WO2024169144A1

WO2024169144A1 - Random access method and apparatus

Info

Publication number: WO2024169144A1
Application number: PCT/CN2023/112631
Authority: WO
Inventors: 贾美艺; 李国荣; 张磊
Original assignee: 富士通株式会社; 贾美艺; 李国荣; 张磊
Priority date: 2023-02-14
Filing date: 2023-08-11
Publication date: 2024-08-22
Also published as: WO2024168549A1

Abstract

A random access method and apparatus. The method comprises: when a random access process triggered by a first PDCCH command is presently proceeding, a terminal device receiving a second PDCCH command, the second PDCCH command comprising the same random access preamble, PRACH mask index, and uplink carrier as are indicated by the first PDCCH command; and when first information related to the first PDCCH command is the same as second information related to the second PDCCH command, the terminal device considering the random access process corresponding to the second PDCCH command and the random access process triggered by the first PDCCH command to be the same random access process; and the first information and the second information comprising at least one of TRP information, cell information, and random access opportunity information.

Description

Random access method and device

Technical Field

The present application relates to the field of communications.

Background Art

There are two types of random access procedures: 4-step random access (4-step RA) using MSG1 and 2-step random access (2-step RA) using MSGA. Both types of random access procedures support contention-based random access (CBRA, Contention Based Random Access) and non-contention random access (CFRA, Contention Free Random Access).

FIG. 1 is a schematic diagram of information exchange between 4-step random access and 2-step random access.

The 4-step RA type MSG1 includes a preamble on the PRACH (Physical Random Access Channel). After the MSG1 is transmitted, the UE listens for a response from the network within a configured window.

For CFRA, the network allocates a dedicated preamble for MSG1 transmission, and once a random access response is received from the network, the UE ends the random access procedure (as shown in (c) in Figure 1);

For CBRA, when receiving a random access response, the UE sends MSG3 using the UL grant scheduled in the response and monitors contention resolution (as shown in (a) in Figure 1); if contention resolution is unsuccessful after MSG3 transmission/retransmission, the UE returns to MSG1 transmission.

The 2-step RA type MSGA includes a preamble on PRACH and a data (payload) on PUSCH. After the MSGA is transmitted, the UE listens for a response from the network within a configured window;

For CFRA, dedicated preamble and PUSCH resources for MSGA transmission are configured, and once a network response is received, the UE ends the random access procedure (as shown in (d) in Figure 1);

For CBFA, if the contention resolution is successful when receiving the network response, the UE ends the random access process (as shown in (b) in FIG. 1 ).

When carrier aggregation (CA) is configured, for 2-step RA type random access, random access is performed only on the primary cell (PCell), and contention resolution can be cross-scheduled by the PCell.

When CA is configured, for a 4-step RA type random access procedure, the first 3 steps of CBRA always send Occurs in PCell, contention resolution can be cross-scheduled by PCell. The 3 steps of CFRA starting on PCell are all on PCell. CFRA on secondary cell (SCell) is initiated only by gNB to establish the timing advance of secondary TAG: This process is initiated by gNB with a PDCCH order (PDCCH order) (step 0) sent on a scheduling cell (scheduling cell) of an activated SCell of this secondary TAG, preamble transmission (step 1) occurs on this indicated SCell, and random access response (step 2) occurs on PCell.

When a terminal device moves from the coverage area of one cell to the coverage area of another, at some point a serving cell change needs to be performed. Currently, serving cell changes are triggered by Layer 3 (L3) measurements and done by RRC signalling, with the addition of Reconfiguration with Synchronisation triggered for PCell and Primary Secondary Cell (PSCell) changes, and the release of SCells when applicable. All cases involve a full Layer 1, i.e. L1 (and Layer 2, i.e. L2) reset, resulting in longer latency, greater overhead and longer disruption times than beam switching mobility. The goal of L1/L2 mobility enhancements is to ensure that serving cell changes via L1/L2 signalling reduce latency, overhead and disruption times.

To reduce mobility delay, the L1/L2-based inter-cell mobility mechanisms and processes include:

Configuration and maintenance of multiple candidate cells to allow rapid application of candidate cell configurations;

For scenarios that may be applicable, a dynamic switching mechanism between candidate serving cells (including special cells and secondary cells) based on L1/L2 signaling;

L1 enhancements for inter-cell beam management, including L1 measurement and reporting, and beam indication;

Timed advance management;

CU-DU interface signaling to support L1/L2 mobility.

It should be noted that the above introduction to the technical background is only for convenience, to provide a clear and complete description of the technical solutions of the present application and to facilitate the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present application.

Summary of the invention

Timing Advance Management is part of the mechanisms and procedures to achieve L1/L2 inter-cell mobility. It has been agreed to support the acquisition of the timing advance (TA) of the candidate cell before receiving the cell switch command during the L1/L2 triggered mobility (LTM) process. One mechanism to obtain the TA of the candidate cell is PDCCH ordered RACH. The TA update of the candidate cell, i.e. the re-acquisition of the TA, can be triggered by the network, reusing the same triggering mechanism for the initial TA acquisition, i.e. the candidate cell. Random access triggered by PDCCH ordered on the UDP packet.

PDCCH ordered RACH obtains the TA of the LTM candidate cell. Among them, PDCCH order is only triggered by the source cell. Its DCI introduces the indication of the candidate cell and/or the PRACH occasion of the candidate cell. The RACH resource configuration of the candidate cell is provided before PDCCH order.

When a random access procedure is initiated on a serving cell, the MAC entity will: (1) clear the Msg3 and MSGA buffers and initialize related (type-independent) variables; (2) select the carrier on which the random access procedure is to be performed; (3) perform BWP (BandWidth Part) operation; (4) select a random access resource group applicable to the current random access procedure; and (5) set the random access type and perform initialization of random access type-specific variables.

If there is an ongoing random access procedure triggered by a PDCCH order and the UE receives another PDCCH order indicating the same random access preamble, PRACH mask index and uplink carrier, the random access procedure is regarded as the same random access procedure as the ongoing one and is not initiated again.

Regarding Random Access Response (RAR) reception:

For 4-step RA RAR reception, the current random access process includes the following two possibilities:

1. There is no RAR, such as random access initiated for SI (System Information) request or beam failure recovery;

2. Monitor the PDCCH of the special cell to receive the RAR identified by the RA-RNTI.

The RA-RNTI associated with the PRACH occasion that sends the RA preamble is calculated as follows:
RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id

Where, s_id (0≤s_id<14) is the index of the first OFDM symbol of the PRACH occasion, t_id (0≤t_id<80) is the index of the first slot of the PRACH occasion in a system frame or the index of the 120kHz slot in a system frame including the PRACH occasion, f_id (0≤f_id<8) is the index of the PRACH occasion in the frequency domain, ul_carrier_id is the UL carrier used for Random Access Preamble transmission (0 is NUL carrier, 1 is SUL carrier).

For 2-step RA RAR reception, the current random access process includes the following two possibilities:

1. Monitor the PDCCH of the special cell to receive the RAR identified by the MSGB-RNTI;

2. Monitor the PDCCH of the special cell to receive the RAR identified by the C-RNTI.

The MSGB-RNTI calculation formula associated with the PRACH occasion sending the RA preamble is as follows:
MSGB-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×
ul_carrier_id+14×80×8×2

The inventors have found that the random access process on the candidate cell has the following problems:

1) According to the existing mechanism, the PDCCH ordered RACH random access procedures of different candidate cells triggered by the source cell may be regarded as the same random access procedure and thus skipped, thus affecting the TA acquisition of the candidate cell;

2) According to the existing mechanism, since the same PRACH occasion and RA preamble may be allocated to different terminals, the terminal cannot determine whether the received RAR is its own, or since different candidate cells may be allocated the same PRACH occasion and RA preamble, the terminal cannot determine which candidate cell the received RAR belongs to, and thus cannot confirm the TA of the candidate cell.

In order to solve one or more of the above problems, an embodiment of the present application provides a random access method and device.

According to a first aspect of an embodiment of the present application, a random access apparatus is provided, wherein the apparatus is arranged in a terminal device, and the apparatus comprises: a first determining unit, which is used for, when a random access process triggered by a first PDCCH order (PDCCH order) is in progress, the terminal device receives a second PDCCH command, the second PDCCH command comprises the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and when the first information related to the first PDCCH command is the same as the second information related to the second PDCCH command, the random access process corresponding to the second PDCCH command is considered to be the same random access process as the random access process triggered by the first PDCCH command, and the first information and the second information comprise at least one of TRP information, cell information and random access opportunity (RO) information.

According to a second aspect of an embodiment of the present application, a random access device is provided, the device being arranged in a terminal device, the device comprising: a first sending unit, which is used to send a random access preamble code; a first receiving unit, which is used to monitor a PDCCH to receive a random access response (RAR) identified by a RA-RNTI or a MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information, and/or the PDCCH The search space or control resource set associated with the candidate cell.

According to a third aspect of an embodiment of the present application, a random access device is provided, which is arranged in a network device, and the device includes: a second receiving unit, which is used to receive a random access preamble code from a terminal device; and a second sending unit, which is used to send a PDCCH to the terminal device, for scheduling a random access response (RAR) of the terminal device identified by a RA-RNTI or a MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information, and/or the PDCCH is associated with a search space or a control resource set related to a candidate cell.

According to a fourth aspect of an embodiment of the present application, a terminal device is provided, wherein the terminal device includes the apparatus according to the first aspect of an embodiment of the present application.

According to a fifth aspect of an embodiment of the present application, a terminal device is provided, wherein the terminal device includes the apparatus according to the second aspect of an embodiment of the present application.

According to a sixth aspect of an embodiment of the present application, a network device is provided, wherein the network device includes the apparatus described in the third aspect of an embodiment of the present application.

According to a seventh aspect of an embodiment of the present application, a communication system is provided, wherein the communication system includes a network device and the terminal device described in the fourth aspect of the embodiment of the present application.

According to an eighth aspect of an embodiment of the present application, a communication system is provided, wherein the communication system includes the terminal device described in the fifth aspect and/or the network device described in the sixth aspect of the embodiment of the present application.

According to a ninth aspect of an embodiment of the present application, a random access method is provided, the method comprising: when a random access process triggered by a first PDCCH order (PDCCH order) is in progress, a terminal device receives a second PDCCH command, the second PDCCH command comprising the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first information related to the first PDCCH command is the same as the second information related to the second PDCCH command, the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command, the first information and the second information comprising at least one of TRP information, cell information and random access opportunity (RO) information.

According to a tenth aspect of an embodiment of the present application, a random access method is provided, the method comprising: a terminal device sends a random access preamble; the terminal device monitors a PDCCH to receive a random access response (RAR) identified by a RA-RNTI or a MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information, and/or the PDCCH is associated with a search space or control resource related to a candidate cell. Source collection.

According to the eleventh aspect of an embodiment of the present application, a random access method is provided, the method comprising: a network device receives a random access preamble code from a terminal device; and the network device sends a PDCCH to the terminal device for scheduling a random access response (RAR) identified by an RA-RNTI or an MSGB-RNTI of the terminal device, wherein the RA-RNTI or the MSGB-RNTI is calculated at least based on cell information, and/or the PDCCH is associated with a search space or a control resource set related to a candidate cell.

According to the twelfth aspect of the embodiments of the present application, a computer-readable program is provided, wherein when the program is executed in a random access device or a terminal device, the program causes the random access device or the terminal device to perform the random access method described in the ninth aspect or the tenth aspect of the embodiments of the present application.

According to the thirteenth aspect of the embodiment of the present application, a computer-readable program is provided, wherein when the program is executed in a random access device or a network device, the program enables the random access device or terminal device to execute the random access method described in the eleventh aspect of the embodiment of the present application.

According to the fourteenth aspect of the embodiments of the present application, a storage medium storing a computer-readable program is provided, wherein the computer-readable program enables a random access device or a terminal device to execute the random access method described in the ninth aspect or the tenth aspect of the embodiments of the present application.

According to the fifteenth aspect of the embodiments of the present application, a storage medium storing a computer-readable program is provided, wherein the computer-readable program enables a random access device or a network device to execute the random access method described in the eleventh aspect of the embodiments of the present application.

One of the beneficial effects of the embodiments of the present application is:

While the random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, and the second PDCCH command includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first information related to the first PDCCH command is the same as the second information related to the second PDCCH command, the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command. In this way, when the first information is different from the second information, the terminal device can trigger a new random access process based on the second PDCCH command, thereby obtaining the TA value of the candidate cell.

Alternatively, the terminal device monitors the PDCCH to receive a random access response (RAR) identified by a RA-RNTI or MSGB-RNTI, wherein the RA-RNTI or MSGB-RNTI is calculated based on at least the cell information, and/or the PDCCH is associated with a search space or control resource set associated with the candidate cell, so that the terminal device can determine Whether the received RAR is its own, and determine to which candidate cell the received RAR belongs, so as to confirm the TA of the candidate cell.

With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the spirit and clauses of the appended claims, the embodiments of the present application include many changes, modifications and equivalents.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

It should be emphasized that the terms “include/comprises/has” when used herein refer to the presence of features, integers, steps or components, but do not exclude the presence or addition of one or more other features, integers, steps or components.

BRIEF DESCRIPTION OF THE DRAWINGS

The elements and features described in one figure or one implementation of the present application embodiment may be combined with the elements and features shown in one or more other figures or implementations. In addition, in the accompanying drawings, similar reference numerals represent corresponding parts in several figures and can be used to indicate corresponding parts used in more than one implementation.

The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

FIG1 is a schematic diagram of information exchange between 4-step random access and 2-step random access;

FIG2 is a schematic diagram of a communication system according to an embodiment of the present application;

FIG3 is a schematic diagram of a deployment scenario of Repeater/RIS;

FIG4 is a schematic diagram of a scenario of multiple TRP operations;

FIG5 is a schematic diagram of an inter-cell mobility scenario based on L1/L2;

FIG6 is a schematic diagram of the L1/L2 triggered mobility process within the gNB-DU;

FIG7 is a schematic diagram of the L1/L2 triggered mobility process between gNB-DU;

FIG8 is a schematic diagram of a random access method according to Embodiment 1 of the present application;

FIG9 is a schematic diagram of a random access method according to Embodiment 2 of the present application;

FIG10 is a schematic diagram of a random access method according to Embodiment 3 of the present application;

FIG11 is a schematic diagram of a random access device according to Embodiment 4 of the present application;

FIG12 is a schematic diagram of a random access device according to Embodiment 5 of the present application;

FIG13 is a schematic diagram of a random access device according to Embodiment 6 of the present application;

FIG14 is a schematic block diagram of a system structure of a terminal device according to Embodiment 7 of the present application;

Figure 15 is a schematic block diagram of the system structure of the network device of Example 8 of the present application.

DETAILED DESCRIPTION

With reference to the accompanying drawings, the above and other features of the present application will become apparent through the following description. In the description and the accompanying drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the attached claims.

In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements from the title, but do not indicate the spatial arrangement or time order of these elements, etc., and these elements should not be limited by these terms. The term "and/or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. refer to the existence of the stated features, elements, components or components, but do not exclude the existence or addition of one or more other features, elements, components or components.

In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms and should be broadly understood as "a kind" or "a type" rather than being limited to the meaning of "one"; in addition, the term "said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "at least in part according to...", and the term "based on" should be understood as "at least in part based on...", unless the context clearly indicates otherwise.

In an embodiment of the present application, the term "communication network" or "wireless communication network" may refer to a network that complies with any of the following communication standards, such as Long Term Evolution (LTE), enhanced Long Term Evolution (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed Packet Access (HSPA), New Radio (NR), etc.

Furthermore, communication between devices in the communication system may be carried out according to communication protocols of any stage, for example, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and future 5G, etc., and/or other communication protocols currently known or to be developed in the future.

In the embodiments of the present application, the term "network device" or "network node" refers to, for example, a device in a communication system that connects a user device to a communication network and provides services for the user device. Network devices or network nodes may include, but are not limited to, the following devices: "node" and/or "donor" under the IAB architecture, base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.

Among them, the base station may include but is not limited to: NodeB (NodeB or NB), evolved NodeB (eNodeB or eNB) and 5G base station (gNB), etc., and may also include remote radio head (RRH, Remote Radio Head), remote radio unit (RRU, Remote Radio Unit), relay or low-power node (such as femto, pico, etc.). And the term "base station" may include some or all of their functions. Each base station can provide communication coverage for a specific geographical area. For example, a 5G base station gNB may include a gNB CU and one or more gNB DUs, where CU/DU is a logical node of a gNB with some functions of a gNB. The term "cell" may refer to a base station and/or its coverage area, depending on the context in which the term is used. A gNB-DU supports one or more cells, and a cell is supported by only one gNB-DU.

In the embodiments of the present application, the term "user equipment" (UE) refers to, for example, a device that accesses a communication network through a network device and receives network services, and may also be referred to as "terminal equipment" (TE). The terminal equipment may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, and the like. For example, a terminal device served by an IAB node or an IAB host under the IAB architecture.

Among them, terminal devices may include but are not limited to the following devices: cellular phones, personal digital assistants (PDA, Personal Digital Assistant), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, cordless phones, smart phones, smart watches, digital cameras, etc.

For another example, in scenarios such as the Internet of Things (IoT), the terminal device can also be a machine or device for monitoring or measuring, such as but not limited to: machine type communication (MTC) terminal, vehicle-mounted communication terminal, device to device (D2D) terminal, machine to machine (M2M) terminal, and so on.

In the embodiments of the present application, "when...", "under the circumstances of...", "for the circumstances of..." and "as "Result..." all mean based on one or certain conditions or states, etc. In addition, these expressions can be used interchangeably.

The following describes the scenarios of the embodiments of the present application through examples, but the present application is not limited thereto.

FIG2 is a schematic diagram of a communication system according to an embodiment of the present application, which schematically illustrates a situation in which a terminal device and a network device are used as examples. As shown in FIG2 , a communication system 100 includes a network device 101 and a terminal device 102. For simplicity, FIG2 only illustrates one terminal device as an example, but may also include a situation in which multiple terminal devices are used.

In the embodiment of the present application, existing services or services that can be implemented in the future can be carried out between the network device 101 and the terminal device 102. For example, these services include but are not limited to: enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), etc.

In the current communication system, in order to increase coverage, etc., an additional node, device or entity is added between the base station (such as gNB or gNB-CU or gNB-DU) and the mobile terminal (terminal device), which has a simplified protocol stack and/or function for processing (such as amplifying, routing, etc.) signals and/or symbols received from the base station and/or mobile terminal and transmitting them to the mobile terminal and/or base station.

The additional nodes, devices or entities may be Repeaters, RISs (Reconfigurable Intelligent Surfaces), TRPs (Transmit/Receive Points), etc.

Scenarios in which an additional node, device, or entity is used between a base station and a mobile terminal are all scenarios to which embodiments of the present application are applicable, for example, including:

(1) Repeater/RIS scenario

FIG. 3 is a schematic diagram of a deployment scenario of Repeater/RIS.

As shown in Figure 3, a Repeater/RIS is a device that receives, processes and sends radiated or conducted RF carriers in the downlink direction (from the base station to the mobile terminal) and the uplink direction (from the mobile terminal to the base station).

For a Repeater, the processing includes power amplification; an example of a Repeater is a NCR (Network Controlled Repeater).

For RIS, the processing includes beamforming, reshaping the propagation environment, etc. In the working frequency band where only the downlink or uplink is designated, only the designated uplink or downlink is repeated.

(2) Multi-TRP Operation Scenario

The TRP is the part of the gNB that receives signals from and/or sends signals to the terminal UE.

Figure 4 is a schematic diagram of a scenario of multi-TRP operation. As shown in Figure 4, in multi-TRP operation, a serving cell can schedule UE from 2 TRPs to provide better PDSCH coverage, reliability and/or data rate. For multi-TRP, there are 2 different operation modes, namely single DCI and multi-DCI. For these two modes, within the configuration provided by the RRC layer, the control of uplink and downlink operations is performed by the physical layer and MAC. In single DCI mode, the UE is scheduled by two TRPs through the same DCI; in multi-DCI mode, the UE is scheduled by a separate DCI for each TRP. The embodiments of the present application are applicable to multi-DCI mode.

In this embodiment of the present application, the two TRPs may belong to the same cell or to different cells.

As shown in Figure 4, the gNB where TRP-2 is located is an additional node or device or entity, while the gNB where TRP-1 is located is a base station. TRP-2 and TRP-1 can belong to different gNBs and exchange information through the X2 interface; or, TRP-2 and TRP-1 can be part of the gNB and belong to the same gNB, using an internal interface to exchange information.

FIG. 5 is a schematic diagram of an inter-cell mobility scenario based on L1/L2.

When a terminal device moves from the coverage area of one cell to the coverage area of another cell, at some point it is necessary to perform an L1/L2 triggered serving cell change. The scenarios supported by L1/L2 based inter-cell mobility include:

Inter-DU and intra-DU scenarios: The designs of intra-DU and inter-DU L1/L2-based mobility should share as much commonality as possible under reasonable circumstances;

Handover, i.e. mobility/change of PCell, involves both non-CA (i.e. PCell only) and CA scenarios (i.e. PCell and SCell(s)), which include:

The target PCell/target SCell(s) is not the current serving cell (i.e., CA->CA scenario with PCell change), such as the LTM from terminal B to terminal D in Figure 5;

The target SCell is the current PCell, such as the LTM from terminal A to terminal B in FIG5 ;

The target PCell is a current SCell, such as the LTM from terminal B to C in FIG5 ;

The CA scenario supports PCell changes without SCell changes and PCell changes with SCell changes;

Support NR-DC scenarios, at least for PSCell changes not involving MN, i.e. intra-SN;

Basically, inter-frequency scenarios are supported (including mobility to inter-frequency cells other than the current serving cell), and inter-frequency L1 measurements are supported if feasible.

In the embodiment of the present application, the source and target cells may be synchronous or asynchronous, and may operate in FR1 and FR2.

FIG6 is a schematic diagram of the mobility process triggered by L1/L2 in gNB-DU. As shown in FIG6, when the terminal When moving within the same gNB-DU, NR operations for L1/L2 triggered mobility include:

1. The UE sends a MeasurementReport message including neighbor cell measurements to the gNB-DU. The gNB-DU sends an UL RRC MESSAGE TRANSFER message carrying the received MeasurementReport message to the gNB-CU.

2. The gNB-CU decides to initiate the configuration of L1/L2 inter-cell mobility;

3. Assumption: The gNB-CU sends a UE CONTEXT MODIFICATION REQUEST message to the gNB-DU to include the target candidate cells;

4. Assumption: If the request to configure L1/L2 inter-cell mobility is accepted, the gNB-DU responds with a UE CONTEXT MODIFICATION RESPONSE message including the generated lower layer RRC configuration of the agreed candidate cells;

5. The gNB-CU sends a DL RRC MESSAGE TRANSFER message to the gNB-DU, including a generated RRCReconfiguration message carrying the L1/L2 inter-cell mobility configuration.

6. The gNB-DU passes the received RRCReconfiguration message to the UE;

7. The UE responds to the gNB-DU with an RRCReconfigurationComplete message;

8. The gNB-DU transmits the RRCReconfigurationComplete message to the gNB-CU via the UL RRC MESSAGE TRANSFER message.

9.UE sends L1measurement result to gNB-DU. gNB-DU decides to perform L1/L2 inter-cell mobility.

10. gNB-DU sends L1/L2 inter-cell mobility command to UE;

11.FFS: How the gNB-DU detects that the UE has accessed a cell depends on RAN2;

12. The gNB-DU indicates to the gNB-CU that the UE has successfully accessed the target cell through the Access Success message, including the target cell ID.

13.FFS: gNB-CU can send UE Context Modification message to gNB-DU to release the resources of the prepared cell;

14.FFS:gNB-DU responds to UE CONTEXT MODIFICATION RESPONSE message.

Figure 7 is a schematic diagram of the L1/L2 triggered mobility process between gNB-DUs. As shown in Figure 7, when the terminal moves from one gNB-DU to another gNB-DU in the same gNB-CU, the NR operation process of L1/L2 triggered mobility includes:

1. The UE sends a MeasurementReport message including neighbor cell measurements to the source gNB-DU. Send an UL RRC MESSAGE TRANSFER message carrying the received MeasurementReport message to the gNB-CU;

3. The gNB-CU sends a UE CONTEXT SETUP REQUEST message to the candidate gNB-DU to include the target candidate cell.

4. If the candidate gNB-DU decides to accept the request for LTM configuration, it responds with a UE CONTEXT SETUP RESPONSE message to the gNB-CU including the generated low-layer RRC configuration of the accepted target candidate cell;

5. The gNB-CU sends a DL RRC MESSAGE TRANSFER (or UE CONTEXT MODIFICATION REQUEST) message to the source gNB-DU, including the generated RRCReconfiguration message carrying the L1/L2 inter-cell mobility configuration.

6. The source gNB-DU passes the received RRCReconfiguration message to the UE;

7. The UE responds to the source gNB-DU with an RRCReconfigurationComplete message;

8. The source gNB-DU passes the RRCReconfigurationComplete message to the gNB-CU via the UL RRC MESSAGE TRANSFER (or UE CONTEXT MODIFICATION RESPONSE) message.

9. The UE sends the low layer measurement results to the source gNB-DU.

10. The source gNB-DU decides to perform L1/L2 triggered mobility towards a candidate target cell.

11. The source gNB-DU sends an L1/L2 triggered mobility cell switch command to the UE.

In the embodiments of the present application, L1 refers to layer 1, for example, including a physical layer;

L2 refers to layer 2, for example, including a MAC layer or a MAC sublayer, a PDCP layer or a PDCP sublayer, and an RLC layer or an RLC sublayer;

L3 refers to layer 3, including, for example, an RRC layer.

Various implementations of the embodiments of the present application are described below in conjunction with the accompanying drawings. These implementations are only exemplary and are not intended to limit the present application.

Example 1

An embodiment of the present application provides a random access method, which is applied to a terminal device, such as the terminal device 102 in FIG. 2 .

FIG8 is a schematic diagram of a random access method according to Embodiment 1 of the present application. As shown in FIG8 , the method includes:

Step 801: When a random access process triggered by a first PDCCH order is in progress, a terminal device receives a second PDCCH order, and the second PDCCH order includes the same random access preamble, PRACH mask index, and uplink carrier as indicated by the first PDCCH order, and first information related to the first PDCCH order is the same as second information related to the second PDCCH order, the terminal device considers that the random access process corresponding to the second PDCCH order is the same random access process as the random access process triggered by the first PDCCH order.

The first information and the second information include at least one of TRP information, cell information, and random access opportunity (RO) information.

In some embodiments, the TRP information includes at least one of the following information:

TRP identifier or TRP index;

TAG information;

TCI state information or information of TCI state group;

Spatial relation information or information of Spatial relation group;

Information of a downlink reference signal (DL RS) or a downlink reference signal group;

information about a coreset or coreset pool; and

Information of a physical cell identity (PCI) other than the serving cell physical cell identity (PCI).

In some embodiments, the cell information includes at least one of the following information: a candidate cell index; a cell index; a candidate cell configuration index; and a cell configuration index.

In some embodiments, the cell information is included in a candidate cell configuration provided by the network device to the terminal device, for identifying the candidate cell.

In some embodiments, the random access opportunity information is also referred to as random access opportunity information.

In some embodiments, the first information and the second information further include BWP information.

In some embodiments, as shown in FIG8 , after step 801, the method further includes:

Step 802: When the terminal device believes that the random access process corresponding to the second PDCCH command and the random access process triggered by the first PDCCH command are the same random access process, the terminal device will not initiate the random access process again.

In some embodiments, as shown in FIG8 , in parallel with step 801 , the method further includes:

Step 803: When the random access process triggered by the first PDCCH order is in progress, the terminal device receives a second PDCCH order, the second PDCCH order including The same random access preamble, PRACH mask index and uplink carrier as indicated by the command, and the first information is different from the second information, or,

When a random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, and the second PDCCH command includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include the first information and/or the second PDCCH command does not include the second information, the terminal device considers that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.

For example, the second PDCCH command includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as those indicated by the first PDCCH command, but when the first PDCCH command does not include at least one of the BWP information, TRP information, cell information and random access opportunity (RO) information, and/or the second PDCCH command does not include at least one of the BWP information, TRP information, cell information and random access opportunity (RO) information, the terminal device considers that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.

That is, when a random access process triggered by a first PDCCH order is in progress, a terminal device receives a second PDCCH order, and the second PDCCH order includes the same random access preamble, PRACH mask index, and uplink carrier as indicated by the first PDCCH order, and the first information is different from the second information, the terminal device considers that the random access process corresponding to the second PDCCH order is a different random access process from the random access process triggered by the first PDCCH order. The first information is different from the second information, including: the first PDCCH order does not include the first information and/or the second PDCCH order does not include the second information.

In some embodiments, different from step 803, as shown in FIG8 , the method may also include:

Step 804: When the random access process triggered by the first PDCCH order is in progress, the terminal device receives a second PDCCH command, and the second PDCCH command includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include the first information or a part of the first information and/or the second PDCCH command does not include the second information or a part of the second information, the terminal device considers that the first information is the same as the second information. Thus, the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command. For example, when the first When a random access process triggered by a PDCCH order is in progress, the terminal device receives a second PDCCH command, and the first PDCCH command does not include the first information, but the second PDCCH command includes the second information, the terminal device considers that the first information is the same as the second information. Thus, if the terminal device receives a second PDCCH command, and the second PDCCH command includes the same random access preamble, PRACH mask index, and uplink carrier as those indicated by the first PDCCH command, the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

Alternatively, when a random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include the first information and/or the second PDCCH command does not include the second information, the terminal device does not compare the first information with the second information. For example, when a random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, and the second PDCCH command includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include the first information, but the second PDCCH command includes the second information, the terminal device believes that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

In this case, for example, after step 804 , step 802 may also be performed.

In some embodiments, after step 803, as shown in FIG8 , the method may further include:

Step 805: When the terminal device believes that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command, the terminal device initiates the random access process again according to the second PDCCH command or the terminal device does not initiate the random access process again.

In some embodiments, the terminal device in step 802 and/or step 805 will not initiate the random access process again, which means that the terminal device is performing the random access process triggered by the first PDCCH command.

In some embodiments, the first information is included in the first PDCCH command, the second information is included in the second PDCCH command, or the first information is related to the resources for sending the first PDCCH command, and the second information is related to the resources for sending the second PDCCH command.

For example, the first information is related to resources for sending the first PDCCH command, and the second information is related to resources for sending the second PDCCH command, including:

The first information is TCI state information or TCI state group information used to send the first PDCCH command, and the second information is TCI state information or TCI state group information used to send the second PDCCH command; or,

The first information is information of a control resource set (coreset) or a control resource set pool (coreset pool) associated with the first PDCCH command, and the second information is information of a control resource set (coreset) or a control resource set pool (coreset pool) associated with the second PDCCH command; or,

The first information is the TCI state (TCI state) information used to send the first PDCCH command or the physical cell identifier (PCI) information associated with the TCI state group, and the second information is the TCI state (TCI state) information used to send the second PDCCH command or the physical cell identifier (PCI) information associated with the TCI state group.

The random access method according to the embodiment of the present application is described below with a specific example.

Example 1: PDCCH ordered random access identification based on multi-DCI multi-TRP operation

In the case of multi-DCI multi-TRP operation, the first information and the second information include TRP information and/or random access opportunity (RO).

Example 1.1: The case where the first information and the second information include TRP information or random access opportunity (RO)

Solution 1: When the random access process triggered by the first PDCCH command (PDCCH order) is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index), uplink carrier and TRP information or random access opportunity (RO) as those indicated by the first PDCCH command. The terminal device believes that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

and/or,

Solution 2: When the random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include TRP information or random access opportunity (RO). However, when the second PDCCH command includes TRP information or random access opportunity (RO), the terminal device considers that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.

In some embodiments, "the first PDCCH command does not include TRP information or random access opportunity (RO), but the second PDCCH command includes TRP information or random access opportunity (RO)" can be replaced by "the first PDCCH command does not include TRP information or random access opportunity (RO)". A PDCCH command includes TRP information or a random access opportunity (RO), but a second PDCCH command does not include TRP information or a random access opportunity (RO).

In some embodiments, Scheme 2 may also be replaced by Scheme 3 as follows:

Solution 3: When the random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include TRP information or random access opportunity (RO), but the second PDCCH command includes TRP information or random access opportunity (RO), the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

In some embodiments, "the first PDCCH command does not include TRP information or random access opportunity (RO), but the second PDCCH command includes TRP information or random access opportunity (RO)" can be replaced by "the first PDCCH command includes TRP information or random access opportunity (RO), but the second PDCCH command does not include TRP information or random access opportunity (RO)".

Example 1.2: The case where the first information and the second information include TRP information and random access opportunity (RO)

Solution 1: When the random access process triggered by the first PDCCH command (PDCCH order) is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index), uplink carrier, TRP information and random access opportunity (RO) as those indicated by the first PDCCH command. The terminal device believes that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

and/or,

Solution 2: When the random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include at least one of TRP information and random access opportunity (RO), but the second PDCCH command includes at least one of TRP information and random access opportunity (RO), the terminal device considers that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.

In some embodiments, "the first PDCCH command does not include TRP information and random access opportunity (RO) The phrase "when the first PDCCH command includes at least one of TRP information and a random access opportunity (RO), but the second PDCCH command includes at least one of TRP information and a random access opportunity (RO)" can be replaced by "when the first PDCCH command includes at least one of TRP information and a random access opportunity (RO), but the second PDCCH command does not include at least one of TRP information and a random access opportunity (RO)".

In some embodiments, Scheme 2 may also be replaced by Scheme 3 as follows:

Solution 3: When the random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include at least one of TRP information and random access opportunity (RO), but the second PDCCH command includes at least one of TRP information and random access opportunity (RO), if both are the same, the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

In some embodiments, "the first PDCCH command does not include at least one of TRP information and random access opportunity (RO), but the second PDCCH command includes at least one of TRP information and random access opportunity (RO), if both included are the same" can be replaced by "the first PDCCH command includes at least one of TRP information and random access opportunity (RO), but the second PDCCH command does not include at least one of TRP information and random access opportunity (RO), if both included are the same".

Example 2: PDCCH ordered random access identification for LTM

In the case of LTM, the first information and the second information include cell information and/or random access opportunity (RO).

Example 2.1: The case where the first information and the second information include cell information or random access opportunity (RO)

Solution 1: When the random access process triggered by a first PDCCH command (PDCCH order) is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index), uplink carrier and cell information or random access opportunity (RO) as those indicated by the first PDCCH command. The terminal device believes that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

and/or,

Solution 2: When the random access process triggered by the first PDCCH order is in progress, the terminal device receives a second PDCCH order, which includes the same random access preamble, PRACH mask index and uplink carrier as indicated by the first PDCCH order. The first PDCCH command does not include cell information or random access opportunity (RO), but when the second PDCCH command includes cell information or random access opportunity (RO), the terminal device considers that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.

In some embodiments, "the first PDCCH command does not include cell information or random access opportunity (RO), but the second PDCCH command includes cell information or random access opportunity (RO)" can be replaced by "the first PDCCH command includes cell information or random access opportunity (RO), but the second PDCCH command does not include cell information or random access opportunity (RO)".

In some embodiments, Scheme 2 may also be replaced by Scheme 3 as follows:

Solution 3: When the random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include cell information or random access opportunity (RO), but the second PDCCH command includes cell information or random access opportunity (RO), the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

Example 2.2: The case where the first information and the second information include cell information and random access opportunity (RO)

Solution 1: When the random access process triggered by the first PDCCH command (PDCCH order) is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index), uplink carrier, cell information and random access opportunity (RO) as those indicated by the first PDCCH command. The terminal device believes that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

and/or,

Solution 2: When the random access process triggered by the first PDCCH order is in progress, the terminal device receives a second PDCCH order, which includes the same random access preamble, PRACH mask index and uplink carrier as those indicated by the first PDCCH order, and the first PDCCH order does not include at least one of cell information and random access opportunity (RO), but the second PDCCH order does not include at least one of cell information and random access opportunity (RO). When the second PDCCH command includes at least one of cell information and a random access opportunity (RO), the terminal device considers that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.

In some embodiments, “the first PDCCH command does not include at least one of cell information and random access opportunity (RO), but the second PDCCH command includes at least one of cell information and random access opportunity (RO)” can be replaced by “the first PDCCH command includes at least one of cell information and random access opportunity (RO), but the second PDCCH command does not include at least one of cell information and random access opportunity (RO)”

In some embodiments, Scheme 2 may also be replaced by Scheme 3 as follows:

Solution 3: When the random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, which includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include at least one of the cell information and the random access opportunity (RO). However, when the second PDCCH command includes at least one of the cell information and the random access opportunity (RO), if the included ones are the same, the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

In some embodiments, "the first PDCCH command does not include at least one of cell information and random access opportunity (RO), but the second PDCCH command includes at least one of cell information and random access opportunity (RO), if both included are the same" can be replaced by "the first PDCCH command includes at least one of cell information and random access opportunity (RO), but the second PDCCH command does not include at least one of cell information and random access opportunity (RO), if both included are the same".

Example 3: Identification of RACH procedures where RAR reception is not configured or indicated or there is no RAR reception

For the PDCCH ordered RACH process of acquiring the TA of the LTM candidate cell, RAR reception can be configured or indicated to the terminal device by the network through RRC. If RAR reception is not configured or indicated, it can be regarded as a RACH process without RAR reception.

For RACH procedures where RAR reception is not configured or indicated or there is no RAR reception:

When a random access process triggered by a first PDCCH order is in progress, a terminal device receives a second PDCCH command, the second PDCCH command including a first indication, and according to the first indication, the terminal device considers that the random access process corresponding to the second PDCCH order is the same as the random access process triggered by the first PDCCH order. The random access procedure is the same random access procedure;

The first indication is used to indicate retransmission of the PRACH or to indicate continuation of the existing RA process.

Or, on the other hand,

While a random access process triggered by a first PDCCH order is in progress, a terminal device receives a second PDCCH command, and the second PDCCH command includes a first indication. According to the first indication, the terminal device considers that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.

The first indication is used to indicate the initial transmission of the PRACH or to indicate the triggering of a new RA process.

In some embodiments, the first indication uses 1 bit to indicate the initial transmission of PRACH or the retransmission of PRACH. For example, a value of 0 indicates the retransmission of PRACH, and a value of 1 indicates the initial transmission of PRACH; or a value of 0 indicates the initial transmission of PRACH, and a value of 1 indicates the retransmission of PRACH.

In some embodiments, the first PDCCH command and/or the second PDCCH command further includes at least one of the following:

Indication of candidate cells, for example, using reserved bits in DCI format 1_0 of PDCCH order;

A random access preamble index, such as one or more random access preamble indexes;

an indication of a PRACH occasion, such as an indication of one or more PRACH occasions;

An associated SSB index, such as one or more associated SSB indexes.

In some embodiments, Example 3 can be combined with Example 2. For example, if according to Example 2, the second PDCCH command triggers a new RA process, but according to Example 3, the second PDCCH command triggers the same RA process, it is considered to be a new RA process; or, if according to Example 2, the second PDCCH command triggers the same RA process, but according to Example 3, the second PDCCH command triggers a new RA process, it is considered to be a new RA process. Or, in these two cases, it is determined by the terminal device implementation. Or, it is considered to be the same RA process.

It can be seen from the above embodiment that when the random access process triggered by the first PDCCH command (PDCCH order) is in progress, the terminal device receives a second PDCCH command, and the second PDCCH command includes a first indication. According to the first indication, the terminal device believes that the random access process corresponding to the second PDCCH command is the same as or a different random access process from the random access process triggered by the first PDCCH command. In this way, the terminal device can trigger a new random access process based on the second PDCCH command, thereby obtaining the TA value of the candidate cell.

It can be seen from the above embodiment that when the random access process triggered by the first PDCCH command (PDCCH order) is in progress, the terminal device receives a second PDCCH command, and the second PDCCH command includes When the PDCCH command indicates the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier, and the first information related to the first PDCCH command is the same as the second information related to the second PDCCH command, the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command. In this way, when the first information is different from the second information, the terminal device can trigger a new random access process based on the second PDCCH command, thereby obtaining the TA value of the candidate cell.

Example 2

FIG9 is a schematic diagram of a random access method according to Embodiment 2 of the present application. As shown in FIG9 , the method includes:

Step 901: The terminal device sends a random access preamble;

Step 902: The terminal device monitors PDCCH to receive a random access response (RAR) identified by RA-RNTI or MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information, and/or the PDCCH is associated with a search space or control resource set related to a candidate cell.

In some embodiments, the random access response is used to obtain or update a timing advance (TA) value of a candidate cell.

In some embodiments, the RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information of the candidate cell. That is, the method is applicable to the candidate cell.

For example, the RA-RNTI is calculated according to the following formula (1):
RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14
×80×8×4+14×80×8×2×Cell Information (1)

Among them, s_id is the index of the first OFDM symbol of the PRACH opportunity, t_id is the index of the first time slot of the PRACH opportunity in a system frame or the index of the 120kHz time slot in a system frame including the PRACH opportunity, f_id is the index of the PRACH opportunity in the frequency domain, and ul_carrier_id is the uplink carrier used for random access preamble code transmission.

For example, the MSGB-RNTI is calculated according to the following formula (2):
MSGB-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×(4+n_candidateCell)+14×80×8×2×cell information (2)

Among them, s_id is the index of the first OFDM symbol of the PRACH opportunity, and t_id is the index of the first OFDM symbol of the PRACH opportunity. The index of a timeslot in a system frame or the index of a 120kHz timeslot in a system frame including a PRACH opportunity, f_id is the index of the PRACH opportunity in the frequency domain, ul_carrier_id is the uplink carrier used for random access preamble transmission, and n_candidateCell is the number of candidate cells.

In some embodiments, the RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information of the serving cell or the candidate cell. That is, the method is applicable to the serving cell or the candidate cell.

For example, the RA-RNTI is calculated according to the following formula (3):
RA-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id)×(1
+City Information) (3)

For example, the MSGB-RNTI is calculated according to the following formula (4):
MSGB-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×2)×(1+cell information)+14×80×8×n_candidateCell (4)

Where s_id is the index of the first OFDM symbol of the PRACH opportunity, t_id is the index of the first time slot of the PRACH opportunity in a system frame or the index of the 120kHz time slot in a system frame including the PRACH opportunity, f_id is the index of the PRACH opportunity in the frequency domain, ul_carrier_id is the uplink carrier used for random access preamble transmission, and n_candidateCell is the number of candidate cells.

In some embodiments, the cell information of the serving cell is set to 0.

In some embodiments, the search space or the control resource set is associated with one or more candidate cells.

In some embodiments, the search space is associated with a candidate cell; and/or the control resource set is associated with a candidate cell.

For example, the control resource set being associated with one or more candidate cells includes: a control resource set pool associated with the control resource set being associated with one or more candidate cells.

As can be seen from the above embodiments, the terminal device monitors the PDCCH to receive a random access response (RAR) identified by the RA-RNTI or MSGB-RNTI, wherein the RA-RNTI or MSGB-RNTI is based on at least the cell information Calculate and/or associate the PDCCH with the search space or control resource set related to the candidate cell, so that the terminal device can determine whether the received RAR is its own, and determine which candidate cell the received RAR belongs to, thereby confirming the TA of the candidate cell.

Example 3

The embodiment of the present application provides a random access method, which is applied to a network device, such as the terminal device 101 in Figure 2. The method corresponds to the method in Example 2, and the same content can refer to the description in Example 2.

FIG10 is a schematic diagram of a random access method according to Embodiment 3 of the present application, which is applied to a terminal device. As shown in FIG10 , the method includes:

Step 1001: The network device receives a random access preamble from the terminal device; and

Step 1002: The network device sends a PDCCH to the terminal device for scheduling a random access response (RAR) identified by the terminal device with an RA-RNTI or a MSGB-RNTI.

The RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information, and/or the PDCCH is associated with a search space or a control resource set related to the candidate cell.

In some embodiments, as shown in FIG. 10 , the method further includes:

Step 1003: The network device sends a random access response to the terminal device.

The random access response is scrambled with the RA-RNTI or the MSGB-RNTI, and the RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information.

In some embodiments, the RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information of the candidate cell.

In some embodiments, the RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information of the serving cell or the candidate cell.

In some embodiments, the cell information of the serving cell is set to 0.

For example, the control resource set is associated with one or more candidate cells, including: The resource set pool is associated with one or more candidate cells.

It can be seen from the above embodiments that the terminal device monitors PDCCH to receive a random access response (RAR) identified by RA-RNTI or MSGB-RNTI, wherein the RA-RNTI or MSGB-RNTI is calculated at least based on cell information, and/or the PDCCH is associated with a search space or control resource set related to a candidate cell. In this way, the terminal device can determine whether the received RAR is its own, and determine which candidate cell the received RAR belongs to, thereby confirming the TA of the candidate cell.

Example 4

The embodiment of the present application provides a random access device, which is arranged in a terminal device. Since the principle of solving the problem by the device is similar to the method of embodiment 1, its specific implementation can refer to the implementation of the method described in embodiment 1, and the same or related contents will not be repeated.

FIG11 is a schematic diagram of a random access device according to Embodiment 4 of the present application. As shown in FIG11 , the device 1100 includes:

The first determining unit 1101 is configured to, when a random access procedure triggered by a first PDCCH order is in progress, and the terminal device receives a second PDCCH order, the second PDCCH order including the same random access preamble, PRACH mask index and uplink carrier as indicated by the first PDCCH order, and the first information related to the first PDCCH order is the same as the second information related to the second PDCCH order, consider that the random access procedure corresponding to the second PDCCH order is the same random access procedure as the random access procedure triggered by the first PDCCH order,

TRP identifier or TRP index;

TAG information;

TCI state information or information of TCI state group;

Spatial relation information or information of Spatial relation group;

information about a coreset or coreset pool; and

In some embodiments, the cell information includes at least one of the following information: a candidate cell index; a cell index; candidate cell configuration index; and cell configuration index.

In some embodiments, as shown in FIG11 , the device further includes:

The first processing unit 1102 is configured to not initiate a random access process again when the terminal device believes that the random access process corresponding to the second PDCCH command is the same as the random access process triggered by the first PDCCH command.

For example, not initiating the random access process again means: continuing the ongoing random access process triggered by the first PDCCH command.

In some embodiments, as shown in FIG11 , the device further includes:

The second determining unit 1103 is configured to:

When a random access procedure triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH order, the second PDCCH order including the same random access preamble, PRACH mask index and uplink carrier as those indicated by the first PDCCH order, and the first information is different from the second information, or,

When a random access procedure triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH order, the second PDCCH order includes the same random access preamble, PRACH mask index and uplink carrier as those indicated by the first PDCCH order, and the first PDCCH order does not include the first information and/or the second PDCCH order does not include the second information,

It is considered that the random access procedure corresponding to the second PDCCH command and the random access procedure triggered by the first PDCCH command are different random access procedures.

In some embodiments, as shown in FIG11 , the device further includes:

The third determining unit 1104 is used to

The first information and the second information are considered to be the same.

Alternatively, the third determination unit 1104 is used for: when a random access process triggered by a first PDCCH command (PDCCH order) is in progress, the terminal device receives a second PDCCH command, and the second PDCCH command includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include the first information and/or the second PDCCH command does not include the second information, the random access process corresponding to the second PDCCH command is considered to be the same random access process as the random access process triggered by the first PDCCH command.

In some embodiments, as shown in FIG11 , the device further includes:

The second processing unit 1105 is used to initiate the random access process again or not initiate the random access process again according to the second PDCCH command when the second determination unit believes that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.

In some embodiments, the first information is included in the first PDCCH command, the second information is included in the second PDCCH command, or,

The first information is related to resources for sending the first PDCCH command, and the second information is related to resources for sending the second PDCCH command.

In some embodiments, the first information is related to a resource for sending the first PDCCH command, and the second information is related to a resource for sending the second PDCCH command, including:

In some embodiments, the specific implementation of the functions of the above-mentioned units can refer to the relevant steps in Example 1, and will not be repeated here.

Example 5

The embodiment of the present application provides a random access device, which is arranged in a terminal device. Since the principle of solving the problem by the device is similar to the method of embodiment 2, its specific implementation can refer to the implementation of the method described in embodiment 2, and the same or related contents will not be repeated.

FIG12 is a schematic diagram of a random access device according to Embodiment 5 of the present application. As shown in FIG12 , the device 1200 includes:

A first sending unit 1201, configured to send a random access preamble;

The first receiving unit 1202 is used to monitor the PDCCH to receive a random access response (RAR) identified by a RA-RNTI or a MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information, and/or the PDCCH is associated with a search space or a control resource set related to a candidate cell.

In some embodiments, the cell information of the serving cell is set to 0.

In some embodiments, the specific implementation of the functions of the above-mentioned units can refer to the relevant steps in Example 2, and will not be repeated here.

Example 6

The embodiment of the present application provides a random access device, which is arranged in a network device. Since the principle of solving the problem by the device is similar to the method of embodiment 3, its specific implementation can refer to the implementation of the method described in embodiment 3, and the same or related contents will not be repeated.

FIG13 is a schematic diagram of a random access device according to Embodiment 6 of the present application. As shown in FIG13 , the device 1300 includes:

A second receiving unit 1301 is configured to receive a random access preamble from a terminal device; and

The second sending unit 1302 is configured to send a PDCCH to the terminal device for scheduling a random access response (RAR) identified by the terminal device with an RA-RNTI or a MSGB-RNTI,

In some embodiments, as shown in FIG13 , the device further comprises:

The third sending unit 1303 is configured to send a random access response to the terminal device.

In some embodiments, the cell information of the serving cell is set to 0.

In some embodiments, the specific implementation of the functions of the above-mentioned units can refer to the relevant steps in Example 3, and will not be repeated here.

Example 7

An embodiment of the present application provides a terminal device, which includes a random access device as described in Example 4 or Example 5.

FIG14 is a schematic block diagram of the system structure of the terminal device of Embodiment 7 of the present application. As shown in FIG14 , the terminal device 1400 may include a processor 1410 and a memory 1420; the memory 1420 is coupled to the processor 1410. It is worth noting that this figure is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

In one embodiment, the functionality of the random access device may be integrated into the processor 1410 .

Corresponding to Example 4, the processor 1410 is configured to: when a random access process triggered by a first PDCCH command (PDCCH order) is in progress, the terminal device receives a second PDCCH command, and the second PDCCH command includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first information related to the first PDCCH command is the same as the second information related to the second PDCCH command, the terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command, and the first information and the second information include at least one of TRP information, cell information and random access opportunity (RO) information.

Corresponding to Embodiment 5, the processor 1410 is configured as follows: the terminal device sends a random access preamble; the terminal The end device monitors PDCCH to receive a random access response (RAR) identified by RA-RNTI or MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information, and/or the PDCCH is associated with a search space or control resource set related to a candidate cell.

In another embodiment, the random access device may be configured separately from the processor 1410 . For example, the random access device may be configured as a chip connected to the processor 1410 , and the functions of the random access device are implemented under the control of the processor 1410 .

As shown in FIG14 , the terminal device 1400 may further include: a communication module 1430, an input unit 1440, a display 1450, and a power supply 1460. It is worth noting that the terminal device 1400 does not necessarily include all the components shown in FIG15 ; in addition, the terminal device 1400 may also include components not shown in FIG14 , and reference may be made to related technologies.

As shown in FIG. 14 , the processor 1410 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor device and/or logic device. The processor 1410 receives inputs and controls the operations of various components of the terminal device 1400 .

Among them, the memory 1420, for example, can be one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. Various data can be stored, and programs for executing related information can also be stored. And the processor 1410 can execute the program stored in the memory 1420 to implement information storage or processing, etc. The functions of other components are similar to the existing ones and are not repeated here. The various components of the terminal device 1400 can be implemented by dedicated hardware, firmware, software or a combination thereof without departing from the scope of the present invention.

It can be seen from the above embodiment that when the random access process triggered by the first PDCCH command (PDCCH order) is in progress, the terminal device receives a second PDCCH command, and the second PDCCH command includes the same random access preamble code, PRACH mask index (PRACH mask index) and uplink carrier as indicated by the first PDCCH command, and the first information related to the first PDCCH command is the same as the second information related to the second PDCCH command. The terminal device considers that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command. In this way, when the first information is different from the second information, the terminal device can trigger a new random access process based on the second PDCCH command, thereby obtaining the TA value of the candidate cell.

Alternatively, the terminal device monitors the PDCCH to receive a random access response (RAR) identified by a RA-RNTI or a MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information, and/or, The PDCCH is associated with a search space or control resource set related to the candidate cell, so that the terminal device can determine whether the received RAR is its own, and determine which candidate cell the received RAR belongs to, thereby confirming the TA of the candidate cell.

Example 8

An embodiment of the present application provides a network device, which includes the random access device as described in Example 6.

FIG15 is a schematic block diagram of the system structure of the network device of Embodiment 8 of the present application. As shown in FIG15 , the network device 1500 may include: a processor 1510 and a memory 1520; the memory 1520 is coupled to the processor 1510. The memory 1520 may store various data; in addition, it also stores a program 1530 for information processing, and executes the program 1530 under the control of the processor 1510 to receive various information sent by the terminal device and send various information to the terminal device.

In one embodiment, the functionality of the random access device may be integrated into the processor 1510 .

Processor 1510 can be configured as: a network device receives a random access preamble code from a terminal device; and the network device sends a PDCCH to the terminal device for scheduling a random access response (RAR) of the terminal device identified by an RA-RNTI or an MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated at least based on cell information, and/or the PDCCH is associated with a search space or a control resource set related to a candidate cell.

In another embodiment, the random access device may be configured separately from the processor 1510 . For example, the random access device may be configured as a chip connected to the processor 1510 , and the functions of the random access device are implemented under the control of the processor 1510 .

In addition, as shown in FIG15 , the network device 1500 may further include: a transceiver 1540 and an antenna 1550, etc.; wherein the functions of the above components are similar to those of the prior art and are not described in detail here. It is worth noting that the network device 1500 does not necessarily include all the components shown in FIG15 ; in addition, the network device 1500 may also include components not shown in FIG15 , which may refer to the prior art.

It can be seen from the above embodiments that when the terminal device sends a random access preamble code on the candidate cell, and/or when the terminal device receives a PDCCH transmission in the search space (search space) or control resource set (coreset) related to the candidate cell, it is determined that the random access process on the candidate cell is completed; or, when the terminal device receives a random access response, it is determined that the random access process on the candidate cell is completed. In this way, the terminal can determine the completion of the random access process and avoid affecting the transmission on the serving cell.

Example 9

The embodiment of the present application provides a communication system, including the terminal device according to embodiment 7 and/or the network device according to embodiment 8. For specific contents, please refer to the records in embodiment 7 and embodiment 8.

For example, the structure of the communication system can refer to Figure 2. As shown in Figure 2, the communication system 100 includes a network device 101 and a terminal device 102. The terminal device 102 can be the same as the terminal device recorded in Example 7, and/or, the network device 101 can be the same as the network device recorded in Example 8. The repeated content will not be repeated.

The above devices and methods of the present application can be implemented by hardware, or by hardware combined with software. The present application relates to such a computer-readable program, which, when executed by a logic component, enables the logic component to implement the above-mentioned devices or components, or enables the logic component to implement the various methods or steps described above. The logic component is, for example, a field programmable logic component, a microprocessor, a processor used in a computer, etc. The present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

The method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two. For example, one or more of the functional block diagrams shown in FIG. 11 and/or one or more combinations of functional block diagrams may correspond to various software modules of a computer program flow or to various hardware modules. These software modules may correspond to the various steps shown in FIG. 8, respectively. These hardware modules may be implemented by solidifying these software modules, for example, using a field programmable gate array (FPGA).

The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in a memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if a device (such as a mobile terminal) uses a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.

One or more of the functional blocks described in FIG. 11 and/or one or more combinations of the functional blocks may be implemented as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any appropriate combination thereof for performing the functions described in the present application. One or more of the functional blocks described in FIG. 11 and/or one or more combinations of the functional blocks may also be implemented as a computer device. A combination, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

The present application is described above in conjunction with specific implementation methods, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and these modifications and variations are also within the scope of the present application.

According to various implementations disclosed in the examples of this application, the following notes are also disclosed:

Note 1:

1. A random access device, the device being arranged in a terminal device, the device comprising:

A first determining unit is configured to, when a random access procedure triggered by a first PDCCH order is in progress, and the terminal device receives a second PDCCH command, the second PDCCH command including the same random access preamble, PRACH mask index and uplink carrier as indicated by the first PDCCH command, and first information related to the first PDCCH command is the same as second information related to the second PDCCH command, consider that the random access procedure corresponding to the second PDCCH command is the same random access procedure as the random access procedure triggered by the first PDCCH command,

2. The device according to Note 1, wherein the TRP information includes at least one of the following information:

TRP identifier or TRP index;

TAG information;

TCI state information or information of TCI state group;

Spatial relation information or information of Spatial relation group;

information about a coreset or coreset pool; and

3. The apparatus according to Note 1 or 2, wherein the cell information includes at least one of the following information:

Candidate cell index;

Cell index;

candidate cell configuration index; and

Cell configuration index.

4. The device according to Note 3, wherein:

The cell information is included in the candidate cell configuration provided by the network device to the terminal device and is used to identify the candidate cell.

5. The device according to any one of Notes 1-4, wherein the first information and the second information also include BWP information.

6. The device according to any one of Notes 1 to 5, wherein the device further comprises:

The first processing unit is used to not initiate the random access process again when the terminal device believes that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.

7. The device according to any one of Notes 1 to 6, wherein the device further comprises:

The second determining unit is configured to:

When a random access procedure triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH order, the second PDCCH order includes the same random access preamble, PRACH mask index and uplink carrier as those indicated by the first PDCCH order, and the first information is different from the second information, or,

8. The device according to any one of Notes 1 to 6, wherein the device further comprises:

The third determining unit is used to

When a random access procedure triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH order, where the second PDCCH order includes the same random access preamble, PRACH mask index, and uplink carrier as indicated by the first PDCCH order, and the first PDCCH command does not include the first information and/or the second PDCCH command does not include the second information,

The first information and the second information are considered to be the same.

9. The device according to Note 7, wherein the device further comprises:

A second processing unit is used to initiate the random access process again or not initiate the random access process again according to the second PDCCH command when the second determining unit believes that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.

10. The device according to any one of Notes 1 to 9, wherein:

The first information is included in the first PDCCH command, the second information is included in the second PDCCH command, or,

11. The apparatus according to note 10, wherein the first information is related to resources for sending the first PDCCH command, and the second information is related to resources for sending the second PDCCH command, including:

The first information is the TCI state (TCI state) information used for sending the first PDCCH command or the physical cell identifier (PCI) information associated with the TCI state group, and the second information is the TCI state (TCI state) information used for sending the second PDCCH command or the physical cell identifier (PCI) information associated with the TCI state group.

12. A random access device, the device being arranged in a terminal device, the device comprising:

A first sending unit, configured to send a random access preamble;

A first receiving unit is used to monitor the PDCCH to receive a random access response (RAR) identified by a RA-RNTI or a MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information, and/or the PDCCH is associated with a search space or a control resource set related to a candidate cell.

13. The device according to Note 12, wherein:

The random access response is used to obtain or update a timing advance (TA) value of a candidate cell.

14. The device according to Note 12 or 13, wherein:

The RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information of the candidate cell.

15. The apparatus according to any one of Notes 12 to 14, wherein the RA-RNTI is calculated according to the following formula (1):
RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14
×80×8×4+14×80×8×2×Cell Information (1)

16. The apparatus according to any one of Notes 12 to 15, wherein the MSGB-RNTI is calculated according to the following formula (2):
MSGB-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×(4+n_candidateCell)+14×80×8×2×cell information (2)

17. The device according to Note 12, wherein:

The RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information of the serving cell or the candidate cell.

18. The apparatus according to Note 12, 13 or 17, wherein the RA-RNTI is calculated according to the following formula (3):
RA-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id)×(1
+City Information) (3)

Where s_id is the index of the first OFDM symbol of the PRACH opportunity, t_id is the index of the first time slot of the PRACH opportunity in a system frame or the index of the 120kHz time slot in a system frame including the PRACH opportunity, f_id is the index of the PRACH opportunity in the frequency domain, and ul_carrier_id is used for random access preamble transmission. Uplink carrier.

19. The apparatus according to Note 12, 13, 17 or 18, wherein the MSGB-RNTI is calculated according to the following formula (4):
MSGB-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×2)×(1+cell information)+14×80×8×n_candidateCell (4)

20. The apparatus according to any one of Notes 12 to 19, wherein the cell information includes at least one of the following information:

Candidate cell index;

Cell index;

candidate cell configuration index; and

Cell configuration index.

21. The device according to any one of Notes 17-19, wherein the cell information of the serving cell is set to 0.

22. The device according to Note 12, wherein:

The search space or the control resource set is associated with one or more candidate cells.

23. The device according to Note 22, wherein:

The search space is associated with a candidate cell; and/or,

The control resource set is associated with a candidate cell.

24. The device according to Note 22 or 23, wherein the control resource set being associated with one or more candidate cells comprises: a control resource set pool associated with the control resource set being associated with one or more candidate cells.

25. A random access device, the device being arranged in a network device, the device comprising:

A second receiving unit, configured to receive a random access preamble from a terminal device; and

A second sending unit is configured to send a PDCCH to the terminal device, for scheduling a random access response (RAR) identified by the terminal device with an RA-RNTI or a MSGB-RNTI,

The RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information, and/or the The PDCCH is associated with a search space or a control resource set related to a candidate cell.

26. The device according to Note 25, wherein the device further comprises:

A third sending unit is configured to send a random access response to the terminal device,

The random access response is scrambled with RA-RNTI or MSGB-RNTI, and the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information.

27. The device according to Note 25 or 26, wherein:

28. The device according to any one of Notes 25 to 27, wherein:

29. The apparatus according to any one of Notes 25 to 28, wherein the RA-RNTI is calculated according to the following formula (1):
RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14
×80×8×4+14×80×8×2×Cell Information (1)

30. The apparatus according to any one of Notes 25 to 28, wherein the MSGB-RNTI is calculated according to the following formula (2):
MSGB-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×(4+n_candidateCell)+14×80×8×2×cell information (2)

31. The device according to any one of Notes 25 to 27, wherein:

32. The apparatus according to any one of Notes 25-27 and 31, wherein the RA-RNTI is based on The following formula (3) is used to calculate:
RA-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id)×(1
+City Information) (3)

33. The apparatus according to any one of Notes 25-27, 31-32, wherein the MSGB-RNTI is calculated according to the following formula (4):
MSGB-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×2)×(1+cell information)+14×80×8×n_candidateCell (4)

34. The apparatus according to any one of Notes 25 to 33, wherein the cell information includes at least one of the following information:

Candidate cell index;

Cell index;

candidate cell configuration index; and

Cell configuration index.

35. An apparatus according to any one of Notes 31-33, wherein the cell information of the serving cell is set to 0.

36. The device according to Note 25, wherein:

37. The device according to Note 36, wherein:

The search space is associated with a candidate cell; and/or,

The control resource set is associated with a candidate cell.

38. The apparatus according to Note 36 or 37, wherein the control resource set is associated with one or more candidate Selecting a cell includes: associating a control resource set pool associated with the control resource set with one or more candidate cells.

39. A terminal device, comprising the apparatus as described in any one of Notes 1-11.

40. A communication system, comprising the terminal device and network device described in Note 39.

41. A terminal device, comprising the apparatus described in any one of Notes 12-24.

42. A network device, comprising the apparatus described in any one of Notes 25-38.

43. A communication system, comprising the terminal device described in Note 41 and/or the network device described in Note 42.

Note 2:

1. A random access method, the method comprising:

When a random access procedure triggered by a first PDCCH order is in progress, a terminal device receives a second PDCCH command, and the second PDCCH command includes the same random access preamble, PRACH mask index, and uplink carrier as indicated by the first PDCCH command, and first information related to the first PDCCH command is the same as second information related to the second PDCCH command, the terminal device considers that the random access procedure corresponding to the second PDCCH command is the same random access procedure as the random access procedure triggered by the first PDCCH command,

2. The method according to Note 1, wherein the TRP information includes at least one of the following information:

TRP identifier or TRP index;

TAG information;

TCI state information or information of TCI state group;

Spatial relation information or information of Spatial relation group;

information about a coreset or coreset pool; and

3. The method according to Note 1 or 2, wherein the cell information includes at least one of the following information:

Candidate cell index;

Cell index;

candidate cell configuration index; and

Cell configuration index.

4. The method according to Note 3, wherein:

5. The method according to any one of Notes 1-4, wherein the first information and the second information also include BWP information.

6. The method according to any one of Notes 1 to 5, wherein the method further comprises:

When the terminal device believes that the random access process corresponding to the second PDCCH command and the random access process triggered by the first PDCCH command are the same random access processes, the terminal device will not initiate the random access process again.

7. The method according to any one of Notes 1 to 6, wherein the method further comprises:

The terminal device considers that the random access process corresponding to the second PDCCH command and the random access process triggered by the first PDCCH command are different random access processes.

8. The method according to any one of Notes 1 to 6, wherein the method further comprises:

When a random access process triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH command, wherein the second PDCCH command includes the same random access preamble, PRACH mask index, and uplink carrier as indicated by the first PDCCH command, and the first PDCCH command does not include the first information and/or the second PDCCH command does not include the The second message

The terminal device considers that the first information and the second information are the same.

9. The method according to Note 7, wherein the method further comprises:

When the terminal device believes that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command, the terminal device initiates the random access process again according to the second PDCCH command or the terminal device does not initiate the random access process again.

10. The method according to any one of Notes 1 to 9, wherein:

11. The method according to Note 10, wherein the first information is related to a resource for sending the first PDCCH command, and the second information is related to a resource for sending the second PDCCH command, including:

12. A random access method, the method comprising:

The terminal device sends a random access preamble;

The terminal device monitors PDCCH to receive a random access response (RAR) identified by RA-RNTI or MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information, and/or the PDCCH is associated with a search space or control resource set related to a candidate cell.

13. The method according to Note 12, wherein:

14. The method according to Note 12 or 13, wherein:

15. The method according to any one of Notes 12 to 14, wherein the RA-RNTI is calculated according to the following formula (1):
RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14
×80×8×4+14×80×8×2×Cell Information (1)

16. The method according to any one of Notes 12 to 15, wherein the MSGB-RNTI is calculated according to the following formula (2):
MSGB-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×(4+n_candidateCell)+14×80×8×2×cell information (2)

17. The method according to Note 12, wherein:

18. The method according to Note 12, 13 or 17, wherein the RA-RNTI is calculated according to the following formula (3):
RA-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id)×(1
+City Information) (3)

19. The method according to Note 12 or 13 or 17 or 18, wherein the MSGB-RNTI is calculated according to the following formula (4):
MSGB-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×2)×(1+cell information)+14×80×8×n_candidateCell (4)

20. The method according to any one of Notes 12 to 19, wherein the cell information includes at least one of the following information:

Candidate cell index;

Cell index;

candidate cell configuration index; and

Cell configuration index.

21. A method according to any one of Notes 17-19, wherein the cell information of the service cell is set to 0.

22. The method according to Note 12, wherein:

23. The method according to Note 22, wherein:

The search space is associated with a candidate cell; and/or,

The control resource set is associated with a candidate cell.

24. The method according to Note 22 or 23, wherein the control resource set is associated with one or more candidate cells, including: the control resource set pool associated with the control resource set is associated with one or more candidate cells.

25. A random access method, the method comprising:

The network device receives a random access preamble from the terminal device; and

The network device sends a PDCCH to the terminal device for scheduling a random access response (RAR) identified by the terminal device with an RA-RNTI or a MSGB-RNTI,

26. The method according to Note 25, wherein the method further comprises:

The network device sends a random access response to the terminal device,

27. The method according to Note 25 or 26, wherein:

28. The method according to any one of Notes 25 to 27, wherein:

29. The method according to any one of Notes 25 to 28, wherein the RA-RNTI is calculated according to the following formula (1):
RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14
×80×8×4+14×80×8×2×Cell Information (1)

30. The method according to any one of Notes 25 to 28, wherein the MSGB-RNTI is calculated according to the following formula (2):
MSGB-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×(4+n_candidateCell)+14×80×8×2×cell information (2)

31. The method according to Note 25 or 26, wherein:

32. The method according to any one of Notes 25-27 and 31, wherein the RA-RNTI is calculated according to the following formula (3):
RA-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id)×(1
+City Information) (3)

33. The method according to any one of Notes 25-27, 31-32, wherein the MSGB-RNTI is calculated according to the following formula (4):
MSGB-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×2)×(1+cell information)+14×80×8×n_candidateCell (4)

34. The method according to any one of Notes 25 to 33, wherein the cell information includes at least one of the following information:

Candidate cell index;

Cell index;

candidate cell configuration index; and

Cell configuration index.

35. A method according to any one of Notes 31-33, wherein the cell information of the service cell is set to 0.

36. The method according to Note 25, wherein:

37. The method according to Note 36, wherein:

The search space is associated with a candidate cell; and/or,

The control resource set is associated with a candidate cell.

38. The method according to Note 36 or 37, wherein the control resource set is associated with one or more candidate cells, including: the control resource set pool associated with the control resource set is associated with one or more candidate cells.

Claims

A random access device, the device is arranged in a terminal device, the device comprises:

A first determining unit is configured to, when a random access procedure triggered by a first PDCCH order is in progress, and the terminal device receives a second PDCCH command, the second PDCCH command including the same random access preamble, PRACH mask index and uplink carrier as indicated by the first PDCCH command, and first information related to the first PDCCH command is the same as second information related to the second PDCCH command, consider that the random access procedure corresponding to the second PDCCH command is the same random access procedure as the random access procedure triggered by the first PDCCH command,

The first information and the second information include at least one of TRP information, cell information, and random access opportunity (RO) information.
The apparatus according to claim 1, wherein the TRP information comprises at least one of the following information:

TRP identifier or TRP index;

TAG information;

TCI state information or information of TCI state group;

Spatial relation information or information of Spatial relation group;

Information of a downlink reference signal (DL RS) or a downlink reference signal group;

information about a coreset or coreset pool; and

Information of a physical cell identity (PCI) other than the serving cell physical cell identity (PCI).
The apparatus according to claim 1, wherein the cell information comprises at least one of the following information:

Candidate cell index;

Cell index;

candidate cell configuration index; and

Cell configuration index.
The apparatus according to claim 1, wherein the first information and the second information further include BWP information.
The device according to claim 1, wherein the device further comprises:

The first processing unit is used to not initiate the random access process again when the terminal device believes that the random access process corresponding to the second PDCCH command is the same random access process as the random access process triggered by the first PDCCH command.
The device according to claim 1, wherein the device further comprises:

The second determining unit is configured to:

When a random access procedure triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH order, the second PDCCH order includes the same random access preamble, PRACH mask index and uplink carrier as those indicated by the first PDCCH order, and the first information is different from the second information, or,

When a random access procedure triggered by a first PDCCH order is in progress, the terminal device receives a second PDCCH order, the second PDCCH order includes the same random access preamble, PRACH mask index and uplink carrier as those indicated by the first PDCCH order, and the first PDCCH order does not include the first information and/or the second PDCCH order does not include the second information,

It is considered that the random access procedure corresponding to the second PDCCH command and the random access procedure triggered by the first PDCCH command are different random access procedures.
The device according to claim 6, wherein the device further comprises:

A second processing unit is used to initiate the random access process again or not initiate the random access process again according to the second PDCCH command when the second determining unit believes that the random access process corresponding to the second PDCCH command is a different random access process from the random access process triggered by the first PDCCH command.
The device according to claim 1, wherein

The first information is included in the first PDCCH command, the second information is included in the second PDCCH command, or,

The first information is related to resources for sending the first PDCCH command, and the second information is related to resources for sending the second PDCCH command.
The apparatus according to claim 8, wherein the first information is related to a resource for sending the first PDCCH command, and the second information is related to a resource for sending the second PDCCH command, comprising:

The first information is TCI state information or TCI state group information used to send the first PDCCH command, and the second information is TCI state information used to send the second PDCCH command. or TCI status group; or,

The first information is information of a control resource set (coreset) or a control resource set pool (coreset pool) associated with the first PDCCH command, and the second information is information of a control resource set (coreset) or a control resource set pool (coreset pool) associated with the second PDCCH command; or,

The first information is the TCI state (TCI state) information used for sending the first PDCCH command or the physical cell identifier (PCI) information associated with the TCI state group, and the second information is the TCI state (TCI state) information used for sending the second PDCCH command or the physical cell identifier (PCI) information associated with the TCI state group.
A random access device, the device is arranged in a terminal device, the device comprises:

A first sending unit, configured to send a random access preamble;

A first receiving unit is used to monitor the PDCCH to receive a random access response (RAR) identified by a RA-RNTI or a MSGB-RNTI, wherein the RA-RNTI or the MSGB-RNTI is calculated based on at least cell information, and/or the PDCCH is associated with a search space or a control resource set related to a candidate cell.
The device according to claim 10, wherein

The random access response is used to obtain or update a timing advance (TA) value of a candidate cell.
The apparatus according to claim 10, wherein the RA-RNTI is calculated according to the following formula (1):
RA-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14
×80×8×4+14×80×8×2×Cell Information (1)

Among them, s_id is the index of the first OFDM symbol of the PRACH opportunity, t_id is the index of the first time slot of the PRACH opportunity in a system frame or the index of the 120kHz time slot in a system frame including the PRACH opportunity, f_id is the index of the PRACH opportunity in the frequency domain, and ul_carrier_id is the uplink carrier used for random access preamble code transmission.
The apparatus according to claim 10, wherein the MSGB-RNTI is calculated according to the following formula (2):
MSGB-RNTI＝1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×(4+n_candidateCell)+14×80×8×2×cell information (2)

Where s_id is the index of the first OFDM symbol of the PRACH opportunity, and t_id is the index of the first time slot of the PRACH opportunity in a system frame or the index of the 120kHz time slot in a system frame including the PRACH opportunity. index, f_id is the index of the PRACH opportunity in the frequency domain, ul_carrier_id is the uplink carrier used for random access preamble transmission, and n_candidateCell is the number of candidate cells.
The apparatus according to claim 10, wherein the RA-RNTI is calculated according to the following formula (3):
RA-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id)×(1
+City Information) (3)

Among them, s_id is the index of the first OFDM symbol of the PRACH opportunity, t_id is the index of the first time slot of the PRACH opportunity in a system frame or the index of the 120kHz time slot in a system frame including the PRACH opportunity, f_id is the index of the PRACH opportunity in the frequency domain, and ul_carrier_id is the uplink carrier used for random access preamble code transmission.
The apparatus according to claim 10, wherein the MSGB-RNTI is calculated according to the following formula (4):
MSGB-RNTI=(1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+
14×80×8×2)×(1+cell information)+14×80×8×n_candidateCell (4)

Where s_id is the index of the first OFDM symbol of the PRACH opportunity, t_id is the index of the first time slot of the PRACH opportunity in a system frame or the index of the 120kHz time slot in a system frame including the PRACH opportunity, f_id is the index of the PRACH opportunity in the frequency domain, ul_carrier_id is the uplink carrier used for random access preamble transmission, and n_candidateCell is the number of candidate cells.
The device according to claim 10, wherein

The search space or the control resource set is associated with one or more candidate cells.
A random access device, the device is arranged in a network device, the device comprising:

A second receiving unit, configured to receive a random access preamble from a terminal device; and

A second sending unit is configured to send a PDCCH to the terminal device, for scheduling a random access response (RAR) identified by the terminal device with an RA-RNTI or a MSGB-RNTI,

The RA-RNTI or the MSGB-RNTI is calculated based on at least the cell information, and/or the PDCCH is associated with a search space or a control resource set related to the candidate cell.
The device according to claim 17, wherein the device further comprises:

A third sending unit is configured to send a random access response to the terminal device,

The random access response is scrambled with RA-RNTI or MSGB-RNTI, the RA-RNTI or The MSGB-RNTI is calculated based on at least the cell information.
The device according to claim 17, wherein

The search space or the control resource set is associated with one or more candidate cells.
The apparatus according to claim 19, wherein the control resource set is associated with one or more candidate cells comprises: a control resource set pool associated with the control resource set is associated with one or more candidate cells.