TW201743650A - Method and device for use in random access - Google Patents

Abstract

The embodiments of the present invention relate to the technical field of wireless communications, and in particular, to a random access method and apparatus, used to solve the problems in existing technologies wherein, in a current network-intensive deployment scenario, as each cell coverage is smaller, a UE frequently reads random access information in system information while moving, causing the UE to be power-consuming as well as causing processing to be complex. According to the embodiments of the present invention, a network side device transmits, to a terminal, specific random access information identical to one or a plurality of other network side devices, and the terminal carries out random access by means of the identical specific random access information sent by a plurality of network side devices. Due to the same specific random access information sent by the plurality of network side devices, the terminal does not need to frequently read the random access information in the system information of a cell, thus reducing power consumption of the terminal, reducing the complexity of processing and further improving system performance.

Description

Method and device for performing random access

The invention belongs to the field of wireless communication technologies, and in particular relates to a method and device for performing random access.

The contention of the random access means that the eNB (Evolved Base Station) does not allocate a dedicated Preamble (preamble) code for the UE (terminal), but random access that the UE randomly selects the Preamble code and initiates. The competitive random access process is divided into four steps, as shown in Figure 1A. Each step is called a message, and these four steps are called Msg1~Msg4.

Msg1: Send Preamble code.

The eNB is configured to configure the Preamble code and the PRACH (Physical Random Access Channel) resource for transmitting the Preamble code, and broadcast the configuration to the UE camped in the cell through SI (System Information).

Msg2: Random access response.

The eNB sends the Msg2 in the random access response window; the UE receives the Msg2 in the random access response window, and if the reception fails, determines the time to initiate the next random access according to the backoff delay parameter, and selects the random Access resources to initiate the next random access.

Msg3: The first scheduled transmission.

The UE transmits Msg3 on the allocated uplink resource.

Msg4: Competitive solution.

Msg4 contains information related to contention resolution. After the UE receives it, it believes that the competition resolution is successful.

The UE does not receive the Msg4 when the contention timer expires. If the contention fails, the UE determines the time of the next random access according to the backoff delay parameter, and selects the random access resource to initiate the next random access.

Non-contention random access is a random access initiated by the UE using the specified Preamble code on the designated PRACH channel resource according to the eNB indication. Non-competitive random access is divided into three steps, as shown in Figure 1B. Among them, these three steps are called Msg0~Msg2.

Msg0: Random access indication.

The eNB actively requests the designated UE to initiate a random access procedure when the handover and downlink data arrive. Msg0 contains the Preamble code and PRACH channel resources used by the UE to initiate non-contention random access.

Msg1: Send Preamble code.

The UE initiates random access with the specified Preamble code on the PRACH channel resource specified by the eNB. If multiple PRACH channel resources are specified, the UE randomly selects a designated PRACH channel resource for carrying Msg1 in the first available subframe with PRACH channel resources.

Msg2: Random access response.

The format and content of Msg2 is the same as competing random access.

If the UE does not receive the random access response in the random access response window, it determines that the non-contention random access fails, and initiates random access with the specified Preamble code on the next specified PRACH channel resource, which is not subject to the backoff parameter. limit.

Currently, access information such as Preamble codes of each cell is different, and the UE is The random access procedure is initiated according to the indication of the system information when camping in a certain cell, and only the corresponding cell can receive and feedback. In a network-intensive deployment scenario, the coverage of each cell is relatively small. When the UE moves, the random access information in the system information of the cell is frequently read, resulting in power consumption and complexity of the UE.

In summary, in the network-intensive deployment scenario, the coverage of each cell is relatively small, and the UE frequently reads the random access information in the system information of the cell when moving, causing the UE to consume power and process. complex.

The embodiments of the present invention provide a method and a device for performing random access, which are used to solve the problem that the current coverage of the cell is relatively small, and the UE frequently reads when the UE moves. The random access information in the system information of the cell is taken, which causes the UE to consume power and handle complicated problems.

A method for performing random access according to an embodiment of the present invention includes: the network side device determines the same specific random access information as one or more other network side devices; and the network side device selects the specific random access information Send to the terminal to enable the terminal to access through the random access information.

Optionally, the network side device determines the same random access information as the one or more other network side devices, and the network side device receives the specific random access information from the control device.

Optionally, the network side device sends the specific random access information to the terminal. The method includes: the network side device transmitting the specific random access information to the terminal by using a broadcast or a dedicated signal.

Optionally, after the network side device sends the specific random access information to the terminal, the method further includes: receiving, by the network side device, the first message that is sent by the terminal and including the preamble in the random access information; The device sends a second message containing random access response information in a random access response window.

Optionally, after receiving the first message that is sent by the terminal and including the preamble in the random access information, the network side device sends a second message including the random access response information in the random access response window. The network side device reports the first message to the control device, and determines that the first sending indication of the control device is received.

Optionally, the control device notifies the first sending indication to the one or more network side devices; and before the sending, by the network side device random access response window, the second message that includes the random access response information, the method further includes: The network side device and the other network side device receiving the first sending indication use the physical downlink control channel (PDCCH) to schedule the second message at the same time, and are addressed by the RA-RNTI; the network side device random access response window Sending a second message containing random access response information, including: The network side device sends a second message including the same random access response information to other network side devices that receive the first sending indication.

Optionally, the control device notifies the first sending indication to the one or more network side devices; the network side device random access response window sends a second message including the random access response information, including: the network The roadside device sends the second message including the same random access response information through the same time-frequency resource at the same time and other network side devices that receive the first sending indication.

Optionally, the network side device sends the second message that includes the random access response information in the random access response window, including: the uplink resource and the temporary cell radio network temporary identifier configured by the network side device according to the control device. (C-RNTI), transmitting a second message containing random access response information in a random access response window.

Optionally, before the network side device sends the second message that includes the random access response information in the random access response window, the network side device further includes: determining, by the network side device, that the sending condition is met according to the measurement information of receiving the first message.

Optionally, after the network side device sends the second message that includes the random access response information in the random access response window, the network side device further includes: the third message that the network side device receives the contention information of the terminal, and Receiving the measurement information of the third message is sent to the control device; after receiving the second sending indication of the control device, the network side device sends a fourth message including the contention resolution information to the terminal.

A method for performing random access according to an embodiment of the present invention includes: a control device determining specific random access information; and the control device transmitting the specific random access information to a plurality of network side devices to enable the multiple The network side device sends the specific random access information to the terminal, and the terminal accesses the random access information.

Optionally, after the control device sends the specific random access information to the multiple network side devices, the method further includes: the control device receiving, by the multiple network side devices, the random access information sent by the same terminal The first message of the preamble in the medium; the control device selects at least one network side device from the plurality of network side devices, and notifies the selected network side device of the first sending indication, so that the network side device is to the terminal Send a second message containing random access response information.

Optionally, the control device selects at least one network side device from the plurality of network side devices, and the control device selects, according to the measurement information of the first message, each network side device, selects from the multiple network side devices. At least one network side device.

Optionally, the method further includes: the control device allocates different uplink resources and temporary C-RNTIs to the multiple network side devices, so that the network side device receives the random access information sent by the terminal. After the first message of the preamble, the second message including the random access response information is sent in the random access response window by using the uplink resource and the temporary C-RNTI.

Optionally, after the control device sends the specific random access information to the multiple network side devices, the method further includes: the control device receives, by the plurality of network side devices, the third content that is sent by the same terminal and includes the competition information. The message and the measurement information of the plurality of network side devices receiving the third message are sent to the control device; the control device selects at least one network side from the plurality of network side devices according to the measurement information of each network side device receiving the third message. And the device sends the second sending indication to the selected network side device, so that the network side device sends a fourth message including the contention resolution information to the terminal.

A method for performing random access according to an embodiment of the present invention includes: receiving, by a terminal, the same specific random access information sent by multiple network side devices; and performing, by the terminal, random access according to the specific random access information.

Optionally, the terminal performs random access according to the specific random access information, and the terminal sends, by using the time-frequency resource in the specific random access information, to some or all of the network side devices of the plurality of network side devices. And a first message that includes the preamble in the specific random access information; the terminal receives at least one second message that is sent by the network side device and includes the same random access response information.

Optionally, the terminal places the preamble bound to the terminal in the specific random access information in the first message.

Optionally, the terminal places the terminal identifier in the first message.

Optionally, after the terminal receives the second message that is sent by the network side device and includes the same random access response information, the terminal further includes: sending, by the terminal, the content information including the contention information to the at least one network side device that sends the second message. The third message is that the terminal receives the fourth message that is sent by the network side device and includes the contention resolution information.

Optionally, the terminal receives a plurality of second messages; the terminal sends a third message that includes the contention information to the at least one network side device that sends the second message, including: if the uplink in the multiple second messages If the uplink timing advance (UL TA) is different, the terminal selects at least one UL TA, and sends a third message containing the contention information according to the selected UL TA; or if the uplink in the multiple second messages The grant (UL grant) is different from the temporary C-RNTI, and the terminal selects at least one set of UL grants and temporary C-RNTIs, and sends a third message including contention information according to the selected UL grant and the temporary C-RNTI.

Optionally, the terminal sends the third message that includes the contention information according to the selected UL grant and the temporary C-RNTI, including: when the terminal needs to send multiple third messages, according to the selected UL grant, in the same sub-message The third message scrambled with different temporary C-RNTIs is sent on different uplink resources of the frame.

A network side device for performing random access according to an embodiment of the present invention includes: a first information determining module, configured to determine specific random access information that is the same as one or more other network side devices; The first processing module is configured to send the specific random access information to the terminal, so that the terminal accesses the random access information.

Optionally, the first information determining module is specifically configured to: receive the specific random access information from the control device.

Optionally, the first processing module is specifically configured to: send the specific random access information to the terminal by using a broadcast or a dedicated signal.

Optionally, the first processing module is further configured to: receive a first message that is sent by the terminal and include a preamble in the random access information; and send a message that includes random access response information in a random access response window. Two messages.

Optionally, the first processing module is further configured to: report the first message to the control device, and send the include in the random access response window after determining that the first sending indication of the control device is received Random access to the second message of the response message.

Optionally, the control device notifies the first sending indication to the one or more network side devices; the first processing module is further configured to: at the same time as other network side devices that receive the first sending indication The second message is scheduled by using the PDCCH, and is addressed by the RA-RNTI; and the other network side device that receives the first sending indication sends a second message that includes the same random access response information.

Optionally, the control device notifies the first sending indication to the one or more network side devices; the first processing module is specifically configured to: at the same time as other network side devices that receive the first sending indication by The same time-frequency resource transmits a second message containing the same random access response information.

Optionally, the first processing module is configured to: send, according to the uplink resource and the temporary C-RNTI configured by the control device, a second message that includes the random access response information in the random access response window.

Optionally, the first processing module is further configured to: after determining that the sending condition is met according to the measurement information of the received first message, send the second message that includes the random access response information in the random access response window.

Optionally, the first processing module is further configured to: after sending the second message that includes the random access response information in the random access response window, receive the third message of the terminal that includes the competition information, and receive the third message. The measurement information of the third message is sent to the control device; after receiving the second sending indication of the control device, the fourth message including the contention resolution information is sent to the terminal.

A control device for performing random access according to an embodiment of the present invention includes: a second information determining module for determining specific random access information; and a second processing module for using the specific random access The information is sent to the plurality of network side devices, so that the plurality of network side devices send the specific random access information to the terminal, and the terminal accesses the random access information.

Optionally, the second processing module is further configured to: after the specific random access information is sent to the multiple network side devices, receive, by the multiple network side devices, the same terminal, including the random access a first message of the preamble in the information; selecting at least one network side device from the plurality of network side devices, and transmitting the first indication Notifying the selected network side device, so that the network side device sends a second message including random access response information to the terminal.

Optionally, the second processing module is configured to select at least one network side device from the plurality of network side devices according to the measurement information of each network side device receiving the first message.

Optionally, the second processing module is further configured to allocate different uplink resources and temporary C-RNTIs to the network side devices, so that the network side device includes the random access information sent by the receiving terminal. After the first message of the preamble in the medium, the second message including the random access response information is sent in the random access response window by using the uplink resource and the temporary C-RNTI.

Optionally, the second processing module is further configured to: after the specific random access information is sent to the multiple network side devices, receive the information that is sent by the multiple network side devices and is sent by the same terminal and includes the competition information. The third message and the measurement information of the plurality of network side devices receiving the third message are sent to the control device; and the network side device selects at least one network side device from the plurality of network side devices according to the measurement information of the third message received by each network side device. And notifying the selected network side device of the second sending indication, so that the network side device sends a fourth message including the contention resolution information to the terminal.

A terminal for performing random access according to an embodiment of the present invention includes: a receiving module, configured to receive the same specific random access information sent by multiple network side devices; and an access module, configured to use the specific module according to the specific Random access information for random access.

Optionally, the access module is specifically configured to: Transmitting, by the time-frequency resource in the specific random access information, a first message including a preamble in the specific random access information to some or all of the plurality of network side devices; receiving at least one network side The second message sent by the device containing the same random access response information.

Optionally, the access module is further configured to: place the preamble bound to the terminal in the specific random access information into the first message.

Optionally, the access module is further configured to: place the terminal identifier in the first message.

Optionally, the access module is further configured to: after receiving at least one second message that is sent by the network side device and that includes the same random access response information, send the contention to the at least one network side device that sends the second message The third message of the information; receiving the fourth message that is sent by the at least one network side device and includes the contention resolution information.

Optionally, the terminal receives multiple second messages; the access module is specifically configured to: if the UL TAs in the multiple second messages are different, select at least one UL TA, and send according to the selected UL TA. a third message including the contention information; or if the UL grant and the temporary C-RNTI in the plurality of second messages are different, selecting at least one set of UL grants and temporary C-RNTIs, and according to the selected UL grant and the temporary C- The RNTI sends a third message containing the competition information.

Optionally, the access module is specifically configured to: when multiple third messages need to be sent, send different temporary C-RNTI scrambling on different uplink resources of the same subframe according to the selected UL grant. The third message.

A network side device for performing random access, the network side device includes a memory, a processor, and a transceiver; wherein the memory is used to store a computer readable program; the processor runs the memory by using the memory The program in the body is used to implement a method for performing a random access in the network side device in the method for performing random access; the transceiver is configured to receive and send data under the control of the processor.

A control device for performing random access is provided in an embodiment of the present invention, the control device includes a memory, a processor, and a transceiver; wherein the memory is used to store a computer readable program; the processor runs the memory And a program for controlling a device execution method in a method for performing random access provided by an embodiment of the present invention; the transceiver is configured to receive and send data under the control of the processor.

A terminal for performing random access according to an embodiment of the present invention, the terminal includes a memory, a processor, and a transceiver; wherein the memory is used to store a computer readable program; the processor runs the program in the memory The terminal execution method in a method for performing random access provided by the embodiment of the present invention; the transceiver is configured to receive and send data under the control of the processor.

In the embodiment of the present invention, the network side device sends the same specific random access information to the terminal as the one or more other network side devices, and the terminal performs random access by using the same specific random access information sent by the multiple network side devices. Since multiple network side devices send the same specific random access information, the terminal does not need to frequently read random access in the system information of the cell. Information, which reduces terminal power consumption, reduces processing complexity, and further improves system performance.

1000-1001, 1100-1101, 1200-1201, 1301-1305, 1401-1410‧‧

10‧‧‧Network side equipment

800‧‧‧ busbar

20‧‧‧Control equipment

30‧‧‧ Terminal

400‧‧‧First Information Determination Module

401‧‧‧First Processing Module

500‧‧‧Second information determination module

501‧‧‧Second processing module

600‧‧‧ receiving module

601‧‧‧Access Module

700‧‧‧ busbar

701‧‧‧ processor

702‧‧‧ transceiver

703‧‧‧ bus interface

704‧‧‧ memory

705‧‧‧Antenna

801‧‧‧ processor

802‧‧‧ transceiver

803‧‧‧ bus interface

804‧‧‧ memory

805‧‧‧Antenna

900‧‧‧ busbar

901‧‧‧ processor

902‧‧‧ transceiver

903‧‧‧ bus interface

904‧‧‧ memory

905‧‧‧User interface

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying for inventive labor.

1A is a schematic diagram of contention random access in the background art; FIG. 1B is a schematic diagram of non-contention random access in the background art; FIG. 2A is a schematic diagram of each TRP (Transmission Reception Point) of a 5G scenario according to an embodiment of the present invention; FIG. 2B is a schematic diagram of a system in which a plurality of TRPs are a cell according to an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a system for performing random access according to an embodiment of the present invention; FIG. FIG. 5 is a schematic structural diagram of a first type of control device according to an embodiment of the present invention; FIG. 6 is a schematic structural diagram of a first type of terminal according to an embodiment of the present invention; FIG. 8 is a schematic structural diagram of a second control device according to an embodiment of the present invention; FIG. 9 is a schematic structural diagram of a second terminal according to an embodiment of the present invention; FIG. 10 is a first method for performing random access according to an embodiment of the present invention; FIG. 11 is a schematic flowchart of a second method for performing random access according to an embodiment of the present invention; FIG. 12 is a third method for performing random access according to an embodiment of the present invention; Schematic diagram 13 is a schematic flowchart of a method for non-contention random access according to an embodiment of the present invention; FIG. 14 is a schematic flowchart of a method for competing for random access according to an embodiment of the present invention; FIG. 15 is a schematic diagram of a random pre-transmission/back-transmission of a multi-TRP cell according to an embodiment of the present invention; FIG. 16 is a schematic diagram of random access under non-ideal pre-transmission/back-transmission of a multi-TRP cell according to an embodiment of the present invention; FIG. 17 is a schematic diagram of random access under ideal pre-transmission/back-transmission of a virtual cell according to an embodiment of the present invention; In the embodiment of the present invention, a schematic diagram of random access under non-ideal forward/backward transmission of a virtual cell.

In the embodiment of the present invention, the network side device sends the same specific random access information to the terminal as the one or more other network side devices, and the terminal performs random access by using the same specific random access information sent by the multiple network side devices. Since the multiple network side devices send the same specific random access information, the terminal does not need to frequently read the random access information in the system information of the cell, thereby reducing the power consumption of the terminal and reducing the complexity of the processing; System performance.

The solution of the embodiment of the present invention can be applied to any scenario in which network is densely deployed. The following is a scenario of network intensive deployment.

As shown in FIG. 2A and FIG. 2B, the 5G scenario is a scenario in which the network is densely deployed.

1. CU (central unit): A centralized node, also called a central processing unit, can also be called a control device. It can manage and control multiple transmission and reception points (TRPs). A CU can be a high-level node. For example, an independent access network node: a local gateway or a local controller, or a core network node or an OAM (Operation Administration and Maintenance) node; or a Base station, which can be regarded as a super base station because it can manage multiple base stations; it can also be a base frequency processing pool in the C-RAN architecture (where The C-RAN in the embodiment of the present invention may be a centralized radio access network (Centralized-RAN) or a cloud-based wireless access network (Cloud-RAN), and centrally process multiple RRHs (Remote Radio Heads, The baseband signal of the remote radio station; it can also be a CU with a partial protocol stacking function.

2. Base station: The base station is also called TRP (Transmission Reception Point). The TRP can be a large base station, such as eNB, NB (base station), etc. It can also be a small base station, such as LPN (low power). Node (low power node), AP (Access Point, access point), etc.; may also be an RRH in the C-RAN architecture; or a DU (Distributed Unit) having a partial protocol stacking function. There are one or more cells (different frequency points or magnetic zone splitting) under one TRP, or one or more TRPs form a virtual cell.

In a 5G network, many TRPs are controlled by one centralized node (CU), one TRP next TRP cell, or multiple TRPs form a virtual cell, and between the TRP and the CU is an ideal fronthaul/backhaul or Non-ideal forward/backward.

In a 5G network dense deployment scenario, the TRP operates at a frequency below 6 GHz or above 6 GHz. Typical operating bands are below 6 GHz, 3.4 GHz to 3.6 GHz (LTE TDD Band 42); above 6 GHz, outdoor high frequency is 30 GHz, indoor High frequency band 70GHz.

The present invention will be further described in detail with reference to the accompanying drawings, in which . All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 3, the system for performing random access according to an embodiment of the present invention includes: a network side device 10, a control device 20, and a terminal 30.

The network side device 10 is configured to determine the same specific random access information as the one or more other network side devices; send the specific random access information to the terminal; and the control device 20 is configured to determine specific random access information; The specific random access information is sent to a plurality of network side devices. The terminal 30 is configured to receive the same specific random access information sent by the plurality of network side devices, and perform random access according to the specific random access information.

In the embodiment of the present invention, the control device may configure the same specific random access information for multiple network side devices; correspondingly, the network side device receives the specific random access information from the control device.

The specific random access information includes but is not limited to some or all of the following information: Preamble code, Root sequence, Preamble transmit power, PRACH time-frequency resource, Random access response window, and collision resolution timer.

In an implementation, the control device may allocate the same specific random access information to some or all of the network side devices that are managed by the network device. The network side devices may be allocated according to the area, and the network side devices in the same area are allocated the same specific random. Access information.

Optionally, the network side device sends the specific random access information to the terminal by using a broadcast or a dedicated signal, such as an on-demand method.

Specific random access information can be used to compete for random access or non-contention random access procedures. For example, the system information broadcasts specific random access information for competing random access. The proprietary signal is sent with specific random access information for non-contention random access. In an implementation, multiple TRPs can simultaneously transmit specific random access information.

The terminal receives the same specific random access information sent by multiple network side devices. If there is a preamble code in the specific random access information, the terminal may randomly select the preamble; if there is a PRACH in the specific random access information For frequency resources, PRACH time-frequency resources can be randomly selected.

The terminal may send the first message (ie, Msg1) including the selected preamble through the selected PRACH time-frequency resource.

If multiple network side devices synchronously transmit specific random access information, the terminal receives a superposition of multiple synchronization signals, which is beneficial for the terminal to accurately receive random access information.

For contention random access, multiple terminals may select the same Preamble code and different PRACH time-frequency resources; or different Preamble codes and the same PRACH time-frequency resources, so a contention resolution is required.

For non-contention random access, the random access information corresponding to the first message is bound or mapped with the terminal identifier, so no contention resolution is needed.

Optionally, the terminal places the preamble bound to the terminal in the specific random access information in the first message.

The terminal label bound to the terminal may be configured by the network side to the terminal. For example, the control device sends the device to the network side device through the Msg0, and is sent by the network side device to the terminal.

Optionally, the terminal sends, by using the time-frequency resource in the specific random access information, a first message that includes a preamble in the specific random access information to some or all of the network side devices of the multiple network side devices; The network side device receives a first message that is sent by the terminal and includes a preamble in the random access information; the network side device sends a second message that includes random access response information in the random access response window (ie, Msg2) The terminal receives at least one second message sent by the network side device that includes the same random access response information.

There are two ways for the network side device to send the second message in the random access response window. One is the ideal way of forwarding/returning between the network side device and the control device, and the other is between the network side device and the control device. It is a non-ideal prequel/return method, which is described in detail below.

First, the network side device and the control device are the ideal way to forward/return.

In this manner, after receiving the first message that is sent by the terminal and including the preamble in the random access information, the network side device reports the first message to the control device; correspondingly, the control device receives multiple networks. a first message sent by the same device to the same terminal that includes the preamble in the random access information; the control device selects at least one network side device from the plurality of network side devices, and sends the first sending indication Notifying the selected network side device; the network side device determines to send the second message including the random access response information in the random access response window after receiving the first sending indication of the control device.

Optionally, the control device selects at least one network side device from the plurality of network side devices, and selects at least one network from the plurality of network side devices according to the measurement information of the first message received by each network side device. Roadside equipment.

For example, the control device selects the best network side device to receive the signal and responds to the second cancellation. Or select some or all of the network side devices from the plurality of network side devices whose received signals satisfy the condition to reply to the same second message.

Specifically, the control device selects the network side device with the highest received signal strength according to the measurement information; or the control device selects the network side device with the best signal quality according to the measurement information; or the control device selects the received signal strength according to the measurement information to meet the first threshold and/or Or some or all network side devices whose signal quality meets the second threshold. Optionally, if multiple network side devices are selected, multiple network side devices reply the same second message, which may be for reliability transmission. The first threshold and the second threshold may be configured by the control device, configured by the network side device, or manually configured.

After receiving the first sending indication, the one or more network side devices send the second message in the random access response window. The PDCCH (Single Frequency Network) transmission is equivalent to SFN (Single Frequency Network) transmission when the second network side device sends the second message.

Optionally, the network side device and the other network side device that receives the first sending indication use the PDCCH (Physical Downlink Control Channel) to schedule the second message at the same time, and are addressed by the RA-RNTI. The network side device sends a second message including the same random access response information to other network side devices that receive the first sending indication.

Specifically, the multiple network side devices use the PDCCH to schedule the second device at the same time, and are addressed by the RA-RNTI; the multiple network side devices schedule the second message on the same PDCCH resource (for example, CCE). The content of the scheduled second message is the same, that is, the parameters included in Msg2 are the same. Or the network side device of the multiple network side devices uses the PDCCH to schedule the second message, and the multiple network side devices send the second message of the same content on the same time-frequency resource at the same time. If the network side device schedules the second message, the resource for sending the second message may be that the control device notifies other network side devices, so that multiple network side devices simultaneously send the same second message. Of course, it can also be specified in the agreement.

Second, the network side device and the control device are non-ideal forward/backhaul.

This method is to reduce the access delay, so the multiple network side devices send the second message without coordination by the control device.

If the non-ideal forward/return is ideal for the delay and the delivery is not ideal, the second message sent by the control device can be sent, similar to the operation of the ideal pre-transmission/retransmission, and will not be described here.

The following is an operation in which the non-ideal forward/backhaul delay is not ideal.

The control device allocates different uplink resources and temporary C-RNTIs to the multiple network side devices; correspondingly, after receiving the first message sent by the terminal and including the preamble in the random access information, the network side device And transmitting, according to the uplink resource and the temporary CRNTI configured by the control device, a second message including the random access response information in the random access response window.

Specifically, the control device allocates different uplink resources and a temporary C-RNTI (Cell Radio Network Temporary Identifier) to the plurality of network side devices that send the same random access information in advance to ensure no collision.

After receiving the first message sent by the terminal, the multiple network side devices A second message is generated and the second message is sent within the random access response window. The second message generated by the multiple network side devices may be the same or different. If different, the uplink resource and the temporary C-RNTI (with the RA-RNTI (random access-radio network temporary identifier) included in the second message. The random access-radio network temporary identifier is similar, and the role is addressed. The fallback parameter, UL TA (uplink timing advance) may be the same or different, and the Preamble code corresponding to the first message is the same. The RA-RNTI used for addressing is the same.

Further, the network side device determines whether the sending condition is met according to the measurement information of the first message, and sends a second message including the random access response information in the random access response window after determining that the sending condition is met.

The plurality of network side devices determine, according to the measurement information of the received first message, whether the condition is met, for example, whether the received signal strength satisfies the third threshold value and/or whether the signal quality meets the fourth threshold value, and the network side device that satisfies the condition replies to the second Message.

In order to reduce the access delay time, the terminal places the terminal identifier in the first message for simplifying the random access process, for example, changing the 4-step random access into a 2-step random access.

Since the first message includes the terminal identification information, the control device acquires the context of the terminal through the terminal identification information. This process requires the control device to interact with the CN (core network) (for example, authentication during initial access, The process of authentication or the like, or the UE is identified during the handover, so that the plurality of network side devices send the first message to the control device, and the control device schedules the network side device to send the second message, which is similar to the operation of the ideal forward/backhaul operation. , will not repeat them here. Since the control device has identified the terminal through the first message, the terminal does not need to perform contention resolution.

For non-contention random access procedures, the terminal successfully receives one in the random response window. The intervention process is terminated by one or more second messages.

If the terminal fails to receive, according to the backoff delay parameter, the time at which the next random access is initiated is determined, and the random access resource is selected to initiate the next random access.

For a contention random access procedure, the terminal needs to perform contention resolution, so after the terminal successfully receives one or more second messages in the random response window, the terminal sends the content including the competition information to the at least one network side device that sends the second message. Three messages.

Correspondingly, the network side device sends the received third message containing the competition information of the terminal and the measurement information that receives the third message to the control device; the control device receives the same report from multiple network side devices. The third message that includes the contention information sent by the terminal and the measurement information that the plurality of network side devices receive the third message are sent to the control device; the control device receives the measurement information of the third message according to each network side device, The plurality of network side devices select at least one network side device, and notify the selected network side device of the second sending indication, so that the network side device sends a fourth message including contention resolution information to the terminal; the network side device is After receiving the second sending indication of the control device, the terminal sends a fourth message including the contention resolution information to the terminal; the terminal receives the fourth message that is sent by the network side device and includes the contention resolution information.

The third message sent by the terminal includes terminal identifier information (for example, Initial UE-Identity or Reestab UE-Identity) and/or C-RNTI of the terminal.

If the terminal receives a second message in the random response window, the terminal according to the The information contained in the second message sends a third message.

If the terminal receives multiple second messages sent by multiple network side devices in the random response window, the terminal may select one or more second messages, and send a third message according to the information in the selected second message. Specifically, if the UL TAs included in the multiple second messages are different, the terminal selects one UL TA to send one or more third messages. If the UL grant and the temporary C-RNTI included in the multiple second messages are different, the medium terminal may select one or more sets of UL grants (uplink grants) and temporary C-RNTIs to send one or more third messages.

Specifically, if the UL TAs in the multiple second messages are different, the terminal selects at least one UL TA, and sends a third message including the competition information according to the selected UL TA; or if the multiple messages in the multiple second messages The UL grant is different from the temporary C-RNTI, and the terminal selects at least one set of UL grants and temporary C-RNTIs, and sends a third message including contention information according to the selected UL grant and the temporary C-RNTI.

Further, when the terminal receives multiple second messages sent by multiple network side devices in the same subframe, and the terminal sends multiple third messages, if the UL grant and the temporary C-RNTI are different, the UE is in the same sub The third message with the same content but different scrambling is sent on different uplink resources of the frame. That is, the terminal sends the third message that is scrambled by using different temporary C-RNTIs on different uplink resources of the same subframe according to the selected UL grant, where the content of the multiple third messages that need to be sent is the same.

Because the identifier information included in the third message and/or the C-RNTI of the terminal needs to be processed by the control device, the one or more network side devices send the third message to the control device, and report the third message. Measurement information, including received signal strength, signal quality, etc.

The control device identifies the terminal through the terminal identification information and/or the C-RNTI of the terminal, performs a contention resolution decision, and schedules the network side device to send a fourth message, that is, selects the best network side device to send the fourth message or meets the condition. The network side devices send the same fourth message.

Specifically, if the terminal indicated by the third message sent by the one or more network side devices is the same, the control device performs a contention resolution decision, and schedules the network side device to send a fourth message, where the fourth message includes the terminal. If the terminal indicated by the third message sent by the one or more network side devices is different, the control device performs a contention resolution decision, and schedules the network side device to send a fourth message, where the fourth message is included in the fourth message. Competition resolution information for different terminals.

After receiving the fourth message containing the information related to the competition resolution, the terminal considers that the contention resolution is successful.

If the terminal fails to receive the second message, it determines the moment to initiate the next random access according to the backoff delay parameter, and selects the random access resource to initiate the next random access.

If the terminal fails to receive the fourth message, it determines the moment to initiate the next random access according to the backoff delay parameter, and selects the random access resource to initiate the next random access.

The network side device in the embodiment of the present invention may be a base station, where the base station may also be referred to as a TRP, and the TRP may be a large base station, such as an eNB or an NB. The network side device in the embodiment of the present invention may also be a small base. For example, the network side device in the embodiment of the present invention may also be an RRH in the C-RAN architecture. The network side device in the embodiment of the present invention may also be a DU having a partial protocol stacking function.

As shown in FIG. 4, the first network side device in the embodiment of the present invention includes: The first information determining module 400 is configured to determine the same specific random access information as the one or more other network side devices. The first processing module 401 is configured to send the specific random access information to the terminal, so that The terminal accesses through the random access information.

Optionally, the first information determining module 400 is specifically configured to: receive the specific random access information from the control device.

Optionally, the first processing module 401 is specifically configured to: send the specific random access information to the terminal by using a broadcast or a dedicated signal.

Optionally, the first processing module 401 is further configured to: receive a first message that is sent by the terminal and include a preamble in the random access information; and send a random access response message in the random access response window. Second message.

Optionally, the first processing module 401 is further configured to report the first message to the control device, and send the random access response window after determining to receive the first sending indication of the control device. A second message containing random access response information.

Optionally, the control device notifies the first sending indication to the one or more network side devices; the first processing module 401 is further configured to: be the same as the other network side devices that receive the first sending indication The second message is scheduled by using the PDCCH, and is addressed by the RA-RNTI; and the other network side device that receives the first sending indication sends the second message that includes the same random access response information.

Optionally, the control device notifies the first sending indication to one or more network side devices; The first processing module 401 is specifically configured to: send, by using the same time-frequency resource, the second message that includes the same random access response information at the same time as other network side devices that receive the first sending indication.

Optionally, the first processing module 401 is configured to: send, according to the uplink resource and the temporary CRNTI configured by the control device, a second message that includes the random access response information in the random access response window.

Optionally, the first processing module 401 is further configured to: after determining that the sending condition is met according to the measurement information of the received first message, send the second message that includes the random access response information in the random access response window.

Optionally, the first processing module 401 is further configured to: after sending the second message that includes the random access response information in the random access response window, receive the received third message of the terminal that includes the competition information, and Receiving the measurement information of the third message is sent to the control device; after receiving the second sending indication of the control device, sending a fourth message including the contention resolution information to the terminal.

As shown in FIG. 5, the first control device of the embodiment of the present invention includes: a second information determining module 500 for determining specific random access information; and a second processing module 501 for using the specific random access information. Sending to a plurality of network side devices, so that the plurality of network side devices send the specific random access information to the terminal, and the terminal accesses by using the random access information.

Optionally, the second processing module 501 is further configured to: after the specific random access information is sent to the multiple network side devices, receive, by the multiple network side devices, the same terminal, and the random storage Take the first elimination of the preamble in the message Selecting at least one network side device from the plurality of network side devices, and notifying the selected network side device of the first sending indication, so that the network side device sends the second terminal including the random access response information to the terminal Message.

Optionally, the second processing module 501 is configured to select at least one network side device from the plurality of network side devices according to the measurement information of each network side device receiving the first message.

Optionally, the second processing module 501 is further configured to: allocate different uplink resources and temporary C-RNTIs to the multiple network side devices, so that the network side device includes the random access sent by the receiving terminal. After the first message of the preamble in the information, the second message including the random access response information is sent in the random access response window by using the uplink resource and the temporary C-RNTI.

Optionally, the second processing module 501 is further configured to: after the specific random access information is sent to the multiple network side devices, receive the information that is sent by the multiple network side devices and is sent by the same terminal and includes the contention information. The third message and the measurement information that the plurality of network side devices receive the third message are sent to the control device; and the at least one network side device is selected from the plurality of network side devices according to the measurement information of the third message received by each network side device. And notifying the selected network side device of the second sending indication, so that the network side device sends a fourth message including the contention resolution information to the terminal.

As shown in FIG. 6, the first terminal of the embodiment of the present invention includes: a receiving module 600, configured to receive the same specific random access information sent by multiple network side devices; and an access module 601, according to the specific Random access information for random access.

Optionally, the access module 601 is configured to send, by using the time-frequency resource in the specific random access information, part or all of the network side devices of the plurality of network side devices to include the specific random access information. The first message of the preamble; receiving at least one second message sent by the network side device and containing the same random access response information.

Optionally, the access module 601 is further configured to: place the preamble bound to the terminal in the specific random access information into the first message.

Optionally, the access module 601 is further configured to: place the terminal identifier in the first message.

Optionally, the access module 601 is further configured to: after receiving at least one second message that is sent by the network side device and that includes the same random access response information, send, to the at least one network side device that sends the second message, The third message of the competition information; receiving the fourth message that is sent by the at least one network side device and includes the contention resolution information.

Optionally, the terminal receives multiple second messages; the access module 601 is specifically configured to: if the UL TAs in the multiple second messages are different, select at least one UL TA, and according to the selected UL TA Sending a third message including contention information; or if the UL grant and the temporary C-RNTI in the plurality of second messages are different, selecting at least one group of UL grants and temporary C-RNTIs, and according to the selected UL grant and temporary C - The RNTI sends a third message containing the competition information.

Optionally, the access module 601 is specifically configured to: when multiple third messages need to be sent, according to the selected UL grant, in the same subframe The third message scrambled by different temporary C-RNTIs is sent on different uplink resources.

As shown in FIG. 7, a second network side device according to an embodiment of the present invention includes: a processor 701, configured to read a program in the memory 704, and perform the following process: determining the same specificity as one or more other network side devices. Random access information; the specific random access information is transmitted to the terminal through the transceiver 702, so that the terminal accesses through the random access information.

The transceiver 702 is configured to receive and send data under the control of the processor 701.

Optionally, the processor 701 is specifically configured to: receive the specific random access information from the control device.

Optionally, the processor 701 is specifically configured to: send the specific random access information to the terminal by using a broadcast or a dedicated signal.

Optionally, the processor 701 is further configured to: receive a first message that is sent by the terminal and include a preamble in the random access information; and send a second message that includes the random access response information in the random access response window. .

Optionally, the processor 701 is further configured to report the first message to the control device, and after determining to receive the first sending indication of the control device, send the random access in the random access response window. Take the second message in response to the message.

Optionally, the control device notifies the first sending indication to the one or more network side devices; the processor 701 is further configured to: use the PDCCH at the same time as other network side devices that receive the first sending indication. Scheduling the second message and addressing by RA-RNTI; and other network side receiving the first sending indication The device sends a second message containing the same random access response information.

Optionally, the control device notifies the first sending indication to the one or more network side devices; the processor 701 is specifically configured to: pass the same time at the same time as other network side devices that receive the first sending indication The time-frequency resource sends a second message containing the same random access response information.

Optionally, the processor 701 is specifically configured to: send, according to the uplink resource and the temporary C-RNTI configured by the control device, a second message that includes the random access response information in the random access response window.

Optionally, the processor 701 is further configured to: after determining that the sending condition is met according to the measurement information of the received first message, send the second message that includes the random access response information in the random access response window.

Optionally, the processor 701 is further configured to: after sending the second message that includes the random access response information in the random access response window, receive the third message of the terminal that includes the contention information, and receive the third message. The measurement information of the three messages is sent to the control device; after receiving the second sending indication of the control device, the fourth message including the contention resolution information is sent to the terminal.

The sending and receiving of the processor 701 are performed by the transceiver 702.

In FIG. 7, a busbar architecture (represented by busbar 700), busbar 700 can include any number of interconnected busbars and bridges, and busbar 700 will include one or more processors represented by processor 701. And various circuits of the memory represented by the memory 704 are connected together. Busbar 700 can also couple various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art and, therefore, will not be further described herein. The bus interface 703 provides an interface between the bus bar 700 and the transceiver 702. Transceiver 702 can be an element or a plurality of elements, such as multiple receivers and transmitters, providing means for communicating with various other devices on a transmission medium. The data processed by the processor 701 is transmitted over the wireless medium via the antenna 705. Further, the antenna 705 also receives the data and transmits the data to the processor 701.

The processor 701 is responsible for managing the bus bar 700 and the usual processing, and can also provide various functions including timing, peripheral interface, voltage regulation, power management, and other control functions. The memory 704 can be used to store the data used by the processor 701 in performing the operations.

Optionally, the processor 701 may be a CPU (Central Embedded Device), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable). Logic Device, complex programmable logic device).

As shown in FIG. 8, the second control device of the embodiment of the present invention includes: a processor 801 for reading a program in the memory 804, performing the following process: determining specific random access information; and the specific The random access information is sent to the plurality of network side devices, so that the plurality of network side devices send the specific random access information to the terminal, and the terminal accesses the random access information.

The transceiver 802 is configured to receive and send data under the control of the processor 801.

Optionally, the processor 801 is further configured to: after sending the specific random access information to multiple network side devices, receive multiple network sides. The first message sent by the device and sent by the same terminal, including the preamble in the random access information; selecting at least one network side device from the plurality of network side devices, and notifying the first sending indication of the selected message The network side device, so that the network side device sends a second message including random access response information to the terminal.

Optionally, the processor 801 is specifically configured to: select, according to the measurement information of the first message, each network side device, to select at least one network side device from the multiple network side devices.

Optionally, the processor 801 is further configured to allocate different uplink resources and temporary C-RNTIs to the multiple network side devices, so that the network side device is included in the received random access information sent by the terminal. After the first message of the preamble, the second message including the random access response information is sent in the random access response window by using the uplink resource and the temporary C-RNTI.

Optionally, the processor 801 is further configured to: after sending the specific random access information to the multiple network side devices, receive the third message that is sent by the multiple network side devices and is sent by the same terminal and includes the competition information. And the measurement information that the plurality of network side devices receive the third message is sent to the control device; according to the measurement information of the third message received by each network side device, at least one network side device is selected from the plurality of network side devices, and The second sending indication notifies the selected network side device, so that the network side device sends a fourth message including the contention resolution information to the terminal.

The sending and receiving of the processor 801 are performed by the transceiver 802.

In Figure 8, the busbar architecture (represented by busbar 800), busbar 800 Any number of interconnected bus bars and bridges can be included, and bus bar 800 will include various circuits including one or more processors represented by processor 801 and memory represented by memory 804. Bus 800 can also couple various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein. The bus interface 803 provides an interface between the bus bar 800 and the transceiver 802. Transceiver 802 can be an element or a plurality of elements, such as multiple receivers and transmitters, providing means for communicating with various other devices on a transmission medium. The data processed by the processor 801 is transmitted over the wireless medium via the antenna 805. Further, the antenna 805 also receives the data and transmits the data to the processor 801.

The processor 801 is responsible for managing the bus bar 800 and the usual processing, and can also provide various functions including timing, peripheral interface, voltage regulation, power management, and other control functions. The memory 804 can be used to store the data used by the processor 801 in performing the operations.

Optionally, the processor 801 can be a CPU, an ASIC, an FPGA, or a CPLD.

As shown in FIG. 9, the second terminal of the embodiment of the present invention includes: a processor 901, configured to read a program in the memory 904, and perform the following process: receiving, by the transceiver 902, the same specificity sent by multiple network side devices. Random access information; random access based on the particular random access information.

The transceiver 902 is configured to receive and send data under the control of the processor 901.

Optionally, the processor 901 is configured to: send, by using a time-frequency resource in the specific random access information, a preamble in the specific random access information to some or all of the network side devices of the multiple network side devices. The first message of the code; receiving at least one second cancellation message sent by the network side device and containing the same random access response information interest.

Optionally, the processor 901 is further configured to: place the preamble bound to the terminal in the specific random access information into the first message.

Optionally, the processor 901 is further configured to: place the terminal identifier in the first message.

Optionally, the processor 901 is further configured to: after receiving the second message that is sent by the network side device and that includes the same random access response information, send the contention information to the at least one network side device that sends the second message. The third message is received by the at least one network side device and includes a fourth message including contention resolution information.

Optionally, the terminal receives multiple second messages. The processor 901 is specifically configured to: if the UL TAs in the multiple second messages are different, select at least one UL TA, and send the included according to the selected UL TA. a third message of the competition information; or if the UL grant and the temporary C-RNTI in the plurality of second messages are different, selecting at least one set of UL grants and temporary C-RNTIs, and according to the selected UL grant and the temporary C-RNTI Send a third message containing the competition information.

Optionally, the processor 901 is configured to: when the multiple third messages need to be sent, send the different temporary C-RNTI scrambled on different uplink resources of the same subframe according to the selected UL grant. Third message.

The sending and receiving of the processor 901 are performed by the transceiver 902.

In Figure 9, the busbar architecture (represented by busbar 900), busbar 900 Any number of interconnected bus bars and bridges can be included, and bus bar 900 will include various circuits including one or more processors represented by general purpose processor 901 and memory represented by memory 904. Busbar 900 can also couple various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art and, therefore, will not be further described herein. The bus interface 903 provides an interface between the bus bar 900 and the transceiver 902. Transceiver 902 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium. For example, transceiver 902 receives external data from other devices. The transceiver 902 is configured to send the processed data of the processor 901 to other devices. Depending on the nature of the computing system, a user interface 905 can also be provided, such as a keypad, display, speaker, microphone, joystick.

The processor 901 is responsible for managing the bus bar 900 and the usual processing, as described above for running the general operating system. The memory 904 can be used to store data used by the processor 901 in performing operations.

Optionally, the processor 901 can be a CPU, an ASIC, an FPGA, or a CPLD.

Based on the same inventive concept, a method for performing random access is also provided in the embodiment of the present invention. The principle of solving the problem is similar to the system for performing random access in the embodiment of the present invention. Therefore, the implementation of the method can be found in the system. The implementation of the network side device will not be repeated here.

As shown in FIG. 10, the method for performing random access in the first embodiment of the present invention includes: Step 1000: The network side device determines the same specific random access information as one or more other network side devices; Step 1001: The network side device sends the specific random access information to the terminal, so that the terminal accesses by using the random access information.

Optionally, the network side device determines the same random access information as the one or more other network side devices, and the network side device receives the specific random access information from the control device.

Optionally, the network side device sends the specific random access information to the terminal, where the network side device sends the specific random access information to the terminal by using a broadcast or dedicated signal.

Optionally, after the network side device sends the specific random access information to the terminal, the method further includes: receiving, by the network side device, the first message that is sent by the terminal and including the preamble in the random access information; The device sends a second message containing random access response information in a random access response window.

Optionally, after receiving the first message that is sent by the terminal and including the preamble in the random access information, the network side device sends a second message including the random access response information in the random access response window. The network side device reports the first message to the control device, and determines that the first sending indication of the control device is received.

Optionally, the control device notifies the first sending indication to one or more network side devices; Before the second message that includes the random access response information is sent in the random access response window of the network side device, the network side device uses the physical downlink control at the same time as the other network side device that receives the first sending indication. The channel (PDCCH) schedules the second message and is addressed by the RA-RNTI; the network side device random access response window sends a second message including the random access response information, including: the network side device receives the first Another network side device that sends the indication sends a second message containing the same random access response information.

Optionally, the control device notifies the first sending indication to the one or more network side devices; the network side device random access response window sends a second message including the random access response information, including: the network The roadside device sends the second message including the same random access response information through the same time-frequency resource at the same time and other network side devices that receive the first sending indication.

Optionally, the network side device sends the second message that includes the random access response information in the random access response window, including: the uplink resource and the temporary cell radio network temporary identifier configured by the network side device according to the control device. (C-RNTI), transmitting a second message containing random access response information in a random access response window.

Optionally, before the network side device sends the second message that includes the random access response information in the random access response window, the network side device further includes: determining, by the network side device, that the sending condition is met according to the measurement information of receiving the first message.

Optionally, after the network side device sends the second message that includes the random access response information in the random access response window, the network side device further includes: the third message that the network side device receives the contention information of the terminal, and Receiving the measurement information of the third message is sent to the control device; after receiving the second sending indication of the control device, the network side device sends a fourth message including the contention resolution information to the terminal.

Based on the same inventive concept, a method for performing random access is also provided in the embodiment of the present invention. The principle of solving the problem is similar to the system for performing random access in the embodiment of the present invention. Therefore, the implementation of the method can be found in the system. The implementation of the control device will not be repeated here.

As shown in FIG. 11, the method for performing random access in the second embodiment of the present invention includes: Step 1100: The control device determines specific random access information; Step 1101: The control device sends the specific random access information to multiple The network side device is configured to enable the plurality of network side devices to send the specific random access information to the terminal, and the terminal accesses the random access information.

Optionally, after the control device sends the specific random access information to the multiple network side devices, the method further includes: the control device receiving, by the multiple network side devices, the random access information sent by the same terminal The first message of the preamble in the medium; the control device selects at least one network side device from the plurality of network side devices, and notifies the selected network side device of the first sending indication, so that the network side device is to the terminal Sending package A second message containing random access response information.

Optionally, the control device selects at least one network side device from the plurality of network side devices, and the control device selects, according to the measurement information of the first message, each network side device, selects from the multiple network side devices. At least one network side device.

Optionally, the method further includes: the control device allocates different uplink resources and temporary C-RNTIs to the multiple network side devices, so that the network side device receives the random access information sent by the terminal. After the first message of the preamble, the second message including the random access response information is sent in the random access response window by using the uplink resource and the temporary C-RNTI.

Optionally, after the control device sends the specific random access information to the multiple network side devices, the method further includes: the control device receives, by the plurality of network side devices, the third content that is sent by the same terminal and includes the competition information. The message and the measurement information of the plurality of network side devices receiving the third message are sent to the control device; the control device selects at least one network side from the plurality of network side devices according to the measurement information of each network side device receiving the third message. And the device sends the second sending indication to the selected network side device, so that the network side device sends a fourth message including the contention resolution information to the terminal.

Based on the same inventive concept, a method for performing random access is also provided in the embodiment of the present invention. The principle of solving the problem is similar to the system for performing random access in the embodiment of the present invention. Therefore, the implementation of the method can be found in the system. The implementation of the terminal will not be repeated here.

As shown in FIG. 12, the third method for performing random access in the embodiment of the present invention includes: Step 1200: A terminal receives the same specific random access information sent by multiple network side devices; Step 1201: The terminal is randomly selected according to the specific Access information for random access.

Optionally, the terminal performs random access according to the specific random access information, and the terminal sends, by using the time-frequency resource in the specific random access information, to some or all of the network side devices of the plurality of network side devices. And a first message that includes the preamble in the specific random access information; the terminal receives at least one second message that is sent by the network side device and includes the same random access response information.

Optionally, the terminal places the preamble bound to the terminal in the specific random access information in the first message.

Optionally, the terminal places the terminal identifier in the first message.

Optionally, after the terminal receives the second message that is sent by the network side device and includes the same random access response information, the terminal further includes: sending, by the terminal, the content information including the contention information to the at least one network side device that sends the second message. The third message is that the terminal receives the fourth message that is sent by the network side device and includes the contention resolution information.

Optionally, the terminal receives the second message that is sent by the terminal to the at least one network side device that sends the second message, including: If the uplink timing advance UL TA in the plurality of second messages is different, the terminal selects at least one UL TA, and sends a third message including contention information according to the selected UL TA; or if the multiple second message The uplink grant UL grant is different from the temporary C-RNTI, and the terminal selects at least one set of UL grants and temporary C-RNTIs, and sends a third message including contention information according to the selected UL grant and the temporary C-RNTI.

Optionally, the terminal sends the third message that includes the contention information according to the selected UL grant and the temporary C-RNTI, including: when the terminal needs to send multiple third messages, according to the selected UL grant, in the same sub-message The third message scrambled with different temporary C-RNTIs is sent on different uplink resources of the frame.

In the following scenario, in a 5G network dense deployment scenario, multiple TRPs send the same specific random access information, and the UE and multiple TRPs perform random access scenarios to describe the non-contention random access and the contention random access of the present invention. See Figure 13 and Figure 14.

As shown in FIG. 13, the method for non-contention random access according to an embodiment of the present invention includes: Step 1301: A CU configures multiple TRPs with the same specific random access information.

The specific random access information includes a Preamble code, a Root sequence, a Preamble transmission power, a PRACH time-frequency resource, a random access response window, a conflict resolution timer, and the like.

Step 1302: Multiple TRPs send the same specific random access information.

The specific random access information may be broadcast to the UE in the system information, or may be sent in an on-demand manner, that is, transmitted through a proprietary signal. Specific random access information can be used to compete for random access or non-contention random access procedures. For example, the system information broadcasts specific random access information for competing random access, while the proprietary signal is sent for non-competitive random access. Specific random access information. In addition, multiple TRPs need to be sent synchronously.

Step 1303: The UE acquires the same specific random access information sent by multiple TRPs, and sends Msg1.

That is, after the UE randomly selects a certain Preamble code and a certain PRACH time-frequency resource indicated in the specific random access information, the UE transmits the Preamble code on the PRACH time-frequency resource. Since multiple TRPs are synchronously transmitted, the UE receives a superposition of multiple synchronization signals when receiving, which is beneficial for the UE to accurately receive specific random access information.

For non-contention random access, the specific random access information corresponding to Msg1 is bound or mapped with the UE identifier, so no contention resolution is needed.

In order to reduce the access delay time, Msg1 may include UE identification information for simplifying the random access process, for example, changing 4-step random access into 2-step random access.

Step 1304: After receiving multiple Msg1s sent by the UE, multiple TRPs adjacent to the UE send Msg2 in the random access response window.

Msg2 includes a backoff parameter, a Preamble code corresponding to Msg1, an uplink transmission timing advance (UL TA), an uplink resource (UL grant), and a temporary C-RNTI (for security).

The TRP uses the PDCCH to schedule the Msg2 and is addressed by the RA-RNTI. The RA-RNTI=1+t_id+10*f_id, that is, the RA-RNTI is determined by the PRACH time-frequency resource location carrying the Msg1.

There are two ways for TRP to send Msg2 in the random access response window. One is the ideal pre-transmission/back-transmission between TRP and CU, and the other is the non-ideal pre-transmission/retransmission between TRP and CU. Introduce in detail.

1. The ideal prequel/return between TRP and CU.

1. Multiple TRPs send Msg1 to the CU, and report the measurement information of the received Msg1, including the received signal strength and signal quality.

2. The CU judges that the plurality of TRPs receive the Msg1 of the same UE through the same Preamble code and the PRACH time-frequency resource in the Msg1, thereby performing coordination processing, selecting a best TRP reply Msg2, or multiple receiving. The TRP whose signal satisfies the condition replies to the same Msg2.

Specifically, the TRP with the highest received signal strength or the TRP with the best signal quality is selected according to the measurement information of the received Msg1, or multiple TRPs whose received signal strength and signal quality meet the preset threshold are selected. Selecting a plurality of received signals that satisfy the condition of the TRP replies to the same Msg2 for reliability transmission. The preset threshold can be configured by the CU or by the TRP self-configuration.

3. One or more TRPs receive an indication that the CU sends Msg2, and send Msg2 in the random access response window.

Due to the coordinated processing by the CU, when multiple TRPs transmit Msg2, they may be multi-point transmit diversity transmission, which is equivalent to SFN (Single Frequency Network) transmission. Specifically, multiple TRPs use the PDCCH scheduling Msg2 at the same time, and are addressed by the RA-RNTI. Multiple TRPs schedule Msg2 on the same PDCCH resource (for example, CCE), and the content of the scheduled Msg2 is the same, that is, Msg2. The included parameters are the same. Or one of the plurality of TRPs uses the PDCCH scheduling Msg2, and the plurality of TRPs send the Msg2 of the same content on the same time-frequency resource at the same time.

Second, between TRP and CU is non-ideal forward/backward.

Non-ideal forward/backhaul between TRP and CU, in order to reduce access latency, multiple TRPs Send Msg2 without CU coordination. If the non-ideal forward/return is ideal for delay and the delivery volume is not ideal, the CU coordinated Msg2 transmission can be performed, analogous to the ideal pre-transmission/retransmission operation. The following is an operation in which the non-ideal forward/backhaul delay is not ideal.

1. The CU allocates different uplink resources to the multiple TRPs that send the same specific random access information in advance, and the temporary C-RNTI ensures no conflict.

2. After receiving multiple Msg1s sent by the UE, multiple TRPs respectively generate Msg2 with different contents and send Msg2 in the random access response window.

The uplink resource and the temporary C-RNTI included in the Msg2 are different, and the fallback parameter and the UL TA may be the same or different, and the Preamble code corresponding to the Msg1 is the same, and the RA-RNTI used for addressing is the same. Further, the plurality of TRPs determine whether the condition is met according to the measurement information of the received Msg1, for example, whether the received signal strength and the signal quality satisfy a preset threshold, and the TRP that satisfies the condition is Msg2.

Since there is no CU coordination, multiple TRPs may use the PDCCH scheduling Msg2 at the same time. If different PDCCH resource scheduling Msg2, the UE may correctly receive multiple different Msg2. If the same PDCCH resource scheduling Msg2, the UE may be correct. Receiving multiple different Msg2 may not be resolved. This is because multiple TRPs schedule Msg2 on the same PDCCH resource at the same time, and the transmission signal strengths of multiple TRPs are equivalent and interfere with each other. The probability of such resolution is extremely small, and this problem also exists in existing LTE systems.

In the implementation, if the Msg1 includes the UE identification information, the CU needs to obtain the context of the UE by using the UE identification information. This process requires the CU to interact with the core network CN (for example, authentication, authentication, etc. during initial access). , or identify the UE when switching, so multiple TRPs send Msg1 to the CU, and the Msg2 is coordinated by the CU. This way and the ideal prequel/ The operation of the return is similar, and will not be described here. Since the CU has already identified the UE through Msg1, the UE does not need to perform a contention resolution.

Step 1305: The UE successfully receives one or more Msg2s in the random response window, and the non-contention random access is completed.

If the UE fails to receive, the time of the next random access is determined according to the backoff delay parameter, and the random access resource is selected to initiate the next random access.

As shown in FIG. 14, the method for competing for random access in the embodiment of the present invention includes: Steps 1401 to 1404 are the same as steps 1301 to 1304, and details are not described herein again.

The difference is that in step 1403, for the contention random access, multiple UEs may select the same Preamble code and different PRACH time-frequency resources; or may select different Preamble codes and the same PRACH time-frequency resources.

Step 1405: The UE successfully receives one or more Msg2s in the random response window.

If the UE fails to receive, the time of the next random access is determined according to the backoff delay parameter, and the random access resource is selected to initiate the next random access.

The situation in which multiple UEs perform contention resolution is similar to the existing LTE system. For example, UE1 and UE2 initiate contention random access, and the information of Msg1 and Msg2 is as shown in the following table.

Step 1406: The UE sends Msg3 to one or more TRPs.

The Msg3 includes UE identification information (for example, Initial UE-Identity or Reestab UE-Identity) or a C-RNTI of the UE.

If the UE receives an Msg2 in the random response window, Msg3 is sent according to the information contained in the Msg2.

If the UE receives multiple Msg2s sent by multiple TRPs in a random response window, the UE may select one or more to send Msg3.

Specifically, if the UL TAs included in the plurality of Msg2 are different, the UE selects one UL TA to send one or more Msg3s. If the UL grant and the temporary C-RNTI included in the multiple Msg2 are different, the UE selects one or more sets of UL grants and the temporary C-RNTI to send one or more Msg3s.

Further, the UE receives multiple Msg2s sent by multiple TRPs in the same subframe. If the UL grant and the temporary C-RNTI are different, the UE transmits the different temporary C-RNTIs on different uplink resources in the same subframe. Msg3.

Step 1407: One or more TRPs send measurement information of Msg3 and receiving Msg3 to the CU.

Since the Msg3 includes the UE identification information or the C-RNTI of the UE, the CU needs to perform processing. Therefore, one or more TRPs send the Msg3 to the CU, and report the measurement information of the received Msg3, including the received signal strength and signal quality.

Step 1408: The CU identifies the UE by using the UE identity information or the C-RNTI of the UE, performs a contention resolution decision, and performs coordinated Msg4 transmission.

The sending Msg4 is similar to the sending Msg2, that is, selecting the best TRP to send Msg4 or multiple TRPs satisfying the condition to send the same Msg4.

Specifically, if the UEs indicated in the Msg3 sent by the one or more TRPs are the same, the CU performs a contention resolution decision and performs coordinated Msg4 transmission, where the Msg4 includes the contention resolution information of the UE; if one or more TRPs The UE indicated in the sent Msg3 is different, then the CU performs a contention resolution decision and performs coordinated Msg4 transmission, and different Msg4 includes contention resolution information of different UEs.

Step 1409: The TRP sends the Msg4 including the contention resolution information to the terminal according to the indication of the CU.

Step 1410: After receiving the Msg4 including the contention resolution information, the UE considers that the contention resolution is successful.

If the UE does not receive the Msg4 after the contention timer expires, and considers that the contention resolution fails, the time of the next random access is determined according to the backoff delay parameter, and the random access resource is selected to initiate the next random access.

The scheme of the present invention will be described in detail below by way of a few examples.

Embodiment 1 As shown in FIG. 15, a schematic diagram of random access under ideal pre-transmission/back-transmission in a multi-TRP cell according to an embodiment of the present invention.

Take the non-contention random access process in UE1 handover as an example. The specific process is as follows:

Step 1: UE1 performs handover between multiple TRP cells under CU management.

For example, UE1 switches from the source cell (TRP2 cell Cell2) to the target cell (TRP3 cell Cell3 and/or TRP4 cell Cell4). When the CU switches, it will actively request UE1 to initiate a non-contention random access procedure.

Step 2: The CU instructs TRP2 to send non-contention specific random access information through a proprietary signal.

For example, the Msg0 is sent by using the RRC connection reconfiguration message, and the Msg0 includes the Preamble code and the PRACH channel resource used by the UE1 to initiate non-contention random access, and the specific random access information is tied with the identifier of the UE1 (for example, the C-RNTI of the UE1). Or mapping.

Step 3: UE1 acquires non-contention specific random access information sent by TRP2, and sends Msg1.

Since the specific random access information corresponding to Msg1 is bound or mapped with the identifier of UE1, no contention resolution is required.

Step 4: TRP3 and TRP4 adjacent to UE1 receive Msg1 sent by UE1.

Since the TRP and the CU are ideal forward/backhaul, the TRP3 and the TRP4 send the Msg1 to the CU, and report the measurement information of the received Msg1, including the received signal strength (for example, received power RP, received power), and signal quality (for example, SINR). ).

The CU determines that the TRP3 and the TRP4 have received the Msg1 of the same UE by using the same Preamble code and the PRACH time-frequency resource in the two Msg1s, and the binding or mapping relationship between the specific random access information corresponding to the Msg1 and the identifier of the UE1 is performed. It is identified as UE1.

The CU performs coordination processing, and selects the TRP with the highest received signal strength or the TRP with the best signal quality Msg2 according to the measurement information of the received Msg1. For example, the received power of the TRP4 is greater than the received power of the TRP3, and the CU selects the TRP4 to send the Msg2.

The TRP4 receives an indication that the CU sends Msg2 and sends Msg2 in the random access response window. Msg2 includes a backoff parameter, a Preamble code corresponding to Msg1, an uplink transmission timing advance (UL TA), an uplink resource (UL grant), and a temporary C-RNTI. TRP4 uses the PDCCH to schedule Msg2 and address it through the RA-RNTI.

Step 5: UE1 successfully receives an Msg2 in the random response window to complete the non-contention random access procedure.

Embodiment 2: As shown in FIG. 16, a schematic diagram of random access under non-ideal forward/backhaul of a multi-TRP cell according to an embodiment of the present invention.

Take the competitive random access procedure in UE2 connection reestablishment as an example. The specific process is as follows:

Step 1: The CU configures the same specific random access information for the TRP1 cell to the TRP4 cell under management, including the Preamble code, the Root sequence, the Preamble transmission power, the PRACH time-frequency resource, the random access response window, the conflict resolution timer, and the like. .

Step 2: TRP1~TRP4 synchronously send the same specific random access information in the system information for competing random access.

Step 3: The radio link failure (RLF) occurs in UE2, and a connection reestablishment process is initiated.

UE2 acquires the same specific random access information transmitted by multiple TRPs (for example, TRP2, TRP3, and TRP4), and transmits Msg1.

That is, UE2 randomly selects a certain Preamble code (for example, Preamble1) indicated in the specific random access information, and a certain PRACH time-frequency resource (for example, PRACH1), and then transmits Preamble1 on PRACH1.

Since the three TRPs are synchronously transmitted, the UE2 receives a superposition of a plurality of synchronization signals, which facilitates the UE 2 to accurately receive specific random access information.

Step 4: The TRP2, TRP3, and TRP4 adjacent to the UE2 receive the Msg1 sent by the UE2.

Since the TRP and the CU are non-ideal forward/backhaul (the delay is not ideal), in order to reduce the access delay, the three TRPs do not perform CU coordination to send the Msg2.

The CU allocates different uplink resources and temporary C-RNTIs to the TRP1 cell to TRP4 cells that send the same specific random access information in advance, so as to ensure no collision.

The three TRPs determine whether the condition is met according to the measurement information of the receiving Msg1, for example, whether the received signal strength and the signal quality satisfy the preset threshold, and the TRP that satisfies the condition recovers Msg2. The receiving power of TRP3 and TRP4 is greater than the preset threshold (configured by the CU), and the receiving power of the TRP2 is less than the preset threshold. Therefore, each of the TRP3 and the TRP4 generates Msg2 with different contents, and sends the Msg2 in the random access response window. The uplink resource and the temporary C-RNTI included in Msg2 are different, the backoff parameters are different, and the UL TA is the same (UE2 is close to TRP3 and TRP4), and the Preamble code corresponding to Msg1 is the same, and the RA-RNTI used for addressing is the same.

Since there is no CU coordination, TRP3 and TRP4 use the different PDCCH resources to schedule Msg2 at the same time.

Step 5: UE2 successfully receives 2 Msg2s in the random response window.

Step 6: Since UE2 receives two Msg2s sent by two TRPs in the same subframe, where the UL grant is different from the temporary C-RNTI, UE2 is sent by different temporary C-RNTIs on different uplink resources of the same subframe. The scrambled Msg3, Msg3 contains the identification information of UE2 (for example, ReestabUE-Identity1).

Step 7: Since the Msg3 includes the identification information of the UE2, the CU needs to process the data. Therefore, the TRP3 and the TRP4 send the two Msg3s to the CU, and report the measurement information of the received Msg3, including the received signal strength and signal quality.

The CU identifies the UE2 by using the identification information of the UE2, and determines that the UEs indicated in the Msg3 sent by the two TRPs are the same, thereby performing a contention resolution decision, and selecting the TRP4 with the largest RP to send the Msg4.

The TRP4 receives the indication that the CU sends the Msg4, and sends the Msg4 before the conflict resolution timer expires. The Msg4 includes the UE2's contention resolution information.

Step 8: UE2 receives Msg4 before the collision resolution timer expires, which includes the contention resolution information of UE2, and UE2 considers that the contention resolution is successful, and completes the contention random access procedure.

Embodiment 3: As shown in FIG. 17, a schematic diagram of random access of an ideal preamble/backhaul of a virtual cell according to an embodiment of the present invention.

Take the simplified random access process in the arrival of UE3 uplink/downlink data as an example. The specific work flow is as follows:

Step 1: The virtual cell under the CU management includes TRP1~TRP4, and the CU is configured with the same specific random access information for the four TRPs, including the Preamble code, the Root sequence, the Preamble transmit power, the PRACH time-frequency resource, and the random access response window. Conflict resolution timers, etc.

Step 2: TRP1~TRP4 synchronously send the same specific random access information in the system information for competing random access.

Step 3: UE3 is an inactive state UE in a connected mode. When the UE3 has uplink/downlink data, the simplified random access procedure is initiated, that is, the Msg1 includes the UE identifier, and the 4-step random access procedure can be simplified to 2 steps (only Msg1 and Msg2 are needed).

The UE3 obtains the same specific random access information sent by multiple TRPs (for example, TRP2, TRP3, and TRP4), and sends Msg1, that is, the UE3 randomly selects a certain Preamble code (such as Preamble2) indicated in the specific random access information, and some After the PRACH time-frequency resource (for example, PRACH2), Preamble2 is transmitted on PRACH2.

Since the three TRPs are synchronously transmitted, the UE3 receives a superposition of a plurality of synchronization signals, which facilitates the UE 3 to accurately receive specific random access information. In order to reduce the access delay time and simplify the random access process, the Msg1 of the UE3 includes the identification information of the UE3 (for example, the C-RNTI of the UE3).

Step 4: TRP2, TRP3, and TRP4 adjacent to UE3 receive Msg1 sent by UE3.

Since TRP, TRP3, and TRP4 send Msg1 to the CU, and report the received Msg1 measurement information, including received signal strength (such as received power RP, received power) and signal quality ( For example SINR).

The CU identifies the UE3 by using the identification information of the UE3, and determines that the UEs indicated in the Msg1 sent by the three TRPs are the same.

The CU performs coordination processing, and selects multiple TRPs whose received signal strength or signal quality meets the preset threshold to reply to the same Msg2 according to the measurement information of the received Msg1, for example, the SINR of TRP3 and TRP4 is greater than a preset threshold (CU configured), and The SINR of TRP2 is less than the preset threshold. Therefore, the CU selects TRP3 and TRP4 to send the same Msg2 for reliability transmission.

TRP3 and TRP4 receive the indication that the CU sends Msg2, and send the same Msg2 in the random access response window, which is a multi-point transmit diversity transmission. Specifically, TRP3 and TRP4 use the PDCCH to schedule Msg2 at the same time, and address by C-RNTI. The two TRPs schedule Msg2 on the same PDCCH resource (for example, CCE), and the content of the scheduled Msg2 is the same, that is, Msg2. The included parameters are the same. Or TRP4 uses the PDCCH to schedule Msg2, and TRP3 and TRP4 send Msg2 of the same content on the same time-frequency resource at the same time. Msg2 includes a backoff parameter, a Preamble code corresponding to Msg1, an uplink transmission timing advance (UL TA), and an uplink resource (UL grant).

Step 5: UE3 successfully receives an Msg2 in the random response window.

Since TRP3 and TRP4 schedule Msg2 with C-RNTI scrambled PDCCH, UE3 completes the simplified random access procedure when receiving the scheduling command.

Embodiment 4: As shown in FIG. 18, the virtual cell of the embodiment of the present invention is non-ideal forward / Back to the random access schematic.

Take the competitive random access process in the initial access of UE4 and UE5 as an example. The specific workflow is as follows:

Step 1: The virtual cell under the CU management includes TRP1~TRP4, and the CU is configured with the same specific random access information for the four TRPs, including the Preamble code, the Root sequence, the Preamble transmit power, the PRACH time-frequency resource, and the random access response window. Conflict resolution timers, etc.

Step 2: TRP1~TRP4 synchronously send the same specific random access information in the system information for competing random access.

Step 3: The UE4 and the UE5 initially access and initiate a contention random access procedure. UE4 and UE5 acquire the same specific random access information sent by multiple TRPs (for example, TRP2, TRP3, and TRP4), and send Msg1.

That is, UE4 and UE5 randomly select a certain Preamble code indicated in the specific random access information (for example, UE4 and UE5 select Preamble3), a certain PRACH time-frequency resource (for example, UE4 selects PRACH3, UE5 selects PRACH4), and UE4 is on PRACH3. The Preamble 3 is transmitted, and the UE 5 transmits the Preamble 3 on the PRACH 4.

Since the three TRPs are synchronously transmitted, the UE4 and the UE5 receive a superposition of a plurality of synchronization signals, which facilitates the UE 4 and the UE 5 to accurately receive specific random access information.

Step 4: The TRP2 and the TRP3 that are adjacent to the UE4 receive the Msg1 sent by the UE4, and the TRP3 and the TRP4 that are adjacent to the UE5 receive the Msg1 sent by the UE5.

Since the TRP and the CU are non-ideal forward/backhaul (the delay is not ideal), in order to reduce the access delay, the three TRPs do not perform CU coordination to send the Msg2.

The CU pre-sends the TRP1 of the same specific random access information in the virtual cell. ~TRP4 allocates different uplink resources, temporary C-RNTI, and guarantees no conflict.

The three TRPs determine whether the condition is met according to the measurement information of the receiving Msg1, for example, whether the received signal strength and the signal quality satisfy the preset threshold, and the TRP that satisfies the condition recovers Msg2. The RP of the TRP2 and the TRP3 is greater than the preset threshold (the CU is configured). Therefore, the TRP2 and the TRP3 respectively generate the Msg2 with different contents, and send the Msg2 in the random access response window, and the uplink resource included in the Msg2 and the temporary C- The RNTI is different, the backoff parameters are different, the UL TA is the same (UE4 is close to TRP2 and TRP3), and the Preamble code corresponding to Msg1 is the same (for example, Preamble3), and the RA-RNTI used for addressing is the same (for example, RA-RNTI1, RA- RNTI1 is determined by PRACH3).

Similarly, the RP of TRP3 and TRP4 is greater than the preset threshold (configured by CU). Therefore, TRP3 and TRP4 each generate Msg2 with different contents, and send Msg2 in the random access response window, and the uplink resource and temporary C included in Msg2. - The RNTI is different, the backoff parameters are different, the UL TA is the same (UE5 is close to TRP3 and TRP4), and the Preamble code corresponding to Msg1 is the same (for example, Preamble3), and the RA-RNTI for addressing is the same (for example, RA-RNTI2, RA) - RNTI2 is determined by PRACH4).

Since there is no CU coordination, TRP2 and TRP3 use different PDCCH resources to schedule Msg2 at different times, and TRP3 and TRP4 use different PDCCH resources to schedule Msg2 at the same time.

Step 5: UE4 successfully receives two Msg2s in the random response window, and UE5 successfully receives two Msg2s in the random response window.

Step 6: Because UE4 receives 2 Msg2s sent by 2 TRPs in different subframes.

The UL grant is different from the temporary C-RNTI. The UE4 selects one Msg2 received first (for example, Msg2 sent by TRP2), and sends one Msg3 and Msg3 in the uplink resource. Contains identification information of UE4 (for example, InitialUE-Identity1).

Since the UE 5 receives two Msg2s sent by two TRPs in the same subframe, in which the UL grant and the temporary C-RNTI are different, the UE 5 transmits the Msg3 scrambled by different temporary C-RNTIs on different uplink resources of the same subframe. Msg3 includes the identification information of UE5 (for example, InitialUE-Identity2).

Step 7: Since the Msg3 includes the identification information of the UE4, the CU needs to perform processing, so the TRP2 sends the Msg3 to the CU.

The CU identifies the UE4 through the identification information of the UE4, performs a contention resolution decision, and selects the TRP2 to send the Msg4.

Similarly, since Msg3 includes the identification information of UE5 and needs to be processed by the CU, TRP3 and TRP4 send two Msg3s to the CU, and report the measurement information of the received Msg3, including the received signal strength and signal quality.

The CU identifies the UE5 by using the identification information of the UE5, and determines that the UEs indicated in the Msg3 sent by the two TRPs are the same, thereby performing a contention resolution decision, and selecting the TRP4 with the largest SINR to send the Msg4.

The TRP2 receives the indication that the CU sends the Msg4, and sends the Msg4 before the conflict resolution timer expires. The Msg4 includes the contention resolution information of the UE4. Similarly, the TRP4 receives the indication that the CU sends the Msg4, and sends the Msg4 before the conflict resolution timer expires. The Msg4 includes the contention resolution information of the UE5.

Step 8: UE4 and UE5 receive Msg4 before the collision resolution timer expires, which includes the contention resolution information of UE4 and UE5, and UE4 and UE5 consider that the contention resolution is successful, and complete the contention random access procedure.

The present application has been described above with reference to block diagrams and/or flowchart illustrations of a method, apparatus (system) and/or computer program product according to embodiments of the present application. It will be understood that a block of the block diagrams and/or flowchart illustrations and combinations of blocks of the block diagrams and/or flowchart illustrations can be implemented by computer program instructions. These computer program instructions may be provided to a general purpose computer, a processor of a special purpose computer, and/or other programmable data processing apparatus to produce a machine for creation of instructions executed by a computer processor and/or other programmable data processing apparatus. A method for implementing the functions/actions specified in the block diagrams and/or flowchart blocks.

Accordingly, the present application can also be implemented with hardware and/or software (including firmware, resident software, microcode, etc.). Furthermore, the application can take the form of a computer program product on a computer usable or computer readable storage medium having computer usable or computer readable code embodied in the medium for use by the instruction execution system or Used in conjunction with the instruction execution system. In the context of the present application, a computer-usable or computer readable medium can be any medium that can contain, store, communicate, transfer, or transfer a program for use by an instruction execution system, apparatus, or device, or in conjunction with an instruction execution system, Used by the device or device.

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

1000-1001‧‧‧Steps

Claims (33)

A method for performing random access, the method comprising: the network side device determining the same specific random access information as the at least one other network side device; the network side device transmitting the specific random access information to the terminal, So that the terminal accesses through the random access information. The method for performing random access according to claim 1, wherein the network side device determines the same random access information as the at least one other network side device, including: the network side device receiving the specific random storage from the control device Take information. The method for performing random access according to claim 1, wherein the network side device sends the specific random access information to the terminal, where the network side device sends the specific random access information by using a broadcast or dedicated signal. Give the terminal. The method for performing random access according to claim 2, wherein after the network side device sends the specific random access information to the terminal, the method further includes: receiving, by the network side device, the random access information sent by the terminal The first message of the preamble (Preamhle) code; the network side device sends a second message including random access response information in the random access response window. The method for performing random access according to claim 4, wherein the network side device receives the first message sent by the terminal and includes the preamble in the random access information, and then sends the content in the random access response window. Before the second message of random access response information, it also includes: The network side device reports the first message to the control device, and determines to receive the first sending indication of the control device. The method for performing random access according to claim 5, wherein the control device notifies the first sending indication to the at least one network side device; the network side device random access response window sends the random access response Before the second message of the information, the network side device and the other network side device receiving the first sending indication use the physical downlink control channel (PDCCH) to schedule the second message at the same time, and the random access is performed. a radio network temporary identifier (RA-RNTI) is addressed; the network side device random access response window sends a second message including random access response information, including: the network side device and the first sending indication The other network side device sends a second message that includes the same random access response information, or the control device notifies the first sending indication to the at least one network side device; the network side device random access response window sends the random message The second message of the access response information includes: the network side device and the other network side device receiving the first sending indication pass at the same time The time-frequency resource comprises transmitting a second random access response message with the same information. The method for performing random access according to claim 4, wherein the network side device sends the second message including the random access response information in the random access response window, including: The network side device sends a second message including the random access response information in the random access response window according to the uplink resource and the temporary cell radio network temporary identifier (C-RNTI) configured by the control device. The method for performing random access according to claim 7, wherein before the network side device sends the second message including the random access response information in the random access response window, the method further includes: the network side device according to the receiving The measurement information of a message determines that the transmission condition is satisfied. The method of any one of the preceding claims, wherein, after the network side device sends the second message including the random access response information in the random access response window, the method further includes: the network side device receives Receiving, by the terminal, the third message including the competition information and the measurement information for receiving the third message, to the control device; after receiving the second sending indication of the control device, the network side device sends the contention to the terminal The fourth message to solve the information. A method for performing random access, the method comprising: controlling a device to determine specific random access information; and the control device transmitting the specific random access information to at least two network side devices, so that the at least two The network side device sends the specific random access information to the terminal, and the terminal accesses the random access information. The method for performing random access according to claim 10, wherein, after the control device sends the specific random access information to the at least two network side devices, the method further includes: the control device receiving the at least two network side devices Transmitting, by the same terminal, a first message that includes a preamble in the random access information; the control device selects at least one network side device from the at least two network side devices, And notifying, by the first sending indication, the selected network side device, so that the network side device sends a second message including random access response information to the terminal; the control device selects at least one of the at least two network side devices The network side device includes: the control device selects at least one network side device from the at least two network side devices according to the measurement information that each network side device receives the first message. The method for performing random access according to claim 10, wherein the method further comprises: the control device assigning different uplink resources and a temporary cell radio network temporary identifier (C-RNTI) to the at least two network side devices. After the network side device receives the first message that is sent by the terminal and includes the preamble in the random access information, and sends the random access in the random access response window by using the uplink resource and the temporary C-RNTI. Take the second message in response to the message. The method for performing random access according to any one of claims 10 to 12, wherein after the control device sends the specific random access information to the at least two network side devices, the method further includes: the control device receiving at least And transmitting, by the two network side devices, the third message that includes the contention information sent by the same terminal, and the measurement information that the at least two network side devices receive the third message, to the control device, where the control device is configured according to each network. The roadside device receives the measurement information of the third message, selects at least one network side device from the at least two network side devices, and notifies the selected network side device to the second sending indication, so that the network side device sends the contention to the terminal. The fourth message to solve the information. A method for performing random access, comprising: receiving, by a terminal, the same specific random access information sent by at least two network side devices; and performing, by the terminal, random access according to the specific random access information. The method for performing random access according to claim 14, wherein the terminal performs random access according to the specific random access information, including: the terminal passes the time-frequency resource in the specific random access information to at least two Some or all of the network side devices of the network side device send a first message including a preamble in the specific random access information; the terminal receives at least one second message that is sent by the network side device and includes the same random access response information. Message. The method for performing random access according to claim 15, wherein the terminal places the preamble bound to the terminal in the specific random access information in the first message. The method of performing random access as described in claim 16, wherein the terminal places the terminal identifier in the first message. The method for performing random access according to claim 16, wherein after the terminal receives the second message that is sent by the network side device and includes the same random access response information, the method further includes: sending, by the terminal, the second The at least one network side device of the message sends a third message including the contention information; the terminal receives the fourth message that is sent by the at least one network side device and includes the contention resolution information. A method for performing random access as described in claim 18, wherein the terminal receives a plurality of seconds Transmitting, by the terminal, the third message including the contention information to the at least one network side device that sends the second message, including: if the uplink timing advance (UL TA) in the plurality of second messages is different, the terminal Selecting at least one UL TA and transmitting a third message including contention information according to the selected UL TA; or if an uplink grant (UL grant) and a temporary cell radio network temporary identifier (C) in the plurality of second messages -RNTI) is different, the terminal selects at least one set of UL grants and temporary C-RNTIs, and sends a third message containing contention information according to the selected UL grant and the temporary C-RNTI. The method for performing random access according to claim 19, wherein the terminal sends a third message including contention information according to the selected UL grant and the temporary C-RNTI, including: when the terminal needs to send multiple third messages, And sending, according to the selected UL grant, the third message scrambled by using different temporary C-RNTIs on different uplink resources of the same subframe. The method for performing random access according to any one of claims 14 to 20, wherein the specific random access information includes but is not limited to part or all of the following information: a preamble, a root sequence, Preamble transmission power, PRACH time-frequency resources, random access response window, collision resolution timer. A network side device for performing random access, wherein the network side device includes: a first information determining module, configured to determine the same specific random access information as the at least one other network side device; the first processing module Transmitting the specific random access information to the terminal to enable the The terminal accesses through the random access information. The network side device that performs random access according to claim 22, wherein the first processing module is further configured to: after the specific random access information is sent to the terminal, receive the random access that is sent by the terminal a first message of a preamble code in the information; sending a second message including random access response information in the random access response window; and the first processing module is specifically configured to: use the first message Reporting to the control device, and after determining to receive the first sending indication of the control device, sending a second message including random access response information in the random access response window. The network side device that performs random access as described in claim 23, wherein the control device notifies the first sending indication to the at least one network side device; the first processing module is specifically configured to: receive the The other network side device that sends the first indication uses the physical downlink control channel (PDCCH) to schedule the second message at the same time, and is addressed by a random access-radio network temporary identifier (RA-RNTI); The other network side device that sends the indication sends the second message that includes the same random access response information; or the control device notifies the first sending indication to the at least one network side device; the first processing module is specifically used to : passing the same time at the same time as other network side devices receiving the first sending indication The time-frequency resource sends a second message containing the same random access response information. The network side device performing random access as described in claim 23, wherein the first processing module is specifically configured to: an uplink resource and a temporary cell radio network temporary identifier (C-RNTI) configured according to the control device Sending a second message including the random access response information in the random access response window, or the first processing module is further configured to: after determining that the sending condition is met according to the measurement information of the received first message, A second message containing random access response information is sent in the response window. The network side device for random access according to any one of claims 23 to 25, wherein the first processing module is further configured to: send a message including random access response information in a random access response window After the second message, the received third message containing the competition information of the terminal and the measurement information for receiving the third message are sent to the control device; after receiving the second sending indication of the control device, sending the second message to the terminal The fourth message containing the contention resolution information. A control device for performing random access, the control device includes: a second information determining module, configured to determine specific random access information; and a second processing module, configured to send the specific random access information Giving at least two network side devices, so that the at least two network side devices send the specific random access information to the terminal, and the terminal accesses by using the random access information. a control device for performing random access as described in claim 27, wherein the second processing module The method is further configured to: after transmitting the specific random access information to the at least two network side devices, receive, by the at least two network side devices, the first one sent by the same terminal and including the preamble in the random access information Transmitting at least one network side device from the at least two network side devices, and notifying the selected network side device of the first sending indication, so that the network side device sends the random access response information to the terminal And the second processing module is configured to select at least one network side device from the at least two network side devices according to the measurement information that each network side device receives the first message. The control device for performing random access according to claim 27, wherein the second processing module is further configured to: allocate different uplink resources and temporary cell radio network temporary identifiers to the at least two network side devices ( C-RNTI), after the network side device receives the first message including the preamble in the random access information sent by the terminal, and sends the uplink resource and the temporary C-RNTI in the random access response window. A second message containing random access response information. The control device for random access according to any one of claims 27 to 29, wherein the second processing module is further configured to: after the specific random access information is sent to the at least two network side devices, And receiving, by the at least two network side devices, the third message that includes the contention information sent by the same terminal, and the measurement information that the at least two network side devices receive the third message, and sends the measurement information to the control The device is configured to: according to the measurement information of the third message received by each network side device, select at least one network side device from the at least two network side devices, and notify the selected network side device of the second sending indication, so that the network side The device sends a fourth message containing the contention resolution information to the terminal. A terminal for performing random access, the terminal includes: a receiving module, configured to receive the same specific random access information sent by at least two network side devices; and an access module, configured to use the specific random Access information for random access. The terminal for performing random access as described in claim 31, wherein the access module is specifically configured to: pass part or all of at least two network side devices by using time-frequency resources in the specific random access information The network side device sends a first message that includes the preamble in the specific random access information; and receives at least one second message that is sent by the network side device and includes the same random access response information; the access module is further configured to: The preamble bound to the terminal in the specific random access information is placed in the first message; and the access module is further configured to: place the terminal identifier in the first message. The terminal for performing random access according to claim 32, wherein the access module is further configured to: receive, by the at least one network side device, the same random access response information After the second message, the third message including the contention information is sent to the at least one network side device that sends the second message; the fourth message that is sent by the at least one network side device and includes the contention resolution information is received; and the receiving module receives And the access module is configured to: if the uplink timing of the plurality of second messages is advanced (the UL TA is different), the terminal selects at least one UL TA, and according to the selected UL The TA sends a third message containing the contention information; or if the uplink grant (UL grant) and the temporary cell radio network temporary identifier (C-RNTI) in the plurality of second messages are different, the terminal selects at least one Generating a UL grant and a temporary C-RNTI, and sending a third message including the contention information according to the selected UL grant and the temporary C-RNTI; and the access module is specifically configured to: when multiple third messages need to be sent, The third message scrambled by different temporary C-RNTIs is sent on different uplink resources of the same subframe according to the selected UL grant.