A method and apparatus for physical layer mobility handover

Abstract

A method for physical layer mobility handover, for a terminal side device, comprising the following steps: sending measurement information, the measurement information comprising measurement values of a serving cell and at least one neighbor cell; receiving first control information from the serving cell, wherein the first control information indicates a random access resource configuration corresponding to a target neighbor cell; sending a corresponding random access preamble to the target neighbor cell; receiving second control information from the serving cell, and obtaining an uplink timing advance for the target neighbor cell from the second control information. The application also comprises steps for a network side device. The application also comprises an apparatus for implementing the method. The application solves the problem of uncertainty of uplink timing advance of a target neighbor cell before cell handover, and is particularly suitable for application scenarios of 5G NR introducing L1 / L2 mobility enhancement.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a method and apparatus for physical layer mobility handover. Background Technology

[0002] One method for triggering the random access procedure in a 5G NR system is PDCCH order triggering. This occurs when the base station detects downlink data to be sent to the terminal in the MAC buffer, and the UE's time alignment timer expires, causing uplink synchronization problems. The network then resynchronizes with the terminal via a PDCCH command. The base station sends a Random Access Response (RAR), which contains the following information: the preamble sequence index number detected by the base station, time adjustment information for uplink synchronization, initial uplink resource allocation (for sending subsequent MSG3), and a temporary C-RNTI. Power control of the preamble transmit power during the random access procedure is open-loop power control. This means the terminal cannot adjust the preamble transmit power based on any feedback from the base station; the terminal can only determine whether to adjust the preamble transmit power based on whether the preamble transmission was successful.

[0003] When a UE moves from the coverage area of ​​one cell to another, a serving cell change needs to be performed at some point. This serving cell change is triggered by L3 measurements and completed through reconfiguration triggered by RRC signaling, PCell synchronization, and SCell release and addition. It involves a complete L2 / L1 reset, and compared to beam switching, Layer 3 handover has longer latency, greater overhead, and longer downtime. 5G NR introduces L1 / L2 mobility enhancements, aiming to achieve serving cell changes through L1 / L2 signaling to reduce latency, overhead, and downtime.

[0004] To achieve L1 / L2 mobility enhancement, physical layer control signaling can enable handover from the serving cell to the target neighboring cell. The challenge lies in knowing the uplink timing advance (TA) of the target neighboring cell before the handover to ensure correct access. While 5G NR systems support TA acquisition triggered by the serving cell's PDCCH, they do not yet support acquiring neighboring cell TAs, nor do they address the triggering conditions for acquiring neighboring cell TAs, the effective maintenance of neighboring cell TAs, or how terminals can obtain relevant neighboring cell TA information. Summary of the Invention

[0005] This application proposes a physical layer mobility handover method and device to solve the problem of uncertain uplink timing advance of the target neighboring cell before cell handover. It can use PDCCH triggering to obtain the TA of the target neighboring cell, which is especially suitable for application scenarios where L1 / L2 mobility enhancement is introduced in 5G NR.

[0006] In a first aspect, embodiments of this application propose a physical layer mobility handover method for a terminal-side device, comprising the following steps:

[0007] Send measurement information, which includes measurement values ​​of the serving cell and neighboring cells in the neighboring cell list;

[0008] Receive first control information from the serving cell, wherein the random access resource configuration is indicated for at least one first target neighboring cell;

[0009] Send the corresponding random access preamble to the first target neighboring cell;

[0010] Receive third control information from the serving cell, and obtain uplink timing advance for the second target neighbor cell and / or indication information for switching from the serving cell to the second target neighbor cell.

[0011] Preferably, the first control information includes cell identifiers of one or more first target neighboring cells, and the third control information includes cell identifiers of second target neighboring cells.

[0012] Preferably, prior to the above steps, the method further includes the following step: receiving configuration information, which includes the physical cell identifier (PCI) of the neighboring cell and associated beam information.

[0013] Secondly, embodiments of this application also propose a physical layer mobility handover method for network-side devices, comprising the following steps:

[0014] Receive measurement information, which includes measurement values ​​of the serving cell and neighboring cells in the neighboring cell list;

[0015] If the difference between the measured value of the serving cell and the measured value of the first target neighbor cell is less than a first threshold, first control information is sent, which indicates the random access resource configuration corresponding to the first target neighbor cell;

[0016] The device receives second control information from one or more of the first target neighboring cells, and obtains uplink timing advance for the first target neighboring cell from it; it sends third control information to the terminal device, forwards the uplink timing advance of the second target neighboring cell and / or instructs the terminal device to switch from the serving cell to the second target neighboring cell; the second target neighboring cell is one of the first target neighboring cell set.

[0017] Preferably, a second target neighbor cell is determined from the set of first target neighbor cells, and the difference between the measurement value of the serving cell and the measurement value of the second target neighbor cell is less than a second threshold.

[0018] Preferably, prior to the above step, the method further includes the following step: sending configuration information, which includes the physical cell identifier (PCI) of the neighboring cell and the associated beam information.

[0019] Preferably, the method includes the following steps: in response to receiving the uplink timing advance, starting a timer; in response to the timer timeout, retransmitting the first control information.

[0020] Preferably, the method includes the following steps: in response to the failure to acquire the uplink timing advance, retransmitting the first control information and increasing the power of the random access preamble sequence indicated by the first control information.

[0021] Preferably, the method includes the following steps: determining that the difference between the measurement value of the serving cell and the measurement value of the second target neighboring cell is less than a second threshold, and sending the third control information, wherein the third control information is used to instruct the terminal to switch to the second target neighboring cell; the second threshold is less than the first threshold.

[0022] More preferably, the third control information indicates the uplink timing advance of the second target neighboring cell.

[0023] Thirdly, this application also proposes a physical layer mobility handover method for network-side devices, comprising the following steps:

[0024] In the first target neighboring cell, a random access preamble from the terminal-side device is received to determine the uplink timing advance of the terminal-side device;

[0025] Send a second control message to the serving cell, which includes the uplink timing advance of the first target neighboring cell.

[0026] Fourthly, embodiments of this application propose a terminal-side device for implementing the method described in any one of the first aspects of this application. At least one module in the terminal-side device is configured to perform at least one of the following functions: determining the measurement information; sending the measurement information, receiving the first control information and / or the second control information; determining the random access preamble of the first target neighboring cell; sending the random access preamble; and determining the uplink timing advance of the second target neighboring cell and / or indication information for handover from the serving cell to the second target neighboring cell based on the third control information.

[0027] Fifthly, embodiments of this application propose a network-side device for implementing the method described in any one of the second aspects of this application. At least one module in the network-side device performs at least one of the following functions: receiving the measurement information; determining that the difference between the measurement value of the serving cell and the measurement value of a first target neighbor cell is less than a first threshold; sending the first control information; receiving the second control information; determining the uplink timing advance of the first target neighbor cell based on the second control information; starting a timer; retransmitting the first control information in response to a timer timeout; retransmitting the first control information and increasing the power of the random access preamble sequence indicated by the first control information in response to a failure to obtain the uplink timing advance; determining a second target neighbor cell in the set of first target neighbor cells, where the difference between the measurement value of the serving cell and the measurement value of the second target neighbor cell is less than a second threshold; and sending the third control information.

[0028] In a sixth aspect, embodiments of this application propose a network-side device for implementing the method described in the third aspect of the embodiments of this application. At least one module in the network-side device is used for at least one of the following functions: receiving the random access preamble; determining the uplink timing advance; and sending the second control information.

[0029] In a seventh aspect, embodiments of this application also provide a communication device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the method as described in any one of the embodiments of the first, second, and third aspects of this application.

[0030] Eighthly, embodiments of this application also provide a computer-readable medium storing a computer program that, when executed by a processor, implements the steps of the method described in any one of the embodiments of the first, second, and third aspects of this application.

[0031] Ninthly, this application also proposes a mobile communication system, characterized in that it includes at least one terminal-side device as described in any one of the fourth aspects of this application, at least one network-side device as described in any one of the fifth aspects of this application, and at least one network-side device as described in the sixth aspect of this application.

[0032] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0033] Physical layer mobility enhancement uses physical layer control information for cell handover. Therefore, the terminal needs to know the uplink timing advance to the neighboring cell before or during the handover. The method in this patent involves the serving cell determining the possible neighboring cells the terminal might handover to based on the information measured and reported by the terminal. It first sends control information to obtain the uplink timing advance of the possible neighboring cells. When the terminal meets the handover conditions, it sends control information indicating the neighboring cell information and the timing advance of the target neighboring cell. Considering the time-sensitivity of the uplink timing advance of neighboring cells, the timing advance is maintained in the serving cell or neighboring cells. This method implements the physical layer cell handover function and maintains the validity of the timing advance for handover to the target neighboring cell. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 This is a flowchart illustrating an embodiment of the method of this application;

[0036] Figure 2 This is a flowchart illustrating an embodiment of the method of this application used in a network-side device serving a cell;

[0037] Figure 3 This is a flowchart illustrating an embodiment of the method of this application used in a network-side device of a target neighboring cell;

[0038] Figure 4 This is a flowchart illustrating an embodiment of the method of this application used in a terminal-side device;

[0039] Figure 5 This is a schematic diagram of an embodiment of a network-side device;

[0040] Figure 6 This is a schematic diagram of an embodiment of the terminal-side device;

[0041] Figure 7 This is a schematic diagram of the structure of a network-side device according to another embodiment of the present invention;

[0042] Figure 8 This is a block diagram of a terminal-side device according to another embodiment of the present invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0045] Figure 1 This is a flowchart illustrating an embodiment of the method of this application.

[0046] This application proposes a physical layer mobility handover method, which realizes the acquisition, maintenance, and indication of neighbor cell timing advance. The terminal receives configuration information, indicating at least a neighbor cell PCI list and associated beam information. The terminal measures and reports measurement information to trigger the serving cell to send first control information. The terminal receives the first control information and sends uplink random access to neighbor cells in the neighbor cell list on the indicated resources to obtain the uplink timing advance of the neighbor cells. The terminal receives second control information for physical layer handover to the target neighbor cell. The specific implementation steps are as follows: including the following steps 110-170:

[0047] Step 110: The serving cell sends configuration information to the terminal, indicating at least the neighboring cell PCI list or the neighboring cell PCI list and associated beam information.

[0048] Method 1: The serving cell configures a PCI list for the terminal, indicating the TCI status of each list. For example, the serving cell configuration information indicates the TCI status of each neighboring cell in the neighboring cell configuration. For instance, the serving cell configures two neighboring cells for the terminal, namely PCI 1 and PCI2, where the beam information of PCI1 is beam 1A and beam1B, and the beam information of PCI2 is beam2A and beam2B.

[0049] Method 2: The serving cell configures the PCI list and associated beam information to the terminal. For example, in the TCI state configuration indicated by the serving cell, the neighbor cell PCI configuration information "additionalPCI" is added to indicate that this TCI state refers to the beam information of a neighbor cell. The serving cell configures eight beam state information to the terminal simultaneously, where TCI-state A1, TCI-state A2, and TCI-state A3 correspond to the serving cell, TCI-state B1, TCI-state B2, and TCI-state B3 correspond to neighbor cell B, and TCI-state C1 and TCI-state C2 correspond to neighbor cell C.

[0050] Step 120: The serving cell receiving terminal measures and reports measurement information.

[0051] Specifically, the measurement information includes RSRP, SINR, RSRQ, or other measurements.

[0052] Step 130: When the difference between the measurement information of the serving cell and the measurement information of the neighboring cell PCI exceeds a first threshold, the neighboring cell is defined as the first target neighboring cell, and the serving cell sends first control information to the terminal; the terminal sends uplink random access on the indicated resource to obtain the uplink timing advance of the first target neighboring cell.

[0053] Specifically, the serving cell sends first control information to the terminal. The first control information is used by the serving cell to trigger the terminal to initiate random access to the first target neighbor cell and to obtain the uplink timing advance (TA) of the terminal in the first target neighbor cell. The first control information includes the PCI of the triggered first target neighbor cell or the random access resource configuration of the first target neighbor cell, as well as the SSB information associated with the random access resource.

[0054] Depending on the configuration information sent to the terminal, the first control information also has two different indication methods. When method 1 is used to send the configuration information, the specific content of the first control information is as follows:

[0055] (1) In order to distinguish the random access resources of the serving cell and the first target neighboring cell, the first control information indicates the SSB resource information sent by the terminal to the neighboring cell. For example, SSB-Index information is introduced in the first control information to determine the SSB sent to the first target neighboring cell.

[0056] (2) To obtain the PCI of the neighboring cell and the corresponding Random Access Preamble Index field, configure the index of the PRACH preamble sent to the first target neighboring cell, and indicate the transmission power of the Random Access Preamble sent by the terminal to the first target neighboring cell.

[0057] (3) Instructs the terminal to determine the location of PRACH resources to be sent to the random access procedure of the first target neighboring cell. For example, the first control information includes a PRACH mask index field, indicating the location of available PRACH resources. The following table provides examples of PRACH mask index values.

[0058] Table 1. PRACH Mask Index Values

[0059]

[0060]

[0061] When sending configuration information using method 2, the specific content of the first control information is as follows:

[0062] To distinguish the random access resources of the serving cell and different neighboring cells, the first control information indicates the TCI status information to be sent to the neighboring cells by the terminal, as well as the association between the TCI status information and the random access resources. Based on the association, information such as the random access sequence preamble, the location of the random access resources, and the transmission power of the random access preamble can be obtained. The terminal sends the random access resources to the neighboring cells according to the random access resources indicated by the first control information.

[0063] Preferably, the first control information is scrambled with the terminal's identifier C-RNTI.

[0064] Preferably, similar to the NR two-step random access process, after receiving the first control information, the terminal sends a random access signal to the neighboring cell on the configured random access resources, and at the same time sends its own C-RNTI to the first target neighboring cell for the first target neighboring cell to identify the terminal.

[0065] Preferably, the first control information includes the PCI of the first target neighboring cell. The terminal learns the resource location for initiating random access to the first target neighboring cell based on the PCI, and uses it to initiate a random access procedure to the first target neighboring cell.

[0066] Step 140: The neighboring cell receives the random access preamble signal from the terminal, estimates the timing advance information of the terminal, and sends the estimated timing advance information and the received random access preamble index to the serving cell.

[0067] After the serving cell sends the first control signaling to the terminal, within a time window, the serving cell listens for the second signaling scrambled with the terminal identifier C-RNTI from the first target neighbor cell in order to receive the timing advance information from the first target neighbor cell. The time window starts at the time when the first control signaling is sent plus the first duration and lasts for N durations. Preferably, the duration is in units of time slots.

[0068] Step 150: The serving cell compares the random access preamble received from the first target neighbor cell with the random access preamble indicated by the first control information sent to the terminal, and determines whether the uplink timing advance information has been correctly received.

[0069] When the serving cell correctly receives the timing advance information from the neighboring cell, the serving cell starts a timer. After the first target neighboring cell obtains the timing advance information from the terminal, it promptly sends signaling to the serving cell, where the serving cell maintains the timing advance information and starts a timer.

[0070] When the serving cell determines that it has not correctly received the timing advance information from the neighboring cell, the serving cell resends the first signaling to the terminal and increases the power of the random access preamble transmission, or adjusts the configuration parameters of the random access resources.

[0071] Step 160: When the timer of the serving cell expires, the serving cell checks the difference between the measurement information of the serving cell and the neighboring cell reported by the terminal. If it is still less than the first threshold, the first signaling is sent to re-trigger the terminal to send the random access preamble to obtain the TA information of the first target neighboring cell.

[0072] When the serving cell receives the timed early expiration information, it needs to check the measured information again to see if the difference between the measured information of the serving cell and the first target neighbor cell is still less than the first threshold. If it still meets the requirement, the first signaling is resent to trigger the terminal to send a random access preamble to obtain the new TA information of the first target neighbor cell. If it does not meet the requirement, the first signaling does not need to be resent.

[0073] Step 170: When the timer has not expired, and the serving cell detects that the difference between the measurement information of the second target neighbor cell in the set of the serving cell and the first target neighbor cell is less than the second threshold, the serving cell sends third control information to instruct the terminal to perform physical layer handover to the second target neighbor cell. The third control information may contain timing advance information of the second target neighbor cell, or the third control information may contain only timing advance information of the second target neighbor cell.

[0074] Specifically, when the serving cell detects that the difference between the neighbor cell's measurement information and the serving cell's measurement information is less than a second threshold, the neighbor cell is identified as the second target neighbor cell, and the neighbor cell's TA information is within its validity period. This triggers the serving cell to send third control information to the terminal. The value of the second threshold must be lower than the first threshold.

[0075] Optionally, when the TA information of a neighboring cell is within its validity period, the serving cell sends third control information to the terminal after obtaining the TA information of the first target neighboring cell, indicating the TA information of the neighboring cell. This method is applicable to multi-TRP transmission scenarios where uplink data and control channels are transmitted between multiple serving cells and the terminal. After the terminal or neighboring cell obtains the TA information, beam switching for uplink data and control to the neighboring cell can be performed.

[0076] When the configuration information is sent using the first method, the third control signaling includes PCI information for switching to the second target neighbor cell, beam information for switching to the second target neighbor cell, and timing advance information for sending uplink signals to the neighbor cell and receiving downlink data.

[0077] When the configuration information is sent using the second method, the third control information includes the TCIstate information for switching to the neighboring cell. The TCIstate information includes the second target neighboring cell information, as well as the timing advance information for sending uplink signals and receiving downlink data to the second target neighboring cell.

[0078] Optionally, to obtain updated TA information, the third control information also triggers the terminal to send an SRS or random access signal using the aforementioned timing advance TA. After receiving the uplink signal, the neighboring cell can obtain the TA adjustment information and send it to the terminal to obtain more accurate TA information.

[0079] It should be noted that the above steps are used for network entities in a wireless communication system, including terminal-side devices, network-side devices, or other intermediate devices; the above steps can also be used for service devices that provide information processing for the network entity devices; the above steps can also be used for any device, system, subsystem, circuit, chip, or software entity that provides information reception, transmission, identification, and processing for terminal-side devices or network-side devices.

[0080] Figure 2 This is a flowchart illustrating an embodiment of the method of this application used in a network-side device serving a cell.

[0081] The method described in any embodiment of the first aspect of this application, used for a network-side device serving a cell, includes the following steps 210-240A:

[0082] Step 210A: Send configuration information, which includes the physical cell identifier (PCI) of neighboring cells in the neighboring cell list and the associated beam information.

[0083] The configuration information indicates the random access resource configuration of neighboring cells, as well as the beam information associated with the random access resources.

[0084] Step 220A: Receive measurement information, which includes measurement values ​​of the serving cell and at least one neighboring cell.

[0085] For example, it could be measurement information such as the signal quality of the serving cell and the signal quality of the neighboring cell's PCI, or it could be measurement information of the serving cell's beam and the neighboring cell's beam.

[0086] Step 230A: Determine a first target neighbor cell in the neighbor cell list. If the difference between the measurement value of the serving cell and the measurement value of the first target neighbor cell is less than a first threshold, send first control information, which indicates the random access resource configuration corresponding to the first target neighbor cell and / or the cell identification information of the first target neighbor cell.

[0087] When the difference between the information of the serving cell reported by the terminal and the measurement information of the PCI of the neighboring cells in the neighboring cell list is less than a first threshold, the base station sends the first control information to the terminal.

[0088] The first control information is used to trigger the terminal to initiate random access in the serving cell and to obtain the timing advance (TA) of the terminal in the first target neighbor cell. The first control information includes the random access resource configuration of the PCI of the triggered first target neighbor cell, the beam information associated with the random access resource, the transmit power of the random access preamble, and / or the PCI information of the first target neighbor cell.

[0089] Step 240A: Receive the second control information from the first target neighboring cell, obtain the uplink timing advance for the first target neighboring cell from it, and forward the uplink timing advance to the terminal device.

[0090] After sending the first control signaling, the serving cell listens for the second control signaling from the first target neighboring cell within a time window to receive the timing advance information from the first target neighboring cell. The time window starts at the moment after the first duration of the moment when the first control signaling is sent and lasts for N durations.

[0091] Preferably, it further includes at least one step of steps 250A to 270A:

[0092] Step 250A: In response to receiving the uplink timing advance, start the timer; in response to the timer timeout, resend the first control information.

[0093] If the serving cell successfully receives the timing advance, the serving cell starts a timer. During the timer's runtime, the timing advance is valid. After the timer expires, when the difference between the measurement information of the serving cell and the measurement information of the first target neighboring cell is less than a first threshold, the first control information is retransmitted.

[0094] Step 260A: In response to the failure to acquire the uplink timing advance, retransmit the first control information and increase the power of the random access preamble sequence indicated by the first control information.

[0095] If the serving cell fails to receive the timing advance, it sends the first control information to the terminal and increases the power of the random access preamble sequence indicated by the first control information.

[0096] Step 270A: Determine a second target neighbor cell from the set of first target neighbor cells. The difference between the measurement value of the serving cell and the measurement value of the second target neighbor cell is less than a second threshold, and the timing advance is within a valid period. Send the third control information, which instructs the terminal to switch to the second target neighbor cell; the second threshold is less than the first threshold. More preferably, the third control information indicates the uplink timing advance from the terminal to the second neighbor cell.

[0097] Preferably, the third control information instructs random access resources or SRS signals to be sent to the target neighboring cell for updating the timing advance of the target neighboring cell.

[0098] Figure 3 This is a flowchart illustrating an embodiment of the method of this application used in a network-side device of a target neighboring cell.

[0099] The method described in any embodiment of the first aspect of this application, used for a network-side device of a target neighboring cell, includes the following steps 210B to 220B:

[0100] Step 210B: In the first target neighboring cell, receive a random access preamble from the terminal-side device and determine the uplink timing advance of the terminal-side device.

[0101] Step 220B: Send the second control information to the serving cell, including the uplink timing advance.

[0102] Figure 4 This is a flowchart illustrating an embodiment of the method of this application used in a terminal-side device.

[0103] The method described in any embodiment of the first aspect of this application, used in a terminal-side device, includes the following steps 310-360: The terminal receives configuration information, which at least indicates a neighboring cell PCI list and associated beam information; the terminal measures and reports measurement information to trigger the serving cell to send first control information; the terminal receives the first control information and sends uplink random access to the neighboring cell on the indicated random access resources to obtain the uplink timing advance of the neighboring cell; the terminal receives second control information from the serving cell, indicating the uplink timing advance of the neighboring cell, for the terminal to perform a physical layer handover to the target neighboring cell.

[0104] Step 310: Receive configuration information, which includes the physical cell identifier (PCI) of the neighboring cell and the associated beam information.

[0105] The configuration information indicates the random access resource configuration of neighboring cells, as well as the beam information associated with the random access resources.

[0106] Step 320: Send measurement information, which includes the measurement values ​​of the serving cell and neighboring cells in the neighboring cell list.

[0107] The measurement information is either the measurement information of the serving cell and the measurement information of the neighboring cell's PCI, or the measurement information of the serving cell's beam and the neighboring cell's beam.

[0108] Step 330: Receive first control information from the serving cell, wherein the information indicates random access resource configuration corresponding to at least one first target neighbor cell.

[0109] When the difference between the information of the serving cell reported by the terminal and the measurement information of the neighboring cell's PCI exceeds a first threshold, the base station sends first control information to the terminal. The first control information is used by the serving cell to trigger the terminal to initiate random access and by the neighboring cell to obtain the terminal's timing advance (TA). The first control information includes the random access resource configuration of the triggered neighboring cell's PCI, the beam information associated with the random access resources, and the transmit power of the random access preamble.

[0110] Step 340: Send the corresponding random access preamble to the first target neighboring cell.

[0111] Step 350: Receive third control information from the serving cell and obtain the uplink timing advance for the second target neighboring cell.

[0112] Preferably, it further comprises:

[0113] Step 360: Receive third control information from the serving cell, wherein the terminal device is instructed to switch from the serving cell to the second target neighboring cell.

[0114] When the difference between the information of the serving cell reported by the terminal and the measurement information of the PCI of the neighboring cell exceeds the second threshold, and the timing advance is within the valid period, the serving cell sends the third control information to the terminal, wherein the value of the second threshold is less than the first threshold.

[0115] The third control information instructs the terminal to switch from the serving cell to the second target neighboring cell. After receiving the third control information, the terminal sends uplink signals and receives downlink signals to the second target neighboring cell, including a common channel and a terminal-dedicated channel.

[0116] Figure 5 This is a schematic diagram of an embodiment of a network-side device.

[0117] This application also proposes a network-side device for implementing the method of any embodiment of this application. In one embodiment of this application, at least one module of the network-side device is configured to perform at least one of the following functions: receiving the measurement information; determining a first target neighbor cell in a neighbor cell list, wherein the difference between the measurement value of the serving cell and the measurement value of the first target neighbor cell is less than a first threshold; sending the first control information; receiving the second control information; determining the uplink timing advance of the first target neighbor cell based on the second control information; starting a timer; retransmitting the first control information in response to a timer timeout; retransmitting the first control information and increasing the power of the random access preamble sequence indicated by the first control information in response to a failure to obtain the uplink timing advance; determining a second target neighbor cell in the set of the first target neighbor cells, wherein the difference between the measurement value of the serving cell and the measurement value of the second target neighbor cell is less than a second threshold.

[0118] In another embodiment of this application, at least one module in the network-side device is used for at least one of the following functions: receiving the random access preamble; determining the uplink timing advance; and sending the second control information.

[0119] To implement the above technical solution, this application proposes a network-side device 400, which includes a network transmitting module 401, a network determining module 402, and a network receiving module 403 that are interconnected.

[0120] The network transmission module is used to transmit the first control information and the third control information. In the preferred embodiment of this application, in response to a timer timeout, the first control information is retransmitted; in response to a failure to obtain the uplink timing advance, the first control information is retransmitted and the power of the random access preamble sequence indicated by the first control information is increased.

[0121] The network determination module is used to determine a first target neighbor cell from the neighbor cell list, wherein the difference between the measurement value of the serving cell and the measurement value of the first target neighbor cell is less than a first threshold; and to determine a second target neighbor cell from the set of the first target neighbor cells, wherein the difference between the measurement value of the serving cell and the measurement value of the second target neighbor cell is less than a second threshold.

[0122] The network receiving module is used to receive the measurement information and the second control information.

[0123] The specific methods for implementing the functions of the network sending module, network determining module, and network receiving module are as described in the various method embodiments of this application, and will not be repeated here.

[0124] In another embodiment of the network-side device described herein, the network testing device is used for a first target neighbor cell or a second target neighbor cell; the network determination module is used to receive the random access preamble; the network determination module is used to determine the uplink timing advance; and the network transmission module is used to transmit the second control information, which includes the uplink timing advance.

[0125] The network-side equipment described in this application may refer to base station facilities, network-side equipment or servers connected to base stations, systems that provide services for the aforementioned equipment, or any system, subsystem, module, circuit, chip or software operating device that provides information reception, transmission, identification and processing for the aforementioned equipment.

[0126] Figure 6 This is a schematic diagram of an embodiment of the terminal-side device.

[0127] This application also proposes a terminal-side device for implementing the method of any embodiment of this application. At least one module in the terminal-side device is configured to perform at least one of the following functions: determining the measurement information; sending the measurement information, receiving the first control information, the second control information, and the third control information; determining the random access preamble of the first target neighboring cell; sending the random access preamble; determining the uplink timing advance of the second target neighboring cell based on the third control information; and determining indication information for handover from the serving cell to the second target neighboring cell based on the third control information.

[0128] To implement the above technical solution, this application proposes a terminal-side device 500, which includes a terminal transmitting module 501, a terminal determining module 502, and a terminal receiving module 503 that are interconnected.

[0129] The terminal receiving module is used to receive the first control information, the second control information, and the third control information.

[0130] The terminal determination module is used to determine the measurement information; determine the random access resources of the first target neighbor cell according to the configuration information and the first control information; determine the uplink timing advance of the second target neighbor cell according to the received third control information; and determine the indication information for handover from the serving cell to the second target neighbor cell according to the low three control information.

[0131] The terminal sending module is used to send the measurement information and send the random access preamble to the first target neighboring cell.

[0132] The specific methods for implementing the functions of the terminal sending module, the terminal determining module, and the terminal receiving module are as described in the various method embodiments of this application, and will not be repeated here.

[0133] The terminal-side equipment described in this application may refer to user equipment (UE), personal mobile terminal, smart terminal, mobile phone, computer with communication function, system providing services for the above-mentioned equipment, or any system, subsystem, module, circuit, chip or software running device that provides information reception, transmission, identification and processing for the above-mentioned equipment.

[0134] Figure 7 A schematic diagram of a network-side device according to another embodiment of the present invention is shown. As shown, the network-side device 600 includes a processor 601, a wireless interface 602, and a memory 603. The wireless interface may consist of multiple components, including a transmitter and a receiver, providing a unit for communication with various other devices over a transmission medium. The wireless interface implements communication functions with the terminal-side device, processes wireless signals through receiving and transmitting devices, and the data carried by the signals is communicated with the memory or processor via an internal bus structure. The memory 603 contains a computer program that executes any embodiment of this application, and the computer program runs or modifies the processor 601. When the memory, processor, and wireless interface circuit are connected through a bus system, the bus system includes a data bus, a power bus, a control bus, and a status signal bus, which will not be described in detail here.

[0135] Figure 8 This is a block diagram of a terminal-side device according to another embodiment of the present invention. The terminal-side device 700 includes at least one processor 701, a memory 702, a user interface 703, and at least one network interface 704. The various components in the terminal-side device 700 are coupled together via a bus system. The bus system is used to implement communication between these components. The bus system includes a data bus, a power bus, a control bus, and a status signal bus.

[0136] User interface 703 may include a display, keyboard, or clicking device, such as a mouse, trackball, touchpad, or touchscreen.

[0137] The memory 702 stores executable modules or data structures. The memory may store an operating system and application programs. The operating system includes various system programs, such as a framework layer, core library layer, and driver layer, used to implement various basic business functions and handle hardware-based tasks. The application programs include various applications, such as media players and browsers, used to implement various application functions.

[0138] In an embodiment of the present invention, the memory 702 contains a computer program that executes any embodiment of the present application, the computer program being run on or modified by the processor 701.

[0139] The memory 702 includes a computer-readable storage medium. The processor 701 reads the information in the memory 702 and, in conjunction with its hardware, completes the steps of the above-described method. Specifically, the computer-readable storage medium stores a computer program, which, when executed by the processor 701, implements the steps of the method embodiments described in any of the above embodiments.

[0140] The processor 701 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the method in this application can be completed by the integrated logic circuitry in the hardware of the processor 701 or by instructions in software form. The processor 701 may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a readily available programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this invention can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor.

[0141] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. In a typical configuration, the device of this application includes one or more processors (CPUs), an input / output user interface, a network interface, and memory.

[0142] Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0143] Therefore, this application also proposes a computer-readable medium storing a computer program that, when executed by a processor, implements the steps of the method described in any embodiment of this application. For example, the memory 603, 702 of the present invention may include non-permanent memory in the form of computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM.

[0144] Based on the embodiments of the above-described apparatus in this application, this application also proposes a mobile communication system, including at least one embodiment of any terminal-side device in this application and / or at least one embodiment of any network-side device in this application.

[0145] It should be noted that the specific mobile communication technology described in this invention is not limited, and can be WCDMA, CDMA2000, TD-SCDMA, WiMAX, LTE / LTE-A, LAA, MuLTEfire, and subsequent fifth-generation, sixth-generation, and Nth-generation mobile communication technologies.

[0146] The terminal described in this invention refers to a terminal-side product that can support the communication protocols of terrestrial mobile communication systems, and a specially designed wireless modem module that can be integrated into various types of terminal forms such as mobile phones, tablets, and data cards to complete communication functions.

[0147] For ease of description, the mobile communication terminal can be referred to as UE (User Equipment), and the network-side access equipment can be referred to as a base station or access point.

[0148] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0149] It should also be noted that the terms "first", "second", etc. in this application are used to distinguish multiple objects with the same name, and unless otherwise specified, they have no meaning of order or size.

[0150] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for physical layer mobility handover, used in a terminal-side device, characterized in that, Includes the following steps: Send measurement information, which includes measurement values ​​of the serving cell and neighboring cells in the neighboring cell list; Receive configuration information, which includes the physical cell identifier (PCI) of neighboring cells and associated beam information; The terminal receives first control information from the serving cell, which indicates the random access resource configuration corresponding to at least one first target neighbor cell; the first control information includes the PCI of the first target neighbor cell, and the terminal learns the resource location for initiating random access to the first target neighbor cell based on the PCI; the first control information also includes a PRACH mask index field, indicating the available PRACH resource location. Send the corresponding random access preamble to the first target neighboring cell; Receive third control information from the serving cell, and obtain from it the uplink timing advance for the second target neighbor cell and / or indication information for handover from the serving cell to the second target neighbor cell; The third control information is further used to trigger the terminal-side device to send an SRS or random access signal to the second target neighbor cell using the acquired uplink timing advance, so that the second target neighbor cell can update the uplink timing advance.

2. The physical layer mobility handover method as described in claim 1, characterized in that, The first control information includes cell identifiers of one or more first target neighboring cells, and the third control information includes cell identifiers of second target neighboring cells.

3. The physical layer mobility handover method as described in claim 1, characterized in that, The configuration information is indicated in at least one of the following ways: Method 1: The serving cell configures a PCI list for the terminal, indicating the TCI status of each list; Method 2: The serving cell configures the PCI list and associated beam information to the terminal. In the TCI state configuration indicated by the serving cell, the neighbor cell PCI configuration information additionalPCI is added to indicate that this TCI state refers to the beam information of the neighbor cell.

4. A method for physical layer mobility handover, used in network-side equipment, characterized in that, Includes the following steps: Receive measurement information, which includes measurement values ​​of the serving cell and neighboring cells in the neighboring cell list; Send configuration information, which includes the physical cell identifier (PCI) of neighboring cells in the neighbor cell list and the associated beam information; If the difference between the measured value of the serving cell and the measured value of the first target neighbor cell is less than a first threshold, first control information is sent, wherein the random access resource configuration corresponding to the first target neighbor cell is indicated; Receive second control information from one or more of the first target neighboring cells, and obtain uplink timing advance for the first target neighboring cells from it; In response to receiving the uplink timing advance, start the timer; After sending the first control signaling, the serving cell listens for the second control signaling from the first target neighboring cell within a time window to receive the timing advance information from the first target neighboring cell. The time window starts at a time after the first duration of the time when the first control signaling is sent and lasts for N durations. Send third control information to the terminal device, forward the uplink timing advance of the second target neighboring cell and / or instruct the terminal device to switch from the serving cell to the second target neighboring cell; the second target neighboring cell is one of the first target neighboring cell set; The step of sending the third control information to the terminal device is performed when the timer has not expired and the difference between the measurement value of the serving cell and the measurement value of the second target neighboring cell is less than a second threshold, wherein the second threshold is less than the first threshold.

5. The physical layer mobility handover method as described in claim 4, used in a network device, characterized in that, Includes the following steps: In response to a timer timeout, the first control information is resent.

6. The physical layer mobility handover method as described in claim 4, used in a network device, characterized in that, Includes the following steps: In response to the failure to acquire the uplink timing advance, the first control information is retransmitted and the power of the random access preamble sequence indicated by the first control information is increased.

7. The physical layer mobility handover method as described in claim 4, used in a network device, characterized in that, Includes the following steps: If the difference between the measured value of the serving cell and the measured value of the second target neighboring cell is less than a second threshold, the third control information is sent, which is used to instruct the terminal to switch to the second target neighboring cell; The second threshold is less than the first threshold.

8. The physical layer mobility handover method as described in claim 7, characterized in that, The third control information instructs the terminal device to switch from the serving cell to the second target neighboring cell and / or instructs the uplink timing advance of the second target neighboring cell.

9. A method for physical layer mobility handover, used in network-side equipment, characterized in that, Includes the following steps: In the first target neighboring cell, a random access preamble is received from the terminal-side device. The random access preamble is sent by the terminal-side device according to the random access resource configuration indicated by the first control information sent by the serving cell. Receive C-RNTI from the terminal-side device and identify the terminal-side device; Determine the uplink timing advance of the terminal-side device; Send a second control message to the serving cell, which includes the uplink timing advance.

10. A terminal-side device for implementing the method according to any one of claims 1 to 3, characterized in that, At least one module in the terminal-side device is configured to perform at least one of the following functions: determine the measurement information; send the measurement information and receive the first control information; determine the random access preamble of the first target neighboring cell; send the random access preamble; and determine the uplink timing advance of the second target neighboring cell and / or the indication information for switching from the serving cell to the second target neighboring cell based on the third control information.

11. A network-side device for implementing the method according to any one of claims 4 to 8, characterized in that, At least one module in the network-side device is configured to perform at least one of the following functions: receiving the measurement information; determining that the difference between the measurement value of the serving cell and the measurement value of the first target neighboring cell is less than a first threshold; sending the first control information; and receiving the second control information. The uplink timing advance of the first target neighboring cell is determined based on the second control information; Start the timer; In response to a timer timeout, the first control information is retransmitted; in response to a failure to acquire the uplink timing advance, the first control information is retransmitted and the power of the random access preamble sequence indicated by the first control information is increased. A second target neighbor cell is determined from the set of first target neighbor cells, where the difference between the measurement value of the serving cell and the measurement value of the second target neighbor cell is less than a second threshold; Send the third control information.

12. A network-side device for implementing the method of claim 9, characterized in that, At least one module in the network-side device is used for at least one of the following functions: receiving the random access preamble; determining the uplink timing advance; and sending the second control information.

13. A communication device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the method as described in any one of claims 1 to 9.

14. A computer-readable medium storing a computer program that, when executed by a processor, implements the steps of the method as described in any one of claims 1 to 9.

15. A mobile communication system, characterized in that, It includes at least one terminal-side device as described in claim 10, at least one network-side device as described in claim 11, and at least one network-side device as described in claim 12.

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