponding to a plurality of user equipment is caused. In addition, the random access signal processing method provided by the invention can ensure that each user equipment can only successfully descramble the random access response data which is served to the radio frequency signal processing unit of the user equipment, thereby further avoiding the problem of time-frequency resource conflict of the random access message 3 and being beneficial to improving the random access success rate of the user equipment.

Description

Random access signal processing method, random access method, device and storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, a device, and a storage medium for processing a random access signal.

Background

For indoor coverage of wireless communications, distributed base stations are currently one of the most dominant deployments. The distributed base station has lower cost and high construction flexibility. The core of the initial distributed base station structure is to separate a conventional macro base station Baseband processing Unit (BBU) from a Radio frequency processing Unit (RU), and connect the two units through an optical fiber. In network deployment, the BBU, the core network and the wireless network indicating equipment are centralized in a machine room, and then are connected with the RUs deployed on the planning station through optical fibers to complete network coverage. Thereby reducing the construction cost and improving the efficiency. With the demands for increasing the communication range and reducing the construction cost, modules for forwarding and converging uplink and downlink data between the user and the base station are separated to form an Extended Unit (EU, also called rHub).

There are many options for the functionality split of a distributed base station based on the third generation partnership project (3 GPP) protocols. The most widely accepted distributed base station consists of three parts: the first part is a host unit (BBU or DU) which completes the modulation and demodulation of baseband signals, the second part is an expansion unit (EU or rHub) which forwards and merges uplink and downlink data, and the third part is a Remote Unit (RU) which receives and transmits uplink and downlink radio frequency signals.

Fig. 1 shows a schematic diagram of a protocol stack 100 of a physical layer (PHY layer), a medium access indication layer (MAC layer) and a radio resource indication layer (RRC layer) in an access network of a distributed base station.

First, Radio Resource management, indication, and scheduling are performed by a Radio Resource Control (RRC) protocol. Specifically, the following functions are mainly included: broadcasting of system information; paging information (paging); establishing and releasing RRC (radio Resource control) connection; transmitting NAS (Non-Access Stratum) information including session management, user management, security management, and charging management; transmitting AS (Access stratum) information including radio bearer management, radio channel processing and encryption; transmission of user radio access capability; configuring wireless resources; measurement configuration and reporting; and a movement indication.

Then, an ip (internet Protocol) header of an upper layer is compressed and decompressed through a Packet Data Convergence Protocol (PDCP), and user Data is transmitted and maintained. Meanwhile, encryption and decryption of user data and an indication plane protocol are supported, so that the integrity of the data is guaranteed.

Subsequently, the segmentation and retransmission services are provided to the user through a Radio Link Control (RLC).

Next, the Media Access Control (MAC) defines the way data frames are propagated, physical addressing and logical topology on the medium. For data transmission, the MAC protocol first determines whether data can be transmitted, and if so, the data and indication information are transmitted to the physical layer in a prescribed format. For data reception, the MAC layer removes header information from the received data from the PHY and transmits the data to an upper layer.

Then, a data path is provided for the data side device through a Physical layer Protocol (PHY) to transmit data.

Finally, data is transmitted and received via a radio frequency link (RF chain).

Three units in the distributed base station: the functional partitioning of BBU (or DU), rHub (or EU), and RU, as a general understanding, is generally believed that BBU (or DU) will implement the processing functions of RRC, PDCP, High RLC (High-RLC), Low RLC (Low-RLC), High MAC (High-MAC), Low MAC (Low-MAC), and High PHY (High-PHY) protocol modules, rHub will implement the processing functions of Low PHY (Low-PHY) protocol modules, and RU will implement the processing functions of RF modules. But this division of functional blocks is not exclusive. For example, rHub can also perform High-PHY and MAC layer protocol processing.

On the other hand, any User Equipment (UE) performing wireless communication under the distributed base station needs to establish an air interface connection with the base station successfully through an initial random access procedure, that is, after the UE establishes uplink synchronization through random access, the UE can communicate with the base station (data interaction). At present, based on the 3GPP protocol, the access method used by the initial random access is referred to as a first Type random access (Type-1 random access) and a second Type random access (Type-2 random access). The second type of random access is designed to reduce the time delay caused by information interaction in the first type of random access. In some other materials and documents, the first type of random access is also referred to as four-step random access (4-step access), and the second type of random access is referred to as two-step random access (2-step access). This corresponds to the number of steps of both random access procedures.

In addition, the base station may be divided into a Contention-Based Random Access (CBRA) and a non-Contention Random Access (CFRA) according to whether the base station configures a preamble (preamble) that needs to be used when initiating the Random Access request for the UE. For the former, the base station does not allocate a preamble to the UE in advance; for the latter, the base station assigns the UE with a preamble beforehand. The random access, whether of the first type or the second type, may be one of contention-based or non-contention-based random access. Therefore, when the UE performs the random access procedure, there are four possible random access procedures, that is: the method comprises a contention-based first-class random access process, a contention-free first-class random access process, a contention-based second-class random access process and a contention-free second-class random access process.

In a distributed base station, there may be a case where a plurality of UEs served by different RUs select the same preamble ID and initiate a random access procedure using the same time-frequency resource. According to the current four-step random access process, since a plurality of UEs perform a contention-based random access process, the base station sends at most one Msg4 (i.e. random access message 4) for resolving contention conflicts in the random access process of the plurality of UEs. Thus, at most only one UE may successfully access.

For the base station, since the time-frequency resources used by multiple UEs are the same as the preamble ID, the base station considers that only one UE initiates random access. However, due to the particularity of the distributed base station, the base station can determine that the Msg1 (i.e. random access message 1) or MsgA (i.e. random access message a) containing the same preamble ID sent by the same time-frequency resource is from different UEs through the distribution position of the RU. Even so, the base station does not distinguish the UE for processing in the current random access procedure.

For the UE, it is unknown whether other UEs on the same time-frequency resource use the same preamble ID and initiate a random access procedure, so that a final random access contention conflict may result, and then the base station may perform contention resolution by issuing Msg4 after receiving Msg3 (i.e., random access message 3). After all the UEs receive the Msg4, the C-RNTI carried in the Msg4 is matched with the C-RNTI sent in the Msg3, if the matching is consistent, the random access is successful, otherwise, the random access fails, the UE needs to initiate a random access process again, the UE with the random access failure needs to try to restart the random access process for many times, and the problem of power consumption increase of uplink transmission is brought to the UE. When the contention conflict of random access occurs, only one UE can be successfully accessed, and other UEs need to initiate random access again, each access will probably consume several tens of seconds, while in 5G applications, the service demand is large, the number of accessed UEs is large, the delay requirement is high, and there are higher requirements for the network access rate and the access success rate of the UE.

Accordingly, there is a need for improvement over the problems of the prior art described above.

Disclosure of Invention

In view of the above drawbacks of the prior art, the present invention provides a random access signal processing method, a random access device, and a storage medium, so as to solve the problem in the prior art that the random access success rate of a random access procedure initiated by a plurality of user equipments selecting the same preamble is low.

To achieve the above object, according to an aspect of the present invention, there is provided a random access signal processing method for a distributed base station, the method including: receiving and demodulating a physical random access signal from at least one user equipment, and taking each group of successfully demodulated physical random access signals with the same lead code as a target signal group; generating a response message corresponding to each physical random access signal in each target signal group and sending the response message to corresponding user equipment; wherein each of the response messages comprises a first portion and a second portion, the first portion being transmitted via a first type of channel and the second portion being transmitted via a second type of channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the method further comprises: for each of the response messages, scrambling a second portion of the response message based on identification information of the radio frequency signal processing unit carried in the first portion of the response message.

According to still another aspect of the present invention, there is provided a random access signal processing method for a distributed base station, the method including: receiving and demodulating a physical random access signal from at least one user equipment, and taking each group of successfully demodulated physical random access signals with the same lead code as a target signal group; generating a response message corresponding to each physical random access signal in each target signal group and sending the response message to corresponding user equipment; wherein each of the response messages comprises a first portion and a second portion, the first portion being transmitted via a first type of channel and the second portion being transmitted via a second type of channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the method further comprises: for each of the response messages, scrambling a second portion of the response message based on identification information of the radio frequency signal processing unit carried in the first portion of the response message; the method further comprises the following steps: within a preset time window, aiming at each target signal group, judging whether the number of the sent response messages is equal to the number of the received response messages from the at least one user equipment or not, and if so, completing the random access of each user equipment based on each response message; and if not, retransmitting the response message of the non-received associated response message.

According to another aspect of the present invention, there is also provided a random access method for a user equipment in a wireless communication system, the method including: generating a physical random access signal and transmitting the physical random access signal to a distributed base station in the wireless communication system; receiving at least one response message generated according to the random access signal processing method; for the received response message: descrambling the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first part and the physical resource information of the second type channel used by the response message; and receiving a second part of the response message from the second type channel indicated by the physical resource information, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

According to another aspect of the present invention, there is also provided a random access method for a user equipment in a wireless communication system, the method including: generating a physical random access signal and transmitting the physical random access signal to a distributed base station in the wireless communication system; receiving at least one response message generated according to the random access signal processing method; for the received response message: descrambling the first sub-part of the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first sub-part and the physical resource information used by the second sub-part of the response message; acquiring the second sub-part of the first part of the response message from the obtained physical resource information of the second sub-part, and descrambling the second sub-part according to the identification information of the radio frequency signal processing unit to obtain the physical resource information of the second type channel used by the response message; and receiving a second part of the response message from the second type channel indicated by the physical resource information of the second type channel, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

According to another aspect of the present invention, there is also provided a random access signal processing apparatus for a distributed base station, the apparatus including: the receiving and demodulating module is used for receiving and demodulating the physical random access signals from at least one piece of user equipment, and taking each group of successfully demodulated physical random access signals with the same lead code as a target signal group; a response message generating and sending module, configured to generate, for each target signal group, a response message corresponding to each physical random access signal in the target signal group, and send the response message to a corresponding user equipment; wherein each of the response messages comprises a first part and a second part, the first part is sent through a first type channel, the second part is sent through a second type channel, and the first part carries identification information of the radio frequency signal processing unit corresponding to the user equipment pointed by the response message; and the response message generating and transmitting module is further configured to, for each of the response messages, scramble a second portion of the response message based on the identification information of the radio frequency signal processing unit carried in the first portion of the response message.

According to another aspect of the present invention, there is also provided a random access signal processing apparatus for a distributed base station, the apparatus including: the receiving and demodulating module is used for receiving and demodulating the physical random access signals from at least one piece of user equipment, and taking each group of successfully demodulated physical random access signals with the same lead code as a target signal group; a response message generating and sending module, configured to generate, for each target signal group, a response message corresponding to each physical random access signal in the target signal group, and send the response message to a corresponding user equipment; wherein each of the response messages comprises a first part and a second part, the first part is sent through a first type channel, the second part is sent through a second type channel, and the first part carries identification information of the radio frequency signal processing unit corresponding to the user equipment pointed by the response message; and the response message generating and transmitting module is further configured to, for each of the response messages, scramble a second portion of the response message based on the identification information of the radio frequency signal processing unit carried in the first portion of the response message; the device further comprises a judging module, configured to judge, for each target signal group, whether the number of the sent response messages is equal to the number of the received response messages from the at least one ue within a preset time window, and if so, complete random access of each ue based on each response message; and if not, retransmitting the response message of which the associated response message is not received.

According to still another aspect of the present invention, there is also provided a random access apparatus for a user equipment in a wireless communication system, the apparatus comprising: the generating and sending module is used for generating a physical random access signal and sending the physical random access signal to a distributed base station in the wireless communication system; a receiving and analyzing module for receiving and analyzing at least one response message generated by the random access signal processing device; the response module is used for generating a corresponding response message based on the response message and sending the response message to the distributed base station under the condition of receiving the response message; wherein, the receiving and analyzing module executes the following operations for the received response message: descrambling the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first part and the physical resource information of the second type channel used by the response message; and receiving a second part of the response message from the second type channel indicated by the physical resource information, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

According to still another aspect of the present invention, there is also provided a random access apparatus for a user equipment in a wireless communication system, the apparatus comprising: the generating and sending module is used for generating a physical random access signal and sending the physical random access signal to a distributed base station in the wireless communication system; a receiving and analyzing module for receiving and analyzing at least one response message generated by the random access signal processing device; the response module is used for generating a corresponding response message based on the response message and sending the response message to the distributed base station under the condition of receiving the response message; wherein, the receiving and analyzing module executes the following operations for the received response message: descrambling the first sub-part of the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first sub-part and the physical resource information used by the second sub-part of the response message; acquiring the second sub-part of the first part of the response message from the obtained physical resource information of the second sub-part, and descrambling the second sub-part according to the identification information of the radio frequency signal processing unit to obtain the physical resource information of the second type channel used by the response message; and receiving a second part of the response message from the second type channel indicated by the physical resource information of the second type channel, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

According to yet another aspect of the present invention, there is also provided a computer-readable storage medium having a computer program stored therein, the computer program, when executed by a processor, implementing any of the random access signal processing methods described above.

According to yet another aspect of the present invention, there is also provided a computer-readable storage medium having a computer program stored therein, the computer program, when executed by a processor, implementing any of the random access methods described above.

In the random access signal processing method, the random access device and the storage medium provided by the invention, the method comprises the following steps: when physical random access signals initiated by a plurality of user equipment are processed, different response messages can be generated for each physical random access signal, so that the user equipment can obtain different response messages, the problem of time-frequency resource collision of random access messages 3 in the traditional method can be avoided, and the problem of failure of signal transmission of the random access messages 3 corresponding to the user equipment is caused. In addition, the random access signal processing method provided by the invention can ensure that each user equipment can only successfully descramble the random access response data issued by the RU serving the user equipment, thereby further avoiding the problem of time-frequency resource conflict of the random access message 3 and being beneficial to improving the random access success rate of the user equipment.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

Fig. 1 shows a schematic diagram of a protocol stack of a distributed base station.

Fig. 2A to fig. 2C respectively show schematic diagrams of networking topologies of the distributed base station system of the present invention.

Fig. 3A is a flowchart illustrating a method for processing a random access signal according to an embodiment of the present invention.

Fig. 3B is a flowchart illustrating a random access signal processing method according to another embodiment of the present invention.

Fig. 4A is a flowchart illustrating a contention-based random access of a first type according to an embodiment of the present invention.

Fig. 4B is a flowchart illustrating contention-based random access of the second type according to an embodiment of the present invention.

Fig. 5 is a schematic diagram illustrating an operation flow of a base station side based on a first type random access procedure according to an embodiment of the present invention.

Fig. 6 is a schematic operation flow diagram of a user equipment side based on a first type random access procedure according to an embodiment of the present invention.

Fig. 7 is a schematic diagram illustrating an operation flow of a base station side based on a second type random access procedure according to another embodiment of the present invention.

Fig. 8 is a schematic operation flow diagram of a user equipment side based on a second type random access procedure according to yet another embodiment of the present invention.

Fig. 9 shows a block diagram of a random access signal processing apparatus according to an embodiment of the present invention.

Fig. 10 is a block diagram illustrating a random access signal processing apparatus according to still another embodiment of the present invention.

Fig. 11 shows a block diagram of a random access apparatus according to an embodiment of the present invention.

Fig. 12 is a block diagram illustrating a random access apparatus according to another embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware circuits or integrated circuits, or in different networks and/or processor means and/or micro-indicator means.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The present invention will be described in further detail with reference to the accompanying drawings and detailed description, in order to make the objects, features and advantages thereof more comprehensible.

Fig. 2A to fig. 2C respectively show networking topology diagrams of the distributed base station system of the present invention. In particular, the distributed base station system comprises at least one base station or host unit (BBU or DU) configured to be able to perform at least the processing of data in communication and to perform the modulation and demodulation of baseband signals, as an example only one host unit is shown in the figure; at least one extension unit (rHub) connected to the host unit and configured to perform at least forwarding and merging of uplink and downlink data; at least one Remote Unit (RU) coupled to the expansion unit and configured to perform at least reception and transmission of uplink and downlink radio frequency signals; and at least one communication terminal (not shown) configured to communicate directly with the remote unit.

As shown in fig. 2A to fig. 2C in sequence, the structure of the distributed base station system in the embodiment of the present invention may be of the following three types: star distributed systems, chain distributed systems, and hybrid distributed systems. Specifically, as shown in fig. 2A, in a star distributed system, one BBU within the same cell connects one or more rhubs, each of which is connected to one or more RUs, and the rhubs may be interconnected; as shown in fig. 2B, in the chain-type distributed system, one BBU in the same cell is connected to one master rHub, the remaining multiple slave rhubs are communicated with the BBU through the rHub at the previous stage, each rHub is connected to one or more RUs, and the multiple rhubs may or may not have any difference in function (e.g., master rHub and slave rHub); as shown in fig. 2C, in the hybrid distributed system (i.e., combination of the star distributed system and the chain distributed system), one DU in the same cell is respectively connected to two rhubs, one rHub is connected to a third rHub other than the two rhubs, the third rHub is communicated with the DU through a previous-stage rHub, and each rHub is connected to one or more RUs.

The UE referred to in the embodiments of the present invention, also referred to as a communication terminal, is a device that provides voice and/or data connectivity to users, and the communication terminal may be a mobile terminal, such as a mobile phone (or referred to as a "cellular" phone) and a computer having a mobile terminal, for example, a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device, which exchanges languages and/or data with a radio access network. For example, the terminal device may be a Personal Communication Service (PCS) phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), or the like. Common communication terminals include, for example: the mobile terminal includes a mobile phone, a tablet computer, a notebook computer, a handheld computer, a Mobile Internet Device (MID), and a wearable device, such as a smart watch, a smart bracelet, a pedometer, and the like, but the embodiment of the present application is not limited thereto. A communication terminal may communicate with one or more core networks through a Radio Access Network (RAN).

Fig. 3A is a flowchart illustrating a method for processing a random access signal according to an embodiment of the present invention. The random access signal processing method provided by the embodiment of the invention can be applied to the distributed base stations shown in fig. 2A to 2C.

Referring to fig. 3A, a method for processing a random access signal according to an embodiment of the present invention includes the following steps:

step S10, receiving and demodulating the physical random access signal from at least one user equipment, and taking each group of successfully demodulated physical random access signals with the same preamble as a target signal group;

step S20, aiming at each target signal group, generating a response message respectively corresponding to each physical random access signal in the target signal group and sending the response message to corresponding user equipment;

wherein each of the response messages comprises a first portion and a second portion, the first portion being transmitted via a first type of channel and the second portion being transmitted via a second type of channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the method further comprises: for each of the response messages, scrambling a second portion of the response message based on identification information of the radio frequency signal processing unit carried in the first portion of the response message.

The steps S10 to S20 will be specifically described below.

In step S10, the BBU/DU in the distributed base station receives and demodulates a physical random access signal from at least one User Equipment (UE) through a Physical Random Access Channel (PRACH), and each Cell (Cell) is typically allocated with 64 preamble sequences, and these 64 preamble sequences are generated by cyclic shifting one or more ZC root sequences. When the UE performs random access, it randomly selects a preamble sequence of the current cell to initiate random access (Msg 1), specifically, the user equipment sends a random access request carrying the preamble sequence through the PRACH during an initial random access process, and usually the BBU/DU completes detection of a received signal of the PRACH of at least one path to obtain a PRACH detection result corresponding to each path, and obtains the preamble sequence and its corresponding label by detecting the PRACH. Subsequently, the BBU/DU calculates, based on the PRACH location of each received physical Random Access signal, and according to a formula defined in the standard specification, a corresponding physical Random Access Radio Network Temporary Identity (RA-RNTI), and then returns a Random Access response message (Msg 2, i.e., Random Access message 2) to the UE.

When processing a physical random access signal (Msg 1) initiated by at least one UE, a BBU/DU receives and demodulates the physical random access signal from at least one UE, each group of physical random access signals with the same preamble code successfully demodulated is used as a target signal group, then the BBU/DU determines the preamble code sequence of the physical random access signal used by the UE and the receiving power thereof by carrying out sequence correlation, radio frequency data combination and peak detection on the root sequence corresponding to the preamble code of the physical random access signal of each target signal group, calculates the noise power, and then allocates communication resources to the UE, for example, via a Physical Downlink Control Channel (PDCCH).

In step S20, for each target signal group, the BBU/DU generates a response message corresponding to each physical random access signal in the target signal group and transmits the response message to a corresponding User Equipment (UE), respectively; each response message sent by the BBU/DU to the rHub or the RU comprises a first part and a second part, and for each response message, the first part of the response message is sent by a first type channel, and the second part of the response message is sent by a second type channel; illustratively, the first part of the response message is, for example, Downlink Control Information (DCI) transmitted in a Physical Downlink Control Channel (PDCCH), and the second part of the response message is, for example, random access response data (RAR data) transmitted in a Physical Downlink Shared Channel (PDSCH); and for each response message, scrambling the second part of the response message based on the identification information (RU _ ID) of the radio frequency signal processing unit carried in the first part of the response message so as to ensure that each UE can only successfully descramble random access response data (RAR data) issued by the radio frequency signal processing unit (RU) serving the UE.

The random access signal processing method provided by the embodiment of the invention can realize that:

when physical random access signals initiated by a plurality of user equipment are processed, different response messages can be generated for each physical random access signal, so that the user equipment can obtain different response messages, the problem of time-frequency resource collision of random access messages 3 in the traditional method can be avoided, and the problem of failure of signal transmission of the random access messages 3 corresponding to the user equipment is caused. In addition, the random access signal processing method provided by the embodiment of the invention can ensure that each user equipment can only successfully descramble the random access response data which is served by the radio frequency signal processing unit of the user equipment, thereby further avoiding the problem of time-frequency resource conflict of the random access message 3 and being beneficial to improving the random access success rate of the user equipment.

Further, for each target signal group, generating a response message respectively corresponding to each physical random access signal in the target signal group and sending the response message to the corresponding user equipment includes: for each response message, scrambling a first portion of the response message based on a random access radio network temporary identity carried by a physical random access signal corresponding to the response message.

Illustratively, fig. 4A shows a schematic flow chart of contention-based random access of the first type provided by the embodiment of the present invention.

As shown in fig. 4A, specifically, for a 4-step RA procedure (contention-based first-type random access procedure), step 1, before initiating random access, a UE needs to first acquire a set of preambles through SSB (Synchronization Signal Block) issued by BBU/DU. Compared to LTE, NR UEs also need to select beams first. After acquiring the set of preambles, the UE randomly selects one preamble when initiating random access, and sends the selected preamble in Msg 1. Meanwhile, the UE needs to carry a Random Access-Radio Network Temporary Identifier (RA-RNTI) in the Msg 1. The value of the RA-RNTI is determined by the time-frequency resources of the Msg1, and the time-frequency resources used for transmitting the Msg1 are randomly selected from a time-frequency Resource set indicated by Radio Resource Control (RRC) signaling of the BBU/DU. And step 2, respectively sending different Msg2 to different RUs by the BBU/DU. The Msg2 includes Downlink Control Information (DCI) transmitted on one Downlink control channel (PDCCH) and response data (RAR data) for random access transmitted on one Downlink shared data channel (PDSCH). Specifically, in the DCI delivered in the Msg2, the RU _ ID of the RU is added to the delivered target RU. The DCI includes a time-frequency resource position indicating the PDSCH in the Msg2, an MCS (Modulation and coding scheme) required for decoding the PDSCH, and an RU _ ID. And the DCI is scrambled by the RA-RNTI, ensuring that the UE can successfully descramble the DCI and obtain the RU _ ID of the RU serving the UE.

For the response data (RAR data) issued in the Msg2, at least one of the following items is included:

1) a Backoff Indicator (Backoff Indicator) is used to indicate a time that the UE needs to wait for the next random access, for example, the time that the UE needs to wait for initiating the next random access procedure after one random access failure.

2) RAPID (Random Access Preamble ID ), a Preamble ID corresponding to the UE initiating the Random Access procedure, may be used for the UE to check whether the RAPID is consistent with the Preamble ID reported in the Msg 1.

3) TA (Timing Advance), which is used to indicate the Timing Advance when the UE sends Msg 3.

4) A temporary cell radio temporary network identity (TC-RNTI) allocated to the corresponding user equipment for one identity temporarily allocated to the UE. The TC-RNTI values of different UEs are different.

It should be noted that, since different UEs initiate the random access procedure using the same preamble ID, the same random access preamble ID is required to be used to ensure that the UE can successfully receive the Msg 2. In addition, the RAR data is scrambled by the RU _ ID, so that the UE can only successfully descramble the RAR data transmitted by the RU serving the UE.

In the prior art, only a first portion of the response message transmitted via a first type of channel (e.g., PDCCH) is typically scrambled, while a second portion of the response message transmitted via a second type of channel (e.g., PDSCH) is not scrambled. For example, for a 4-step RA procedure, the DCI contained in the first part of the response message is scrambled by the RA-RNTI in step 1. The UE needs to detect Msg2 in a defined time Window (RAR Window), and first, the UE descrambles the DCI in the first part of the response message (Msg 2) using the RA-RNTI in Msg 1. If descrambling is successful, the time-frequency resource position and the Modulation and Coding Scheme (MCS) for demodulation in the response message (Msg 2) sent by the BBU/DU can be obtained. In this case, each UE can obtain the second part corresponding to the response message (Msg 2) after successfully descrambling the first part of the response message (Msg 2) based on the RA-RNTI carried by the respective transmitted physical random access signal, thereby obtaining the response data (RAR data) in the response message (Msg 2). However, since RA-RNTIs carried by physical random access signals (Msg 1) sent by a plurality of UEs initiating random access by using the same preamble ID are the same, the UEs initiating random access by using the same preamble ID can successfully descramble DCI in the first part of the response message (Msg 2) through the same RA-RNTI, and after successful descrambling, physical resource information of a second type channel used by the response message carried by the first part of the response message can be obtained, and then each UE receives response data (RAR data) from the second type channel indicated by the physical resource information. Therefore, there may be a situation that a part of the UEs descramble the first part of the response message which should belong to other UEs by mistake based on the same RNTI, so as to obtain the response data (RAR data) which should belong to other UEs, and then use the time-frequency resources in the uplink grant information which should belong to other UEs for sending the response message (Msg 3) and for the subsequent contention resolution process. Therefore, in this case, the other UEs cannot receive the response data (RAR data) corresponding to the physical random access signal, and the other UEs cannot feed back their respective response messages (Msg 3), which results in a random access failure, and therefore, the random access procedure described above reduces the random access success rate of the other UEs. In addition, since some UEs use the time-frequency resources in the response data (RAR data) that should belong to other UEs, there is a problem of time-frequency resource collision when Msg3 is sent subsequently.

In the embodiment of the invention, not only the first part of the response message transmitted by the first type channel (such as PDCCH) is scrambled and the identification information (RU _ ID) of the radio frequency signal processing unit corresponding to the user equipment pointed by the response message is carried in the first part of the response message, but also the second part of the response message transmitted by the second type channel (such as PDSCH) is scrambled, and the second part of the response message is scrambled based on the identification information (RU _ ID) of the radio frequency signal processing unit carried in the first part of the response message. Therefore, after the UE detects Msg2 in a defined time Window (RAR Window), the UE first descrambles the DCI (first part) in the first part of the response message (Msg 2) by using the RA-RNTI in the Msg1, and if descrambling is successful, the time-frequency resource location in the response message (Msg 2) sent by the BBU/DU, the identification information (RU _ ID) of the radio frequency signal processing unit corresponding to the UE to which the response message (Msg 2) points, and the Modulation and Coding Scheme (MCS) for demodulation can be obtained. At this time, although RA-RNTIs carried by physical random access signals (Msg 1) transmitted by a plurality of UEs initiating random access according to themselves using the same preamble ID are the same, since each UE obtains identification information (RU _ ID) of a unique rf signal processing unit based on DCI (first part) in Msg2 that is successfully decoded; and since the second part of the response message is scrambled based on the identification information (RU _ ID) of the radio frequency signal processing unit carried in the first part of the response message, each UE descrambles the second part transmitted via the second type channel (e.g., PDSCH) based on the identification information (RU _ ID) of the unique radio frequency signal processing unit obtained in the first part of the response message, and if descrambling is successful, response data (RAR data) available to the UE can be acquired, otherwise, response data (RAR data) available to the UE cannot be acquired, thereby preventing part of the UEs from acquiring random access response data that should belong to other UEs after misunderstanding the first part of the response message, and enables each UE to send a reply message (Msg 3) using the time-frequency resources in the uplink grant message that it individually enjoys and for the subsequent contention resolution process. Therefore, the random access signal processing method provided by the embodiment of the invention comprises the following steps: on one hand, each UE initiating random access by adopting the same lead code can obtain different response messages (Msg 2), and further, the problem that only one response message (Msg 2) can be fed back when a plurality of UEs initiate random access by using the same lead code (Msg 1) in the traditional method can be avoided, so that the time-frequency resource collision problem is caused when a plurality of UEs feed back respective response messages (Msg 3) on the same time-frequency resource of the Msg3, and the signal transmission failure of the response messages (Msg 3) corresponding to the plurality of UEs is caused; on the other hand, the random access failure problem of other UE caused by that part of UE acquires random access response data which should belong to other UE after misunderstanding the first part of the response message can be prevented, and the random access success rate of a plurality of UE which have the same lead code and initiate random access can be improved.

It should be understood that, in step 2 above, only if the UE successfully acquires the information of Msg2 in the RAR window and compares that RAPID in the response message is the same as the preamble ID used in Msg1, the UE will use the time-frequency resources indicated by the UL grant in Msg2 to transmit Msg 3. Otherwise, the UE will reinitiate the access procedure, i.e. go back to the step of sending Msg 1.

Optionally, in the embodiment of the present invention, for a 4-step RA procedure (contention-based first-class random access procedure), according to a protocol, the BBU/DU sends a response message only for the physical random access signal successfully demodulated, that is, sends Msg2 to the physical random access signal successfully demodulated, where the response messages are all response messages of the same type. And for the physical random access signal with unsuccessful demodulation, the BBU/DU does not carry out any processing, and the UE waits for re-initiating the random access flow in the specified time.

It should be noted that, in the multiple response messages sent by the BBU/DU to the UE in the embodiment of the present invention, the uplink grant information, the timing adjustment amount, and the temporary radio network identifier carried in the different response messages are also different from each other.

Exemplarily, in the present embodiment, the random access signal processing method according to the above-described first type random access procedure may be exemplarily illustrated by the following embodiments.

Example one

In a distributed base station system, the UE1 and the UE2 select the same preamble ID, and send Msg1 to initiate a random access procedure by using the same time-frequency resource. UE1 is served by RU1, and UE2 is served by RU 2. The BBU/DU will acquire two Msg1 sent by RU1 and RU2, respectively, and Msg1 contains the same preamble ID. Since the BBU/DU acquired two Msg1, two different Msg2 would be sent to RU1 and RU 2. For Msg2 sent to RU1, where PDCCH (first type channel) carrying DCI1 (first part) is scrambled by RA-RNTI in step 1, and the DCI1 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location in response message of BBU/DU transmission (Msg 2), MCS required for decoding PDSCH, and RU _ ID 1; for Msg2 sent to RU2, where PDCCH (first type channel) carrying DCI2 (first part) is scrambled by RA-RNTI in step 1, and the DCI2 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location indicating PDSCH in Msg2, MCS required for decoding PDSCH, and RU _ ID 2. Wherein the PDSCH (second type channel) carrying the RAR data1 (second part) is scrambled based on the RU _ ID1 carried in the first part of the response message. The PDSCH (second type channel) carrying the RAR data2 (second part) is scrambled based on the RU _ ID2 carried in the first part of the response message. In general, if the UE can successfully receive the DCI, the UE obtains an RU _ ID corresponding to the UE and descrambles the second part of the response message by using the RU _ ID parameter to obtain response data (RAR data), so as to obtain uplink grant information (UL grant) unique to the UE for sending the response message (Msg 3) and for a subsequent contention resolution process.

Fig. 3B is a flowchart illustrating a random access signal processing method according to another embodiment of the present invention. The random access signal processing method provided by another embodiment of the present invention can also be applied to the distributed base stations shown in fig. 2A to 2C.

Referring to fig. 3B, a method for processing a random access signal according to an embodiment of the present invention includes the following steps:

step S10, receiving and demodulating the physical random access signal from at least one user equipment, and using each group of physical random access signals with the same lead code which are successfully demodulated as a target signal group;

step S20, aiming at each target signal group, generating a response message respectively corresponding to each physical random access signal in the target signal group and sending the response message to corresponding user equipment;

wherein each of the response messages comprises a first portion and a second portion, the first portion being transmitted via a first type of channel and the second portion being transmitted via a second type of channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the method further comprises: for each of the response messages, scrambling a second portion of the response message based on identification information of the radio frequency signal processing unit carried in the first portion of the response message.

The method further comprises the following steps:

step S30, in a preset time window, for each target signal group, determining whether the number of the sent response messages is equal to the number of the received response messages from the at least one ue, and if so, completing the random access of each ue based on each response message; and if not, retransmitting the response message of the non-received associated response message.

The above steps S10 to S20 can refer to the above description, and are not repeated herein.

In step S30, in order to ensure that each UE successfully decodes DCI of its own serving RU to acquire a unique RU _ ID parameter. Therefore, within a preset time window, for each target signal group, it is determined whether the number of the response messages sent is equal to the number of the response messages received from the at least one ue.

Specifically, in the first case, when a UE is at the edge of an RU, at which point the UE may not be able to successfully decode DCI, the serving RU may not receive the feedback reply message (Msg 3) for the UE, and thus the serving RU cannot send Msg3 to the BBU/DU. In this case, the BBU/DU sends Msg2 with different TC-RNTIs to all RUs providing service to the UE, but not all RUs send Msg3 to the BBU/DU, i.e. the BBU/DU receives Msg3 in a smaller number than Msg2 it issues.

Or in the second case, when the UE is located at the border of multiple RUs, it is possible that the RU _ ID parameter obtained after successfully decoding the DCI is the same as that of another UE, and the UE and the another UE select the same RU _ ID to descramble the second part in the response message to obtain response data (RAR data). Therefore, different UEs will send Msg3 using the same UL grant and time-frequency resources. In this case, the BBU/DU sends Msg2 with different TC-RNTIs to all RUs providing service to the UE, but not all RUs send Msg3 with different TC-RNTIs to the BBU/DU, i.e. the BBU/DU receives Msg3 with different TC-RNTIs in a smaller number than Msg2 with different TC-RNTIs issued by the BBU/DU.

According to the current processing mode of the random access flow. For the first case, a UE that did not successfully decode Msg2 cannot successfully access; in the second case, UEs using the same UL grant cannot all access due to collision. Therefore, the BBU/DU needs to resend Msg2 to an RU that did not correctly send Msg3, so that UEs that failed the random access procedure reattempt random access. Specifically, at this time, the BBU/DU may retransmit a response message to each serving RU that the associated reply message was not received, based on the identification information of the serving RU. It should be understood that the above-mentioned incorrect sending of Msg3 refers to RU not sending Msg3, or RU sending Msg3 that did not use the UL grant in the received Msg 2.

It should be appreciated that when the UE fails to initiate random access, it will generally go back to the Msg1 sending step, and if the UE needs to try random access again, it still needs to send Msg1 again. Generally, the energy consumption required by the UE side to initiate uplink Msg1 is considered to be larger than the energy consumption required by the base station side to initiate downlink Msg2, so that when the base station side determines that the number of received msgs 3 is not equal to the number of sent msgs 2, the UE can receive the decoded Msg2 again by retransmitting Msg2 to the RU which does not receive the associated Msg3, so as to try random access again. Based on the method, the base station side can be more friendly, so that the energy consumption of the whole distributed base station system is reduced, and the energy-saving effect is achieved.

Further, the method further comprises: step S40, accumulating the retransmission times of each retransmitted response message in the preset time window; for each response message: judging whether the retransmission times corresponding to the response message is smaller than a preset threshold value or not; and if the retransmission times corresponding to the response message are equal to the preset threshold value, stopping retransmitting the response message.

Fig. 5 is a schematic diagram illustrating an operation flow of a base station side based on a first type random access procedure according to an embodiment of the present invention.

Referring to fig. 5, in particular, the BBU/DU receives Msg1 after initializing configuration parameters for random access. Msg2 is sent after successful Msg1 reception, and W0 detects Msg3 within the detection window of the receive Msg 3.

If the BBU/DU fails to receive the Msg3 in the detection window W0, the Msg2 is retransmitted, and if the retransmission times of the BBU/DU to the Msg2 of the RU reach a preset threshold value K, the BBU/DU judges that the UE cannot be successfully accessed, and the threshold value K is sent to the UE through RRC signaling of the base station, SIB information or MIB information. The period of the retransmission Msg2 of the BBU/DU is W0/K. In addition, when the BBU/DU retransmits the Msg2, link adaptation may be performed, such as adjusting power, coding rate, modulation scheme, or beam-related parameters, such as beam direction and beam width.

Fig. 6 is a schematic operation flow diagram of a user equipment side based on a first type random access procedure according to an embodiment of the present invention.

Referring to fig. 6, specifically, after the UE completes downlink synchronization and acquires configuration parameters for initializing random access configured by the BBU/DU, the UE sends Msg1 to start a random access process. If the UE successfully receives and decodes Msg2 within the detection window W1 of Msg2, the UL grant information obtained in Msg2 and the time-frequency resource information are used for Msg3 transmission. Otherwise, the UE may perform up to K detections within the detection window W1.

If K tests within the test window W1 still fail to successfully receive and decode the Msg2, the UE resends the Msg 1.

After the UE sends Msg3, it will detect Msg4 within the detection window W2. If the UE successfully receives and decodes the Msg4, the UE completes the random access procedure.

Otherwise the UE will re-detect Msg2 within detection window W2 until the total number of detections of Msg2 reaches K times. That is, if Msg2 was detected M times before the first Msg3 transmission, the upper limit of the number of times Msg2 can be detected again after Msg2 transmission is K-M times. The UE will resend Msg3 when it receives Msg 2.

It should be noted that the time windows W1 and W2 and the upper limit K of the detection times are sent to the UE through RRC signaling of the distributed base station, or SIB information, or MIB information.

Example two

In a distributed base station system, BBU/DU instructs K =3 by RRC signaling, i.e. UE1 and UE2 perform Msg2 detection at most 3 times. The UE1 and the UE2 select the same preamble ID and use the same time-frequency resource to send the Msg1 to initiate a random access procedure. UE1 is served by RU1 and is located in the center region of RU1, and UE2 is served by RU2 and is located in the edge region of RU 2. The BBU/DU will acquire two Msg1 sent by RU1 and RU2, respectively, and Msg1 contains the same preamble ID. Since the BBU/DU acquired two Msg1, two different Msg2 would be sent to RU1 and RU2, respectively. For Msg2 sent to RU1, where PDCCH (first type channel) carrying DCI1 (first part) is scrambled by RA-RNTI in step 1, and the DCI1 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location in response message of BBU/DU transmission (Msg 2), MCS required for decoding PDSCH, and RU _ ID 1; for Msg2 sent to RU2, where PDCCH (first type channel) carrying DCI2 (first part) is scrambled by RA-RNTI in step 1, and the DCI2 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location, MCS required for decoding PDSCH, and RU _ ID 2. Wherein the PDSCH (second type channel) carrying the RAR data1 (second part) is scrambled based on the RU _ ID1 carried in the first part of the response message. The PDSCH (second type channel) carrying the RAR data2 (second part) is scrambled based on the RU _ ID2 carried in the first part of the response message.

Since the UE1 is in the central area of the RU1, after the DCI1 is successfully received, the RU _ ID1 is obtained, and then the parameter of the RU _ ID1 is used to descramble the second part (RAR data 1) transmitted via the PDSCH (second type channel), if the descrambling is successful, the response data (RAR data 1) available to the UE1 can be obtained, otherwise, the response data (RAR data 1) available to the UE1 cannot be obtained, so that the UE1 can be prevented from obtaining the random access response data that should belong to other UEs after misinterpreting the first part of the response message, and the UE1 can use the time-frequency resource transmission response message (Msg 3) in the uplink grant information alone and use in the subsequent contention resolution process. And since the UE2 is in the edge region of RU2, the Msg2 could not be successfully decoded. The BBU/DU does not receive the Msg3 of the UE2 after the waiting time is over, and only sends the Msg2 once, which is less than the upper limit of the Msg2 sending times by 3 times. Therefore, link adaptation is performed, and Msg2 is retransmitted to RU2 which has not correctly transmitted Msg3, after at least one of power, coding rate, modulation scheme, beam direction and beam width is adjusted. After receiving the Msg2 for the second time, the UE2 obtains the RU _ ID2 if the DCI2 can be successfully decoded, then descrambles the second part (RAR data 2) transmitted via the PDSCH (second type channel) using the parameters of the RU _ ID2, and if the descrambling is successful, can obtain the response data (RAR data 2) available to the UE2, otherwise, cannot obtain the response data (RAR data 2) available to the UE 2. And will not be described in detail herein.

EXAMPLE III

In a distributed base station system, BBU/DU instructs K =3 by RRC signaling, i.e. UE1 and UE2 perform Msg2 detection at most 3 times. The UE1 and the UE2 select the same preamble ID and use the same time-frequency resource to send the Msg1 to initiate a random access procedure. UE1 is served by RU1 and is located in the center region of RU1, and UE2 is served by RU2 and is located in the edge region of RU 2. The BBU/DU will acquire two Msg1 sent by RU1 and RU2, respectively, and Msg1 contains the same preamble ID. Since the BBU/DU acquired two Msg1, two different Msg2 would be sent to RU1 and RU 2. For Msg2 sent to RU1, where PDCCH (first type channel) carrying DCI1 (first part) is scrambled by RA-RNTI in step 1, and the DCI1 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location in response message of BBU/DU transmission (Msg 2), MCS required for decoding PDSCH, and RU _ ID 1; for Msg2 sent to RU2, where PDCCH (first type channel) carrying DCI2 (first part) is scrambled by RA-RNTI in step 1, and the DCI2 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location, MCS required for decoding PDSCH, and RU _ ID 2. Wherein the PDSCH (second type channel) carrying the RAR data1 (second part) is scrambled based on the RU _ ID1 carried in the first part of the response message. The PDSCH (second type channel) carrying the RAR data2 (second part) is scrambled based on the RU _ ID2 carried in the first part of the response message.

Since the UE1 is in the central area of the RU1, after the DCI1 is successfully received, the RU _ ID1 is obtained, and then the parameter of the RU _ ID1 is used to descramble the second part (RAR data 1) transmitted via the PDSCH (second type channel), and if the descrambling is successful, the response data (RAR data 1) available for the UE1 can be obtained, otherwise, the response data (RAR data 1) available for the UE1 cannot be obtained. And since the UE2 is in the edge region of RU2, the Msg2 could not be successfully decoded. After the waiting time is over, the BBU/DU does not receive the Msg3 of the UE2, so link adaptation is carried out, and the Msg2 is retransmitted after at least one of power, coding rate, modulation mode, beam direction and beam width is adjusted. If the UE2 has not successfully decoded after three Msg2 detections, and the BBU/DU retransmits the Msg2 the upper limit (3 times), the BBU/DU will not resend the Msg 2. Therefore, the UE2 will reinitiate the random access procedure after detecting that the number of retransmissions of the Msg2 reaches the upper limit.

Example four

In one distributed base station system, BBU/DU instructs K =3 by RRC signaling, i.e., UE1 and UE2 to perform Msg2 detection at most 3 times. The UE1 and the UE2 select the same preamble ID, and send Msg1 to initiate a random access procedure using the same time-frequency resource. UE1 is served by RU1 and is located in the central region of RU1, and UE2 is served by RU2 and is located in the border region of RU1 and RU 2. The BBU/DU will acquire two Msg1 sent by RU1 and RU2, respectively, and Msg1 contains the same preamble ID. Since the BBU/DU acquired two Msg1, two different Msg2 would be sent to RU1 and RU 2. For Msg2 sent to RU1, where PDCCH (first type channel) carrying DCI1 (first part) is scrambled by RA-RNTI in step 1, and the DCI1 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location in response message of BBU/DU transmission (Msg 2), MCS required for decoding PDSCH, and RU _ ID 1; for Msg2 sent to RU2, where PDCCH (first type channel) carrying DCI2 (first part) is scrambled by RA-RNTI in step 1, and the DCI2 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location, MCS required for decoding PDSCH, and RU _ ID 2. Wherein the PDSCH (second type channel) carrying the RAR data1 (second part) is scrambled based on the RU _ ID1 carried in the first part of the response message. The PDSCH (second type channel) carrying the RAR data2 (second part) is scrambled based on the RU _ ID2 carried in the first part of the response message.

Since the UE1 is in the central area of the RU1, after the DCI1 is successfully received, the RU _ ID1 is obtained, and then the parameter of the RU _ ID1 is used to descramble the second part (RAR data 1) transmitted via the PDSCH (second type channel), and if the descrambling is successful, the response data (RAR data 1) available for the UE1 can be obtained, otherwise, the response data (RAR data 1) available for the UE1 cannot be obtained. And since the UE2 is in the boundary region of RU1 and RU2, two Msg2 can be successfully decoded. The UE randomly selects the parameters of RU _ ID2, and then descrambles the second part of the response message using the parameters of RU _ ID2 to obtain response data (RAR data 2). So that both UE1 and UE2 can obtain unique uplink grant information (UL grant) for sending the reply message (Msg 3) and for the subsequent contention resolution process.

EXAMPLE five

In a distributed base station system, BBU/DU instructs UE1 and UE2 to detect Msg2 for 3 times at most through RRC signaling, and a detection window W1 after the UE sends Msg1 and a detection window W2 after the UE sends Msg 3. For example, the UE needs to detect Msg2 within 30ms after Msg1 is sent, Msg4 and possibly retransmitted Msg2 within 100ms after Msg3 is sent. The UE1 and the UE2 select the same preamble ID, and use the same time-frequency resource to send Msg1 to initiate a random access procedure. UE1 is served by RU1 and is located in the central region of RU1, and UE2 is served by RU2 and is located in the border region of RU1 and RU 2. The BBU/DU will acquire two Msg sent by RU1 and RU2, respectively, and Msg1 contains the same preamble ID. Since the BBU/DU acquired two Msg1, two different Msg2 would be sent to RU1 and RU 2. For Msg2 sent to RU1, where PDCCH (first type channel) carrying DCI1 (first part) is scrambled by RA-RNTI in step 1, and the DCI1 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location in response message of BBU/DU transmission (Msg 2), MCS required for decoding PDSCH, and RU _ ID 1; for Msg2 sent to RU2, where PDCCH (first type channel) carrying DCI2 (first part) is scrambled by RA-RNTI in step 1, and the DCI2 (first part) contains physical resource information indicating PDSCH (second type channel), time-frequency resource location, MCS required for decoding PDSCH, and RU _ ID 2. Wherein the PDSCH (second type channel) carrying the RAR data1 (second part) is scrambled based on the RU _ ID1 carried in the first part of the response message. The PDSCH (second type channel) carrying the RAR data2 (second part) is scrambled based on the RU _ ID2 carried in the first part of the response message.

Since the UE1 is in the central area of the RU1, after the DCI1 can be successfully received within 30ms after the Msg1 is transmitted, the RU _ ID1 is obtained, and then the RU _ ID1 parameter is used to descramble the second part (RAR data 1) transmitted via the PDSCH (second type channel), and if descrambling is successful, response data (RAR data 1) available for the UE1 can be obtained, otherwise, response data (RAR data 1) available for the UE1 cannot be obtained. However, since the UE2 is located at the boundary between RU1 and RU2, it can successfully decode two Msg2 within 30ms after Msg1 is transmitted. The UE randomly selects RU _ ID1, and then descrambles the second part of the response message using the RU _ ID1 parameter to obtain response data (RAR data). Therefore, after the UE1 and the UE2 descramble the same RAR data successfully, the same UL grant is obtained and the Msg3 is sent. Since the BBU/DU would only get Msg3 sent using the UL grant sent to RU1, the BBU/DU thinks that UE2 failed to descramble Msg2, and will therefore resend Msg2 to RU2, which contains RU _ ID 2. And sends Msg4 containing the same CCCH SDU (Common Control Channel Service Data Unit) as in Msg3 of UE1 to RU 1.

For both UEs described above, it is necessary to detect Msg4 within 100ms after sending Msg 3. The UE1 can successfully decode Msg4 because the CCCH SDU in Msg4 matches itself. However, the UE2 cannot successfully decode Msg4, and therefore will detect Msg2 within 100ms of the detection time window. And at this stage the BBU/DU will make at most two Msg2 retransmissions, i.e. the UE2 will make at most two Msg2 detections. If Msg2 is successfully detected, Msg3 will be sent again and Msg4 is waited. Otherwise, the UE2 will restart the random access procedure.

Fig. 4B is a flowchart illustrating contention-based random access of the second type according to an embodiment of the present invention.

As shown in fig. 4B, specifically, for the RA procedure (contention-based random access procedure of the second type) of 2 steps, in step 1, before initiating the random access, the UE needs to first obtain a preamble set through the SSB issued by the BBU/DU. Compared to LTE, NR UEs also need to select beams first. After acquiring the set of preambles, the UE randomly selects one preamble when initiating random access. The UE will send one MsgA, including sending the selected preamble on one PRACH channel (MsgA-PRACH) and sending the data (payload) on one PUSCH channel (MsgA-PUSCH). And after N symbols after the MsgA-PRACH are sent, the UE sends the MsgA-PUSCH. This said N value is related to numerology of the communication system and indicated by the BBU/DU through RRC signaling. The information sent on the MsgA-PRACH is similar to the Msg1 in the first type of random access flow, and the information sent on the MsgA-PUSCH is similar to the Msg3 in the first type of random access flow. For example, there are two cases:

scenario 1: and if the UE already has one C-RNTI, the C-RNTI needs to be sent in the MsgA.

Scenario 2: if the UE does not have the C-RNTI, CCCH-SDU (Common Control Channel Service Data Unit) needs to be sent in MsgA.

Step 2, after sending the MsgA, the UE needs to detect the MsgB, and the detection result may be as follows:

case 1: the UE detects MsgB within a specified time window (MsgB-ResponseWindow).

1. If the UE already has one C-RNTI and successfully descrambles a Random Access Response (RAR) message by using the C-RNTI, the UE successfully completes a Random Access flow. And the UE feeds back the HARQ ACK by using the PUCCH to indicate that the access is successful.

2. If the UE does not have the C-RNTI and successfully descramble random access response data (RAR) by using the MsgB-RNTI, the content in the MsgB acquired by the UE at the moment also carries the following information:

(1) backoff indicator: the BBU/DU does not successfully decode the MsgA-PRACH, and the UE will reinitiate the random access procedure after the time indicated by the parameter.

(2) fallback message for fallback: if the BBU/DU successfully decodes the MsgA-PRACH but does not successfully decode the MsgA-PUSCH, a failBackRAR is sent in the MsgB. And the BBU/DU indicates the UE to carry out a first type of random access flow by rollback RAR. The fallback RAR comprises a RAPID, a time-frequency resource required by the UE for sending the Msg3, a Time Advance (TA) and a TC-RNTI. And only when the UE detects that the RAPID is the same as the preamble ID sent by the UE in the MsgA, the UE can send the Msg3 by using the time-frequency resource provided by the fallbackRAR and receive the subsequent Msg 4. The procedure is the same as for the first type of random access. If the contention conflict resolution fails, the UE will reinitiate the random access procedure, i.e. go back to the step of sending MsgA.

(3) success rar (random access success response message): when the BBU/DU successfully decodes the MsgA-PRACH and the MsgA-PUSCH, success RAR is sent in the MsgB. And if the UE detects the C-RNTI/CCCH SDU which is the same as the C-RNTI/CCCH SDU transmitted in the MsgA in the success RAR according to whether the UE already has the C-RNTI or not, the random access flow is successfully completed. And the UE feeds back the HARQ ACK indication to access successfully by using the PUCCH. Otherwise, the UE will reinitiate the random access procedure, i.e. go back to the step of sending MsgA.

Case 2: the UE does not detect MsgB within a specified time Window (MsgB-Response Window).

1. The UE retries to send the MsgA until the number of attempts to send the MsgA reaches a predetermined threshold.

2. When the number of times the UE attempts to send a send MsgA exceeds a predetermined threshold and does not receive MsgB, the UE will switch to using the first type of random access, i.e., start sending Msg 1.

It should be understood that in the 2-step RA procedure (contention-based random access procedure of the second type) protocol, there are three possible scenarios for the demodulation result of the BBU/DU for the physical random access signal from at least one UE: in the first case, all the rf signal processing units can demodulate a random access signal successfully, and the CCCH values corresponding to the rf signal processing units are different from each other. In the second situation, a part of the radio frequency signal processing units can successfully demodulate a random access signal, and a part of the radio frequency signal processing units cannot successfully demodulate a random access signal. In the third situation, all the radio frequency signal processing units cannot successfully demodulate one random access signal, that is, all the physical random access signals on the radio frequency signal processing units fail to be demodulated.

In the embodiment of the present invention, for a 2-step RA procedure (contention-based random access procedure of the second type), according to a protocol, after successfully demodulating MsgA-PRACH, a BBU/DU needs to send a response message not only to a physical random access signal associated with successfully demodulated MsgA-PUSCH, but also to a physical random access signal associated with unsuccessfully demodulated MsgA-PUSCH. Therefore, under this protocol, the response messages include a first type of response message and a second type of response message, where the response message corresponding to the physical random access signal associated with the MsgA-PUSCH of which demodulation is successful is the first type of response message, and the response message corresponding to the physical random access signal associated with the MsgA-PUSCH of which demodulation is unsuccessful is the second type of response message. Therefore, in an embodiment of the present invention, the response message of the first type may be suscepssirar, and the response message of the first type may carry CCCH information and C-RNTI information of the UE corresponding to the physical random access signal. The second type of response message may be a fallback rar, and may carry the TC-RNTI of the UE corresponding to the physical random access signal and time-frequency resource information available for scheduling in the second type of response message.

For the 2-step RA procedure, when different UEs served by different rf signal processing units transmit MsgA-PRACH and MsgA-PUSCH using the same preamble ID and the same time-frequency resource (PUSCH) resource, a BBU/DU may not successfully decode MsgA-PRACH and MsgA-PUSCH of all UEs because collision may occur.

Therefore, in an embodiment of the present invention, the method further includes: and generating a corresponding response message for each physical random access signal associated with the MsgA-PUSCH with unsuccessful demodulation, sending the response message to the corresponding user equipment, and using all the physical random access signals associated with the MsgA-PUSCH with unsuccessful demodulation as a target signal group, wherein the response messages corresponding to the physical random access signals associated with different MsgA-PUSCHs with unsuccessful demodulation are different from each other. That is, the response messages (Msg 2) received by the user equipments corresponding to the physical random access signals associated with the different unsuccessful-demodulation MsgA-PUSCHs in the target signal group are also different from each other.

Further, in an embodiment of the present invention, the response message includes uplink Grant information (UL Grant), so that each ue feeds back a response message based on the uplink Grant information in the received response message. That is, after each user equipment receives the response message carrying the uplink grant, each user equipment sends a feedback message (Msg 3) associated with the response message (Msg 2) to the host unit on a different physical uplink shared resource channel (PUSCH) for the respective grant.

Fig. 7 is a schematic diagram illustrating an operation flow of a base station side based on a second type random access procedure according to another embodiment of the present invention.

As shown in FIG. 7, when a BBU/DU can successfully decode MsgA-PRACH and MsgA-PUSCH, then the BBU/DU will send MsgB. Otherwise, if the BBU/DU fails to decode the MsgA-PRACH and the MsgA-PUSCH, the UE is waited to resend the MsgA. If the BBU/DU only successfully decodes MsgA-PRACH but not MsgA-PUSCH, MsgB (failBackRAR) is sent to instruct the UE to fall back to the first type random access procedure, where MsgB corresponds to Msg 2. In this case, the service RU of the MsgA-PUSCH that is not successfully decoded can be determined from the MsgA-PUSCH information. Therefore, the BBU/DU sends Msg2 (MsgB) to the serving RU and scrambles the PDCCH carrying the DCI with the serving MsgB-RNTI, while the PDCCH carries the time-frequency resource information of the PDSCH decoding Msg2 (MsgB), the MCS required for decoding the PDSCH and the RU _ ID of the serving RU. The PDSCH of Msg2 (MsgB) is scrambled using identification information (RU _ ID) of the radio frequency signal processing unit.

Fig. 8 is a schematic operation flow diagram of a user equipment side based on a second type random access procedure according to yet another embodiment of the present invention.

As shown in fig. 8, after completing downlink synchronization and acquiring system configuration parameters, the UE sends MsgA to start a random access process. If the UE does not accept MsgB within the MsgB detection window W3, the UE will resend MsgA. And if the UE successfully receives and decodes the MsgB to obtain success RAR, the access is successfully ended. If the UE successfully receives and decodes the MsgB to obtain the fallbackRAR, the message in the fallbackRAR is used to send the Msg 3.

After the UE sends Msg3, it will detect Msg4 within the detection window W2.

If the UE successfully receives and decodes the Msg4, the UE completes the random access procedure.

Otherwise, the UE will re-detect Msg2 within the detection window W2 until the total number of detections of Msg2 reaches K times.

The UE will resend Msg3 when it receives Msg 2.

The time windows W3 and W2 and the upper limit K of the detection times are sent to the UE through RRC signaling of the base station, or SIB information, or MIB information.

Exemplarily, in the present embodiment, the random access signal processing method according to the above-described second type random access procedure may be exemplarily described by the following embodiments.

EXAMPLE six

In a distributed base station system, the BBU/DU instructs K =3 through RRC signaling, that is, if the UE1 and the UE2 receive the failback rar, Msg2 detection is performed 3 times at most. The UE1 and the UE2 select the same preamble ID and send MsgA to initiate a random access procedure by using the same time-frequency resource. UE1 is served by RU1 and is located in the center region of RU1, and UE2 is served by RU2 and is located in the edge region of RU 2. The BBU/DU will acquire two MsgA sent by RU1 and RU2, respectively, and MsgA-PRACH contains the same preamble ID.

Since the UE1 is in the central region of RU1, the BBU/DU successfully decodes MsgA of UE 1. Then msgb (success rar) is sent to RU 1. Wherein the PDCCH (first type channel) in MsgB carrying the DCI1 (first part) is scrambled by MsgB-RNTI in this step, and the PDSCH (second type channel) in MsgB carrying the second part is scrambled based on the RU _ ID1 carried in the first part of the response message. Whereas, since the UE2 is in the edge region of RU2, the BBU/DU successfully decodes MsgA-PRACH but not MsgA-PUSCH of the UE 1. Then msgb (fallbackrar) is sent to RU 2. Wherein the PDCCH (first type channel) in MsgB carrying the DCI2 is scrambled by MsgB-RNTI in this step, and the PDSCH (second type channel) in MsgB carrying the second part is scrambled based on the RU _ ID2 carried in the first part of the response message.

After receiving the msgb (fallback rar), the UE2 reverts to the first type random access procedure to send Msg 3.

EXAMPLE seven

In a distributed base station system, the BBU/DU instructs K =3 through RRC signaling, that is, if the UE1 and the UE2 receive the failback rar, Msg2 detection is performed 3 times at most. The UE1 and the UE2 select the same preamble ID and send MsgA to initiate a random access procedure by using the same time-frequency resource. UE1 is served by RU1 and is located in the central region of RU1, and UE2 is served by RU2 and is located in the border region of RU1 and RU 2. The BBU/DU will acquire two MsgA sent by RU1 and RU2, respectively, and MsgA-PRACH contains the same preamble ID.

Since the UE1 is in the central region of RU1, the BBU/DU successfully decodes MsgA of UE 1. Then msgb (success rar) is sent to RU 1. Wherein the PDCCH (first type channel) in MsgB carrying the DCI1 (first part) is scrambled by MsgB-RNTI in this step, and the PDSCH (second type channel) in MsgB carrying the RAR data1 (second part) is scrambled based on the RU _ ID1 carried in the first part of the response message. Whereas, since the UE2 is in the border region of RU1 and RU2, the BBU/DU successfully decodes MsgA-PRACH but not MsgA-PUSCH of the UE 1. Then msgb (fallbackrar) is sent to RU 2. Wherein the PDCCH (first type channel) in MsgB carrying the DCI2 is scrambled by MsgB-RNTI in this step, and the PDSCH (second type channel) in MsgB carrying the RAR data2 (second portion) is scrambled based on the RU _ ID2 carried in the first portion of the response message.

UE2 may receive and successfully decode MsgB (success RAR), but the SDU CCCH in RAR data in MsgB is inconsistent with the SDU CCCH information carried in MsgA by itself, then UE2 may determine that MsgB (success RAR) is not the MsgB sent to UE2 itself. Then, the UE2 will use the decoded msgb (failbackrar) message to fall back to the first type random access procedure Msg 3. The UE2 detects Msg4 within the time window W2 after sending Msg3, and the access is successful.

In the eighth embodiment, the method comprises the following steps of,

in a distributed base station system, the BBU/DU instructs K =3 through RRC signaling, that is, if the UE1 and the UE2 receive the failback rar, Msg2 detection is performed 3 times at most. The UE1 and the UE2 select the same preamble ID and send MsgA to initiate a random access procedure by using the same time-frequency resource. UE1 is served by RU1 and is located in the center region of RU1, and UE2 is served by RU2 and is located in the edge region of RU 2. The BBU/DU will acquire two MsgA sent by RU1 and RU2, respectively, and MsgA-PRACH contains the same preamble ID.

Due to the time-frequency resource conflict of MsgA of UE1 and UE2, BBU/DU successfully decodes MsgA-PRACH of both UEs, but not of either UE. Then msgb (fallbackrar) is sent to RU1 and RU 2. Wherein PDCCH (first type channel) carrying DCI1 (first part) in MsgB sent to RU1 is scrambled by MsgB-RNTI in this step, and PDSCH (second type channel) carrying RAR data1 (second part) in MsgB is scrambled based on RU _ ID1 carried in the first part of the response message. The PDCCH (first type channel) carrying the DCI2 (first part) in MsgB sent to RU2 is scrambled by MsgB-RNTI in this step, and the PDSCH (second type channel) carrying the RAR data2 (second part) in MsgB is scrambled based on the RU _ ID2 carried in the first part of the response message.

Both UEs send Msg3 using the message in the fallback rar. The BBU/DU successfully decodes Msg3 of the UE1 and sends Msg4 to the RU1, and then the UE1 successfully accesses. However, the BBU/DU did not successfully decode the Msg3 of the UE2, so the Msg2 is resent to the RU 2. The Msg2 is retransmitted until the BBU/DU still fails to decode the Msg3 of the UE2 after 3 times, so it is finally determined that the UE2 fails to access, and the random access process needs to be restarted, i.e. the Msg1 is retransmitted.

In another embodiment of the invention, the first part comprises a first sub-part and a second sub-part, both the first sub-part and the second sub-part being transmitted via the first type channel; wherein, for each response message, the first sub-part of the response message carries identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed and carries physical resource information used by the second sub-part of the response message.

Further, for each response message: scrambling a first sub-part of the first part based on a random access radio network temporary identity carried by a physical random access signal corresponding to the response message; scrambling a second subsection of the first section based on identification information of radio frequency signal processing units carried by the first subsection of the response message; scrambling said second portion based on identification information of radio frequency signal processing units carried by a first sub-portion of said first portion of the response message.

Illustratively, the BBU/DUs issue different Msg2 to different RUs, respectively. The Msg2 includes 2 DCIs and 1 RAR data. Specifically, in the first DCI (first subpart) delivered in Msg2, for a delivered target RU, physical resource information indicating that the second DCI (second subpart) is carried is included, and the RU _ ID of the target RU, wherein the carried first DCI (first subpart) is scrambled by the RA-RNTI in step 1. A second DCI (second subpart) issued in the Msg2 includes physical resource information for indicating a PDSCH (second type channel) in the Msg2, a time-frequency resource position in a response message (Msg 2) sent by a BBU/DU, an MCS required for decoding the PDSCH, and an RU _ ID; and the second DCI (second subportion) carried is scrambled by the RU _ ID carried in the corresponding first DCI (first subportion).

For the response data (RAR data) issued in the Msg2, at least one of the following items is included:

1) a Backoff Indicator (Backoff Indicator) is used to indicate a time that the UE needs to wait for the next random access, for example, the time that the UE needs to wait for initiating the next random access procedure after one random access failure.

2) RAPID (Random Access Preamble ID ), a Preamble ID corresponding to the UE initiating the Random Access procedure, may be used for the UE to check whether the RAPID is consistent with the Preamble ID reported in the Msg 1.

3) TA (Timing advance) for indicating the Timing advance when the UE sends Msg 3.

4) UL grant: and indicating the time-frequency resources used when the UE sends the Msg 3.

5) A temporary cell radio temporary network identity (TC-RNTI) allocated to the corresponding user equipment for one identity temporarily allocated to the UE. The TC-RNTI values of different UEs are different.

It should be noted that, since different UEs initiate the random access procedure using the same preamble ID, the same RAP-ID needs to be used to ensure that the UE can successfully receive the Msg 2. In addition, the RAR data is scrambled by using the RU _ ID, so that the UE can only successfully descramble the RAR data transmitted by the RU serving the UE.

Exemplarily, in the present embodiment, the random access signal processing method according to the above-described first type random access procedure may be exemplarily illustrated by the following embodiments.

Example nine

In a distributed base station system, the UE1 and the UE2 select the same preamble ID, and send Msg1 to initiate a random access procedure by using the same time-frequency resource. UE1 is served by RU1, and UE2 is served by RU 2. The BBU/DU will get two Msg1 sent by RU1 and RU2, respectively, and Msg1 contains the same preamble ID. Since the BBU/DU acquired two Msg1, two different Msg2 would be sent to RU1 and RU 2. For Msg2 sent to RU1 and RU2, wherein the carried first DCI (first subpart) is scrambled by RA-RNTI in step 1, and the first DCI (first subpart) contains physical resource information indicating that the second DCI (second subpart) is carried and a corresponding RU _ ID; the second DCI (second subportion) carried is scrambled by the RU _ ID carried in the corresponding first DCI (first subportion), including physical resource information indicating PDSCH (second type channel), time-frequency resource location, MCS required for decoding PDSCH. Wherein a PDSCH (second type channel) carrying RAR data (second portion) is scrambled based on the RU _ ID carried in the first portion of the response message. In general, after the UE successfully receives the first DCI (the first sub-portion), the UE obtains the RU _ ID and descrambles the second DCI (the second sub-portion) using the RU _ ID parameter. If descrambling is successful, the time-frequency resources of the PDSCH (second type channel) used for decoding the Msg2 and the MCS information required for decoding the PDSCH can be obtained to obtain response data (RAR data) available for the UE, so as to obtain unique uplink grant information (UL grant) for transmitting the Msg3 and for the subsequent contention resolution process.

Example ten

In a distributed base station system, BBU/DU instructs K =3 by RRC signaling, i.e. UE1 and UE2 perform Msg2 detection at most 3 times. The UE1 and the UE2 select the same preamble ID and use the same time-frequency resource to send the Msg1 to initiate a random access procedure. UE1 is served by RU1 and is located in the center region of RU1, and UE2 is served by RU2 and is located in the edge region of RU 2. The BBU/DU will acquire two Msg1 sent by RU1 and RU2, respectively, and Msg1 contains the same preamble ID. Since the BBU/DU acquired two Msg1, two different Msg2 would be sent to RU1 and RU 2. For Msg2 sent to RU1 and RU2, the first DCI (first subpart) carried is scrambled by RA-RNTI in step 1, and the first DCI contains physical resource information indicating that the second DCI (second subpart) is carried and a corresponding RU _ ID; the second DCI (second subportion) carried is scrambled by the RU _ ID carried in the corresponding first DCI (first subportion), including physical resource information indicating PDSCH (second type channel), time-frequency resource location, MCS required for decoding PDSCH. Wherein a PDSCH (second type channel) carrying RAR data (second portion) is scrambled based on the RU _ ID carried in the first portion of the response message.

Since the UE1 is in the center region of RU1, upon successful reception of the first DCI, RU _ ID1 is obtained and the RU _ ID1 parameter is used to descramble the second DCI and the second portion (RAR data) transmitted via PDSCH (second type channel). And since the UE2 is in the edge region of RU2, the Msg2 could not be successfully decoded. The BBU/DU does not receive the Msg3 of the UE2 after the waiting time is over, and only sends the Msg2 once, which is less than the upper limit of the Msg3 sending times by 3 times. Therefore, link adaptation is performed, and at least one of power, coding rate, modulation scheme, beam direction, and beam width is adjusted to retransmit the Msg2 to RU 2. And Msg2 includes the first and second DCI and RAR data. After receiving the Msg2 for the second time, the UE2 successfully decodes the first DCI to obtain RU _ ID2, and then successfully descrambles the second DCI and RAR data.

EXAMPLE eleven

In a distributed base station system, the BBU/DU instructs the UE1 and UE2 to perform Msg2 detection at most 3 times through RRC signaling. The UE1 and the UE2 select the same preamble ID and use the same time-frequency resource to send the Msg1 to initiate a random access procedure. UE1 is served by RU1 and is located in the central region of RU1, and UE2 is served by RU2 and is located in the border region of RU1 and RU 2. The BBU/DU will acquire two Msg1 sent by RU1 and RU2, respectively, and Msg1 contains the same preamble ID. Since the BBU/DU acquired two Msg1, two different Msg2 would be sent to RU1 and RU 2. For Msg2 sent to RU1 and RU2, wherein the carried first DCI (first subpart) is scrambled by RA-RNTI in step 1, and the first DCI (first subpart) contains physical resource information indicating that the second DCI (second subpart) is carried and a corresponding RU _ ID; the second DCI (second subportion) carried is scrambled by the RU _ ID carried in the corresponding first DCI (first subportion), including physical resource information indicating PDSCH (second type channel), time-frequency resource location, MCS required for decoding PDSCH. Wherein a PDSCH (second type channel) carrying RAR data (second portion) is scrambled based on the RU _ ID carried in the first portion of the response message.

Since the UE1 is in the center region of RU1, upon successful reception of the first DCI, RU _ ID1 is obtained and the RU _ ID1 parameter is used to descramble the second DCI and the second portion (RAR data) transmitted via PDSCH (second type channel). However, since the UE2 is located in the border area between RU1 and RU2, the first DCI issued by two RUs is successfully decoded at the same time, and RU _ ID1 and RU _ ID2 are obtained. The UE2 randomly selects RU _ ID1 to descramble the second DCI together with the RAR data, and sends Msg3 using the UL grant in the RAR data. The BBU/DU then receives Msg3 uploaded by RU1 and RU2, and detects that Msg3 uploaded by both RUs uses the UL grant allocated to RU 1. The BBU/DU then determines that the UE2 served by the RU2 obtained RU _ ID1 for descrambling, and a collision occurred with the UE 1. Therefore, BBU/DU resends Msg2 to RU2, and this Msg2 contains the first and second DCIs and RAR data.

Example twelve

In a distributed base station system, BBU/DU instructs UE1 and UE2 to detect Msg2 for 3 times at most through RRC signaling, and a detection window W1 after the UE sends Msg1 and a detection window W2 after the UE sends Msg 3. For example, the UE needs to detect Msg2 within 30ms after Msg1 is sent, Msg4 and possibly retransmitted Msg2 within 100ms after Msg3 is sent. The UE1 and the UE2 select the same preamble ID, and use the same time-frequency resource to send Msg1 to initiate a random access procedure. UE1 is served by RU1 and is located in the central region of RU1, and UE2 is served by RU2 and is located in the border region of RU1 and RU 2. The BBU/DU will acquire two Msg sent by RU1 and RU2, respectively, and Msg1 contains the same preamble ID. Since the BBU/DU acquired two Msg1, two different Msg2 would be sent to RU1 and RU 2. For Msg2 sent to RU1 and RU2, the first DCI (first subpart) carried is scrambled by RA-RNTI in step 1, and the first DCI contains physical resource information indicating that the second DCI (second subpart) is carried and a corresponding RU _ ID; the second DCI (second subportion) carried is scrambled by the RU _ ID carried in the corresponding first DCI (first subportion), including physical resource information indicating PDSCH (second type channel), time-frequency resource location, MCS required for decoding PDSCH. Wherein the PDSCH (second type channel) carrying the RAR data (second portion) is scrambled via the RU _ ID carried in the first DCI (first subportion) transmitted in the corresponding PDCCH (first type channel).

Since the UE1 is located in the central region of RU1, the first DCI can be successfully received 30ms after Msg1 is sent, and RU _ ID1 is obtained, and the second DCI is descrambled by RU _ ID1, so that the parameters required for descrambling RAR data are obtained. And since the UE2 is in the border region of RU1 and RU2, the first DCI is also successfully decoded within 30ms after the Msg1 is sent. And what the UE2 successfully decoded and selected is RU _ ID1 and descrambles the second DCI with RU _ ID1, thus obtaining the parameters needed to descramble the RAR data. And after the UE1 and the UE2 descramble the same RAR data successfully, acquiring the same UL grant and sending the same Msg 3. Since the BBU/DU side would only get Msg3 sent using UL grant sent to RU1, BBU/DU believes that UE2 failed to successfully descramble Msg2, the first DCI containing Msg2, RU _ ID2 and the second DCI scrambled with RU _ ID2 and RAR data would be resent to RU 2. And transmits Msg4 containing the same CCCH SDU in Msg3 of UE1 to RU 1.

It is necessary for both UEs to detect Msg4 within 100ms after sending Msg 3. The UE1 can successfully decode Msg4 because the CCCH SDU in Msg4 matches itself. However, the UE2 cannot successfully decode Msg4, and therefore will detect Msg2 within 100ms of the detection time window. And at this stage the base station will make at most two Msg2 retransmissions, i.e. the UE2 will make at most two Msg2 detections. If Msg2 is successfully detected, Msg3 will be sent again and Msg4 is waited. Otherwise, the UE2 will restart the random access procedure.

Exemplarily, in the present embodiment, the random access signal processing method according to the above-described second type random access procedure may be exemplarily described by the following embodiments.

EXAMPLE thirteen

In a distributed base station system, the BBU/DU instructs K =3 through RRC signaling, that is, if the UE1 and the UE2 receive the failback rar, Msg2 detection is performed 3 times at most. The UE1 and the UE2 select the same preamble ID and send MsgA to initiate a random access procedure by using the same time-frequency resource. UE1 is served by RU1 and is located in the center region of RU1, and UE2 is served by RU2 and is located in the edge region of RU 2. The BBU/DU will acquire two MsgA sent by RU1 and RU2, respectively, and MsgA-PRACH contains the same preamble ID.

Since the UE1 is in the central region of RU1, the BBU/DU successfully decodes MsgA of UE 1. Then msgb (success rar) is sent to RU 1. Wherein the first DCI carried in MsgB (first subportion) is scrambled by MsgB-RNTI in this step, the second DC carried in MsgB (second subportion) is scrambled by RU _ ID1 carried in the corresponding first DCI (first subportion), and the PDSCH carried with the second subportion (RAR data 1) in MsgB is scrambled by RU _ ID1 carried in the first DCI (first subportion) transmitted via the corresponding PDCCH (first type channel). Whereas, since the UE2 is in the edge region of RU2, the BBU/DU successfully decodes MsgA-PRACH but not MsgA-PUSCH of the UE 1. Then msgb (fallbackrar) is sent to RU 2. Wherein the first DCI carried in MsgB is scrambled by MsgB-RNTI in this step, the second DCI carried in MsgB (second subportion) is scrambled by RU _ ID2 carried in the corresponding first DCI (first subportion), and the PDSCH (second type channel) carried with RAR data (second subportion) in MsgB is scrambled via RU _ ID2 carried in the first DCI (first subportion) transmitted in PDCCH (first type channel).

After receiving the msgb (fallback rar), the UE2 reverts to the first type random access procedure to send Msg 3.

Example fourteen

In a distributed base station system, the BBU/DU instructs K =3 through RRC signaling, that is, if the UE1 and the UE2 receive the failback rar, Msg2 detection is performed 3 times at most. The UE1 and the UE2 select the same preamble ID, and send MsgA to initiate a random access procedure using the same time-frequency resource. UE1 is served by RU1 and is located in the center region of RU1, and UE2 is served by RU2 and is located in the edge region of RU 2. The BBU/DU will acquire two MsgA sent by RU1 and RU2, respectively, and MsgA-PRACH contains the same preamble ID. Due to resource conflicts of MsgA of UE1 and UE2, BBU/DU successfully decodes MsgA-PRACH for both UEs, but not for either UE. Then msgb (fallbackrar) is sent to RU1 and RU 2.

The first DCI carried (first subportion) in MsgB sent to RU1 is scrambled by MsgB-RNTI in this step, and the second DCI carried (second subportion) is scrambled by RU _ ID1 carried in the corresponding first DCI (first subportion), and PDSCH (second type channel) carried with RAR data1 (second subportion) in MsgB is scrambled via RU _ ID1 carried in the first DCI (first subportion) sent in PDCCH (first type channel).

The first DCI carried (first subportion) in MsgB sent to RU2 is scrambled by MsgB-RNTI in this step, and the second DCI carried (second subportion) is scrambled by RU _ ID2 carried in the corresponding first DCI (first subportion), and PDSCH (second type channel) carried with RAR data2 (second subportion) in MsgB is scrambled via RU _ ID2 carried in the first DCI (first subportion) sent in PDCCH (first type channel).

Both UEs send Msg3 using the message in the fallback rar. The BBU/DU successfully decodes Msg3 of the UE1 and sends Msg4 to the RU1, and then the UE1 successfully accesses. However, the BBU/DU did not successfully decode the Msg3 of the UE2, so the Msg2 is resent to the RU 2. The Msg2 is retransmitted until the BBU/DU still fails to decode the Msg3 of the UE2 after 3 times, so it is finally determined that the UE2 fails to access, and the random access process needs to be restarted, i.e. the Msg1 is retransmitted.

It should be noted that, in the above embodiments of the present invention, the radio frequency signal processing unit is a remote unit in the distributed base station.

According to another aspect of the present invention, an embodiment of the present invention provides a random access method. The random access method is used for user equipment in a wireless communication system, and the method comprises the following steps: generating a physical random access signal and transmitting the physical random access signal to a distributed base station in the wireless communication system; receiving at least one response message generated by the random access signal processing method according to any of the embodiments; for the received response message: descrambling the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first part and the physical resource information of the second type channel used by the response message; and receiving a second part of the response message from the second type channel indicated by the physical resource information, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

Specifically, for the received response message, each ue descrambles the first part of the response message according to the random access radio network temporary identifier carried in the physical random access signal sent by the ue, so as to obtain the identification information of the radio frequency signal processing unit carried in the first part and the physical resource information of the second type of channel used by the response message. After obtaining the identification information of the rf signal processing unit carried by the first part and the indication information of the second type channel used by the response message, each ue receives the second part of the response message from the second type channel indicated by the physical resource information, and descrambles the second part according to the identification information of the rf signal processing unit to obtain response data.

It should be understood that, for specific steps, other aspects, and effects of the random access method provided in the embodiment of the present invention, reference may be made to the contents of the foregoing embodiments, and details are not described herein again.

According to another aspect of the present invention, an embodiment of the present invention provides a random access method. The random access method is used for user equipment in a wireless communication system, and the method comprises the following steps: generating a physical random access signal and transmitting the physical random access signal to a distributed base station in the wireless communication system; receiving at least one response message generated by the random access signal processing method according to any of the embodiments; for the received response message: descrambling the first sub-part of the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first sub-part and the physical resource information used by the second sub-part of the response message; acquiring the second sub-part of the first part of the response message from the obtained physical resource information of the second sub-part, and descrambling the second sub-part according to the identification information of the radio frequency signal processing unit to obtain the physical resource information of the second type channel used by the response message; and receiving a second part of the response message from the second type channel indicated by the physical resource information of the second type channel, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

Specifically, for the received response message, each of the user equipments performs the following operations:

descrambling the first sub-part of the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal sent by the first sub-part of the response message so as to obtain the identification information of the radio frequency signal processing unit carried by the first sub-part and the physical resource information used by the second sub-part of the response message; after obtaining the identification information of the rf signal processing unit carried by the first sub-part of the first part and the indication information of the second type channel used by the response message, each ue receives the second part of the response message from the second type channel indicated by the physical resource information of the second type channel, and descrambles the second part according to the identification information of the rf signal processing unit to obtain response data.

It should be understood that specific steps, other aspects, and effects of the random access method provided in the embodiment of the present invention may refer to the contents of the foregoing embodiments, and are not described herein again.

Fig. 9 shows a block diagram of a random access signal processing apparatus 400 according to an embodiment of the present invention.

As shown in fig. 9, the apparatus 400 includes:

a receiving and demodulating module 410, configured to receive and demodulate a physical random access signal from at least one ue, and use each group of successfully demodulated physical random access signals with the same preamble as a target signal group;

a response message generating and sending module 420, configured to generate, for each target signal group, a response message respectively corresponding to each physical random access signal in the target signal group, and send the response message to a corresponding user equipment; wherein each of the response messages includes a first portion and a second portion, the first portion being transmitted via a first type of channel and the second portion being transmitted via a second type of channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the response message generating and transmitting module is further configured to, for each of the response messages, scramble the second portion of the response message based on the identification information of the radio frequency signal processing unit carried in the first portion of the response message.

It should be understood that the execution principle, other aspects and effects of each module in the random access signal processing apparatus provided in the embodiment of the present invention may specifically refer to the contents in the foregoing embodiments, and are not described herein again.

Fig. 10 shows a block diagram of a random access signal processing apparatus 500 according to another embodiment of the present invention.

As shown in fig. 10, the apparatus 500 includes:

a receiving and demodulating module 510, configured to receive and demodulate a physical random access signal from at least one ue, and use each group of successfully demodulated physical random access signals with the same preamble as a target signal group;

a response message generating and sending module 520, configured to generate, for each target signal group, a response message respectively corresponding to each physical random access signal in the target signal group, and send the response message to a corresponding user equipment; wherein each of the response messages comprises a first portion and a second portion, the first portion being transmitted via a first type channel and the second portion being transmitted via a second type channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the response message generating and transmitting module is further configured to, for each of the response messages, scramble the second portion of the response message based on the identification information of the radio frequency signal processing unit carried in the first portion of the response message;

the apparatus further includes a determining module 530, configured to determine, for each target signal group, whether the number of the response messages sent is equal to the number of the response messages received from the at least one ue within a preset time window, and if so, complete random access of each ue based on each response message; and if not, retransmitting the response message of which the associated response message is not received.

It should be understood that the execution principle, other aspects and effects of each module in the random access signal processing apparatus provided in the embodiment of the present invention may specifically refer to the contents in the foregoing embodiments, and are not described herein again.

Fig. 11 shows a block diagram of a random access apparatus 600 according to an embodiment of the present invention.

As shown in fig. 11, the apparatus 600 includes:

a generating and transmitting module 610, configured to generate a physical random access signal and transmit the physical random access signal to a distributed base station in the wireless communication system;

a receiving and parsing module 620, configured to receive and parse at least one response message generated by the random access signal processing apparatus 400 or the random access signal processing apparatus 500 of any of the above embodiments;

a response module 630, configured to, in a case that a response message is received, generate a corresponding response message based on the response message and send the response message to the distributed base station;

wherein, the receiving and analyzing module executes the following operations for the received response message:

descrambling the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first part and the physical resource information of the second type channel used by the response message;

and receiving a second part of the response message from the second type channel indicated by the physical resource information, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

It should be understood that the execution principle, other aspects and effects of each module in the random access apparatus provided in the embodiment of the present invention may specifically refer to the contents in the foregoing embodiments, and are not described herein again.

Fig. 12 is a block diagram illustrating a random access apparatus 700 according to another embodiment of the present invention.

As shown in fig. 12, the apparatus 700 includes:

a generating and transmitting module 710, configured to generate a physical random access signal and transmit the physical random access signal to a distributed base station in the wireless communication system;

a receiving and parsing module 720, configured to receive and parse at least one response message generated by the random access signal processing apparatus 400 or the random access signal processing apparatus 500 according to any of the above embodiments;

a response module 730, configured to, in a case that a response message is received, generate a corresponding response message based on the response message and send the response message to the distributed base station;

wherein, the receiving and analyzing module executes the following operations for the received response message:

descrambling the first sub-part of the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first sub-part and the physical resource information used by the second sub-part of the response message;

acquiring the second sub-part of the first part of the response message from the obtained physical resource information of the second sub-part, and descrambling the second sub-part according to the identification information of the radio frequency signal processing unit to obtain the physical resource information of the second type channel used by the response message;

and receiving a second part of the response message from the second type channel indicated by the physical resource information of the second type channel, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

It should be understood that the execution principle, other aspects and effects of each module in the random access apparatus provided in the embodiment of the present invention may specifically refer to the contents in the foregoing embodiments, and are not described herein again.

In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, implements the random access signal processing method according to any of the preceding embodiments.

In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, is adapted to carry out the random access method according to any of the preceding embodiments.

For specific limitations and implementation of the above steps, reference may be made to an embodiment of a random access method, which is not described herein again.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

The random access signal processing method, the random access device and the storage medium provided by the embodiments of the present invention are described in detail above, and a specific example is applied in the present document to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (18)

1. A random access signal processing method for a distributed base station, the method comprising:

receiving and demodulating a physical random access signal from at least one user equipment, and taking each group of successfully demodulated physical random access signals with the same lead code as a target signal group;

generating a response message corresponding to each physical random access signal in each target signal group and sending the response message to corresponding user equipment;

wherein each of the response messages comprises a first portion and a second portion, the first portion being transmitted via a first type of channel and the second portion being transmitted via a second type of channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the method further comprises: for each of the response messages, scrambling a second portion of the response message based on identification information of the radio frequency signal processing unit carried in the first portion of the response message;

wherein the radio frequency signal processing unit is a remote unit in the distributed base station.

2. The method of claim 1, wherein the generating, for each target signal group, a response message respectively corresponding to each physical random access signal in the target signal group and sending the response message to a corresponding user equipment comprises:

for each response message, scrambling a first portion of the response message based on a random access radio network temporary identity carried by a physical random access signal corresponding to the response message.

3. The random access signal processing method of claim 1,

the first portion comprises a first sub-portion and a second sub-portion, both the first sub-portion and the second sub-portion being transmitted via the first type channel;

wherein, for each response message, the first sub-part of the response message carries identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and carries physical resource information used by the second sub-part of the response message.

4. The method of claim 3, wherein the generating a response message corresponding to each physical random access signal in the target signal group and sending the response message to the corresponding user equipment for each target signal group comprises:

for each response message:

scrambling a first sub-part of the first part based on a random access radio network temporary identity carried by a physical random access signal corresponding to the response message;

scrambling a second subsection of the first section based on identification information of radio frequency signal processing units carried by the first subsection of the response message;

scrambling said second portion based on identification information of radio frequency signal processing units carried by a first sub-portion of said first portion of the response message.

5. The random access signal processing method of claim 1, wherein the second portion of the response message comprises at least one of:

a corresponding user equipment initiates a lead code identification of a random access process;

timing adjustment amount;

and allocating the temporary wireless network identification for the corresponding user equipment.

6. The method of claim 5, wherein the uplink grant information, the timing adjustment amount, and the temporary radio network identifier carried in the response message carrying the identification information of different RF signal processing units are different from each other.

7. A random access signal processing method for a distributed base station, the method comprising:

receiving and demodulating a physical random access signal from at least one user equipment, and taking each group of successfully demodulated physical random access signals with the same lead code as a target signal group;

generating a response message corresponding to each physical random access signal in each target signal group and sending the response message to corresponding user equipment;

wherein each of the response messages comprises a first portion and a second portion, the first portion being transmitted via a first type of channel and the second portion being transmitted via a second type of channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the method further comprises: for each of the response messages, scrambling a second portion of the response message based on identification information of the radio frequency signal processing unit carried in the first portion of the response message; wherein the radio frequency signal processing unit is a remote unit in the distributed base station;

the method further comprises the following steps:

determining, for each target signal group, whether the number of transmitted response messages is equal to the number of received reply messages from the at least one user equipment within a preset time window,

if the answer messages are equal, the random access of each user equipment is completed based on each answer message;

and if not, retransmitting the response message of the non-received associated response message.

8. The random access signal processing method of claim 7, wherein the method further comprises:

accumulating the retransmission times of each retransmitted response message in the preset time window;

for each response message:

judging whether the retransmission times corresponding to the response message is smaller than a preset threshold value or not;

and if the retransmission times corresponding to the response message are equal to the preset threshold value, stopping retransmitting the response message.

9. A random access method for a user equipment in a wireless communication system, the method comprising:

generating a physical random access signal and transmitting the physical random access signal to a distributed base station in the wireless communication system;

receiving at least one response message generated by the random access signal processing method according to any one of claims 1-2;

for a received response message:

descrambling the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first part and the physical resource information of the second type channel used by the response message;

and receiving a second part of the response message from the second type channel indicated by the physical resource information, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

10. A random access method for a user equipment in a wireless communication system, the method comprising:

generating a physical random access signal and transmitting the physical random access signal to a distributed base station in the wireless communication system;

receiving at least one response message generated by the random access signal processing method according to any one of claims 3-4;

for the received response message:

descrambling the first sub-part of the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first sub-part and the physical resource information used by the second sub-part of the response message;

acquiring the second sub-part of the first part of the response message from the obtained physical resource information of the second sub-part, and descrambling the second sub-part according to the identification information of the radio frequency signal processing unit to obtain the physical resource information of the second type channel used by the response message;

and receiving a second part of the response message from the second type channel indicated by the physical resource information of the second type channel, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

11. A random access signal processing apparatus for a distributed base station, the apparatus comprising:

the receiving and demodulating module is used for receiving and demodulating the physical random access signals from at least one piece of user equipment, and taking each group of successfully demodulated physical random access signals with the same lead code as a target signal group;

a response message generating and sending module, configured to generate, for each target signal group, a response message corresponding to each physical random access signal in the target signal group, and send the response message to a corresponding user equipment;

wherein each of the response messages comprises a first portion and a second portion, the first portion being transmitted via a first type channel and the first portion being transmitted via a second type channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the response message generating and transmitting module is further configured to, for each of the response messages, scramble the second portion of the response message based on the identification information of the radio frequency signal processing unit carried in the first portion of the response message;

wherein the radio frequency signal processing unit is a remote unit in the distributed base station.

12. A random access signal processing apparatus for a distributed base station, the apparatus comprising:

the receiving and demodulating module is used for receiving and demodulating the physical random access signals from at least one piece of user equipment, and taking each group of successfully demodulated physical random access signals with the same lead code as a target signal group;

a response message generating and sending module, configured to generate, for each target signal group, a response message corresponding to each physical random access signal in the target signal group, and send the response message to a corresponding user equipment;

wherein each of the response messages comprises a first portion and a second portion, the first portion being transmitted via a first type channel and the second portion being transmitted via a second type channel, the first portion carrying identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and the response message generating and transmitting module is further configured to, for each of the response messages, scramble the second portion of the response message based on the identification information of the radio frequency signal processing unit carried in the first portion of the response message; wherein the radio frequency signal processing unit is a remote unit in the distributed base station;

the device further comprises a judging module, configured to judge, for each target signal group, whether the number of the sent response messages is equal to the number of the received response messages from the at least one ue within a preset time window, and if so, complete random access of each ue based on each response message; and if not, retransmitting the response message of which the associated response message is not received.

13. A random access apparatus for a user equipment in a wireless communication system, the apparatus comprising:

the generating and sending module is used for generating a physical random access signal and sending the physical random access signal to a distributed base station in the wireless communication system;

a receiving and parsing module for receiving and parsing at least one response message generated by the random access signal processing apparatus according to claim 11 or 12;

the response module is used for generating a corresponding response message based on the response message and sending the response message to the distributed base station under the condition of receiving the response message;

wherein, the receiving and analyzing module executes the following operations for the received response message:

descrambling the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first part and the physical resource information of the second type channel used by the response message;

and receiving a second part of the response message from the second type channel indicated by the physical resource information, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

14. A random access apparatus for a user equipment in a wireless communication system, the apparatus comprising:

the generating and sending module is used for generating a physical random access signal and sending the physical random access signal to a distributed base station in the wireless communication system;

the receiving and analyzing module is used for receiving and analyzing at least one response message generated by the random access signal processing device; each of the response messages includes a first portion and a second portion, the first portion including a first sub-portion and a second sub-portion, the first sub-portion and the second sub-portion each being transmitted via a first type channel; wherein, for each response message, the first sub-part of the response message carries identification information of the radio frequency signal processing unit corresponding to the user equipment to which the response message is directed, and carries physical resource information used by the second sub-part of the response message; wherein the radio frequency signal processing unit is a remote unit in the distributed base station;

for each response message:

scrambling a first sub-part of the first part based on a random access radio network temporary identity carried by a physical random access signal corresponding to the response message;

scrambling a second sub-portion of the first portion based on identification information of a radio frequency signal processing unit carried by the first sub-portion of the response message;

scrambling said second portion based on identification information of radio frequency signal processing units carried by a first sub-portion of said first portion of the response message;

the response module is used for generating a corresponding response message based on the response message and sending the response message to the distributed base station under the condition of receiving the response message;

wherein, the receiving and analyzing module executes the following operations for the received response message:

descrambling the first sub-part of the first part of the response message according to the random access wireless network temporary identifier carried in the physical random access signal to obtain the identification information of the radio frequency signal processing unit carried in the first sub-part and the physical resource information used by the second sub-part of the response message;

acquiring the second sub-part of the first part of the response message from the obtained physical resource information of the second sub-part, and descrambling the second sub-part according to the identification information of the radio frequency signal processing unit to obtain the physical resource information of the second type channel used by the response message;

and receiving a second part of the response message from the second type channel indicated by the physical resource information of the second type channel, and descrambling the second part according to the identification information of the radio frequency signal processing unit to obtain response data.

15. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, implements the random access signal processing method according to any one of claims 1 to 6.

16. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, implements the random access signal processing method according to any one of claims 7 to 8.

17. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the random access method according to claim 9.

18. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the random access method according to claim 10.

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