CN112291842A

CN112291842A - Communication method and device

Info

Publication number: CN112291842A
Application number: CN201910661809.1A
Authority: CN
Inventors: 何青春; 娄崇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2021-01-29
Also published as: WO2021012822A1

Abstract

The application relates to the technical field of communication, and discloses a communication method and a communication device, which are used for solving the problem of how to determine timing advance TA by terminal equipment to improve the reliability of uplink data transmission when two-step random access is performed. The method comprises the following steps: the method comprises the steps that terminal equipment receives configuration information, wherein the configuration information comprises a mapping relation between a downlink measurement value and a TA; the terminal equipment obtains a downlink measurement value; and the terminal equipment determines a target TA according to the obtained downlink measurement value.

Description

Communication method and device

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a communication method and device.

Background

Random Access (RA), also called Random Access Channel (RACH). In a Long Term Evolution (LTE) system, a New Radio (NR) system, and the like, a terminal device needs to enter an RRC connection state from a Radio Resource Control (RRC) idle state or an inactive state through random access, so as to establish various bearers with a network device, and further communicate with the network device. At present, a random access of a terminal device generally employs a four-step random access (4-step RACH), where the four-step random access includes that the terminal device sends a random access preamble (preamble) to a network device, the network device sends a Random Access Response (RAR) to the terminal device, the terminal device sends uplink data to the network device, and the network device sends collision resolution information (CRM) to the terminal device. In order to support random access in a low-delay scene or reduce the monitoring times of an unauthorized carrier in NR, two-Step random access (2-Step RACH) is provided, in which only a terminal device sends a random access request including a random access preamble and uplink data to a network device, and the network device sends a random access response which can be used for random access response and collision resolution to the terminal device.

However, unlike the four-step random access, the network device estimates a Timing Advance (TA) according to the random access preamble sent by the terminal device, and indicates the estimated TA to the terminal device through a random access response, and the terminal device sends uplink data according to the TA.

Disclosure of Invention

Embodiments of the present application provide a communication method and apparatus, so as to solve a problem how a terminal device determines a TA to improve reliability of uplink data transmission when two steps of random access are performed.

In a first aspect, an embodiment of the present application provides a communication method, where the method includes: the communication equipment receives configuration information, wherein the configuration information comprises a mapping relation between a downlink measurement value and a TA; the communication equipment obtains a downlink measurement value; and the communication equipment determines a target TA according to the obtained downlink measurement value and the mapping relation between the downlink measurement value and the TA.

The communication device described in the embodiment of the present application may be a terminal device or a processing chip in the terminal device. By adopting the method, the terminal equipment can determine the target TA according to the obtained downlink measurement value through the mapping relation between the downlink measurement value and the TA included in the configuration information, and the target TA is used for sending the uplink data when the terminal equipment is randomly accessed in two steps so as to improve the reliability of the uplink data transmission.

In a possible design, if the configuration information further includes a mapping relationship between a downlink measurement value and a timing advance offset TA _ offset, after the communication device determines the target TA, the communication device may further determine the target TA _ offset according to the obtained downlink measurement value and the mapping relationship between the downlink measurement value and the TA _ offset; the communication device adjusts the target TA according to the target TA _ offset. In the above design, a mapping relationship between the downlink measurement value and TA _ offset is also introduced into the configuration information, so that the terminal device can further obtain the target TA _ offset according to the obtained downlink measurement value, and perform optimal adjustment on the determined target TA by using the target TA _ offset, which is beneficial to improving the reliability of uplink data transmission.

In a possible design, if the configuration information further includes a mapping relationship between the number of random access request retransmissions and a timing advance increment step TA _ mapping step, the communication device may further obtain the number of random access retransmissions after determining a target TA; the communication equipment determines a target TA _ Rampingstep according to the obtained random access retransmission times; and the communication equipment adjusts the target TA according to the target TA _ Rampingstep. In the above design, a mapping relationship between the retransmission times of the random access request and TA _ mapping step is also introduced into the configuration information, and when the terminal device retransmits or repeatedly sends the random access request, the target TA determined according to the downlink measurement value is adjusted according to the mapping relationship between the retransmission times of the random access request and TA _ mapping step, which is beneficial to improving the reliability of uplink data transmission.

In one possible design, the downlink measurements may include one or more of the following: reference signal received power, RSRP; or, reference signal received quality, RSRQ; or, the signal-to-interference-and-noise ratio SINR of the reference signal; or, downlink path loss. In the design, the realization of the downlink measurement value is enriched, and the corresponding downlink measurement value is convenient to select according to the communication system and the communication requirement.

In one possible design, the method further includes: and the communication equipment sends a random access request according to the target TA, wherein the random access request comprises a random access preamble and uplink data. In the above design, the terminal device sends the random access request including the random access preamble and the uplink data according to the target TA determined by the received configuration information, so that the reliability of uplink data transmission can be better ensured.

In one possible design, the method further includes: the communication device receives a random access response; and the communication equipment starts or restarts the DRX-inactive timer when successfully analyzing the temporary cell radio network temporary identification data unit TC-RNTI SDU in the random response. In the above design, the terminal device can monitor the PDCCH conveniently, and receive the downlink control information is ensured.

In one possible design, the discontinuous reception, C-DRX, active period of the communication device includes a random access acknowledgement reception window. In the above design, it is convenient for the terminal device to receive the random access response.

In one possible design, the communication device monitors a physical downlink control channel PDCCH if the random access response reception window overlaps with a measurement GAP of the communication device. In the design, omission of the random access response by the terminal equipment is avoided, and the random access response is received by the terminal equipment.

In one possible design, the method further includes: and the communication equipment switches the random access type of the application when determining that the random access type of the current application meets the switching condition. The design is convenient for the terminal equipment to select the optimal random access type for random access so as to ensure the reliability of the random access.

In one possible design, the communication device may determine that the currently applied random access type satisfies the handover condition when at least one of the following conditions is satisfied: the number of times that the communication equipment initiates the random access request on the currently applied random access type is greater than a first threshold value; the communication device switches to a beam and/or bandwidth and/or carrier that is not in accordance with the currently applied random access type; the communication equipment initiates a random access request on the currently applied random access type, and the continuous failure times are greater than a second threshold value; the communication device determines that the downlink measurement value is greater than a third threshold or less than a fourth threshold. The design can enrich the realization of the random access type switching condition, and is convenient for selecting the corresponding random access type switching condition according to the communication system and the communication requirement.

In one possible design, the communication device may further initialize random access parameters, where the random access parameters include one or more of a number of times of initiating a random access request, a number of power ramps, a physical uplink shared channel payload PUSCH payload buffer, and a Msg3 buffer. By the design, when the random access type is switched, the random access parameter is initialized, so that the problem of unnecessary random access failure can be avoided.

In a second aspect, an embodiment of the present application provides a communication method, where the method includes: the network equipment sends configuration information, wherein the configuration information comprises a mapping relation between a downlink measurement value and a Timing Advance (TA). By adopting the method, the terminal equipment can be instructed to determine the target TA according to the obtained downlink measurement value through the mapping relation between the downlink measurement value and the TA included in the configuration information, and the target TA is used for sending the uplink data when the terminal equipment is randomly accessed in two steps so as to improve the reliability of the uplink data transmission.

In one possible design, the configuration information may further include: and mapping relation between the downlink measurement value and TA _ offset. In the above design, a mapping relationship between the downlink measurement value and TA _ offset is also introduced into the configuration information, so that the terminal device can further obtain the target TA _ offset according to the obtained downlink measurement value, and perform optimal adjustment on the determined target TA by using the target TA _ offset, which is beneficial to improving the reliability of uplink data transmission.

In one possible design, the configuration information may further include: and the random access request retransmission times and TA _ Rampingstep. In the above design, a mapping relationship between the retransmission times of the random access request and TA _ mapping step is also introduced into the configuration information, and when the terminal device retransmits or repeatedly sends the random access request, the target TA determined according to the downlink measurement value is optimally adjusted according to the mapping relationship between the retransmission times of the random access request and TA _ mapping step, which is beneficial to improving the reliability of uplink data transmission.

In a third aspect, an embodiment of the present application provides a communication apparatus, where the apparatus has a function of implementing the method in the first aspect or any one of the possible designs of the first aspect, where the function may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In one possible design, the device may be a chip or an integrated circuit.

In one possible design, the apparatus includes a memory and a processor, the memory is used for storing a program executed by the processor, and when the program is executed by the processor, the apparatus may perform the functions of the method described in the first aspect or any one of the possible designs of the first aspect.

In one possible design, the apparatus may be a terminal device.

In a fourth aspect, the present application provides a communication apparatus having a function of implementing the method in the second aspect or any possible design of the second aspect, where the function may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

In one possible design, the device may be a chip or an integrated circuit.

In one possible design, the apparatus includes a memory and a processor, the memory is used for storing a program executed by the processor, and when the program is executed by the processor, the apparatus may perform the functions of the method described in the second aspect or any one of the possible designs of the second aspect.

In one possible design, the apparatus may be a network device.

In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores computer instructions that, when executed, implement the method described in the first aspect or any one of the possible designs of the first aspect, or implement the method described in the second aspect or any one of the possible designs of the second aspect.

In a sixth aspect, the present application further provides a computer program product, which includes a computer program or instructions, and when the computer program or instructions are executed, the method described in the first aspect or any one of the possible designs of the first aspect or the second aspect is implemented, or the method described in the second aspect or any one of the possible designs of the second aspect is implemented.

Drawings

Fig. 1 is a schematic diagram of a communication architecture according to an embodiment of the present application;

fig. 2A and fig. 2B are schematic diagrams illustrating uplink time adjustment in the embodiment of the present application;

fig. 3 is a diagram illustrating a four-step random access procedure in an embodiment of the present application;

fig. 4 is a schematic diagram of a two-step random access procedure in an embodiment of the present application;

fig. 5 is a schematic diagram of a communication process according to an embodiment of the present application;

fig. 6 is a second schematic diagram of a communication process according to an embodiment of the present application;

fig. 7 is a third schematic diagram of a communication process according to an embodiment of the present application;

fig. 8 is a fourth schematic view of a communication process provided in the embodiment of the present application;

fig. 9 is a schematic block diagram of a terminal device provided in an embodiment of the present application;

fig. 10 is another schematic block diagram of a terminal device provided in an embodiment of the present application;

fig. 11 is a schematic block diagram of a network device provided in an embodiment of the present application;

fig. 12 is another schematic block diagram of a network device provided by an embodiment of the present application;

fig. 13 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 14 is a schematic block diagram of a communication device provided in an embodiment of the present application;

fig. 15 is another schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 16 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: the present invention may also be extended to related cellular systems such as wireless fidelity (WiFi), worldwide interoperability for microwave access (wimax), and 3GPP, and future communication systems such as 6G systems, in communication systems such as a 5G system, an NR system, an LTE system, and a long term evolution-advanced (LTE-a) system. Specifically, a communication system architecture applied in the embodiment of the present application may be as shown in fig. 1, and includes a network device and a plurality of terminal devices, and three terminal devices are taken as an example in fig. 1. The terminal devices 1 to 3 may communicate with the network device separately or simultaneously, and it should be noted that in this embodiment of the application, the number of the terminal devices and the network devices in the communication system shown in fig. 1 is not limited.

In addition, it should be understood that in the embodiments of the present application, the word "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term using examples is intended to present concepts in a concrete fashion.

The terms "comprising" and "having" in the description of the embodiments and claims of the present application and the drawings are not intended to be exclusive. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to only those steps or modules listed, but may include other steps or modules not listed. The terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship. It should be understood that in the embodiment of the present application, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information. And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects. Reference to "a plurality" in this application is two or more.

In addition, in the embodiments of the present application, information (information), signal (signal), message (message), and channel (channel) may be mixed, and it should be noted that when the difference is not emphasized, the intended meaning is consistent. "of", "corresponding", and "corresponding" may sometimes be used in combination, it being noted that the intended meaning is consistent when no distinction is made.

Before describing the embodiments of the present application, some terms in the present application will be explained to facilitate understanding for those skilled in the art.

1) Terminal devices, including devices that provide voice and/or data connectivity to a user, may include, for example, handheld devices having wireless connection capabilities or processing devices connected to wireless modems. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchanging voice and/or data with the RAN. The terminal device may include a User Equipment (UE), a wireless terminal device, a mobile terminal device, a device-to-device communication (D2D) terminal device, a V2X terminal device, a machine-to-machine/machine-type communication (M2M/MTC) terminal device, an internet of things (IoT) terminal device, a subscriber unit (subscriber unit), a subscriber station (subscriber state), a mobile station (mobile state), a remote station (remote state), an access point (access point, AP), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), or a user equipment (user device), etc. For example, mobile telephones (or so-called "cellular" telephones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included mobile devices, and the like may be included. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, Radio Frequency Identification (RFID), sensors, Global Positioning Systems (GPS), laser scanners, and the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable smart device or intelligent wearable equipment etc. is the general term of using wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.

The various terminal devices described above, if located on a vehicle (e.g., placed in or installed in the vehicle), may be considered to be vehicle-mounted terminal devices, which are also referred to as on-board units (OBUs), for example.

In this embodiment, the terminal device may further include a relay (relay). Or, it is understood that any device capable of data communication with a base station may be considered a terminal device.

2) A network device may refer to a device in an access network that communicates over the air with a wireless terminal device through one or more cells. The network device may be a node in a radio access network, which may also be referred to as a base station, and may also be referred to as a Radio Access Network (RAN) node (or device). Currently, some examples of network devices are: a gbb, a Transmission Reception Point (TRP), an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved Node B, or home Node B, HNB), a Base Band Unit (BBU), or a wireless fidelity (Wifi) Access Point (AP), etc. In addition, in a network structure, the network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node. The structure separates the protocol layers of the eNB in a Long Term Evolution (LTE) system, the functions of part of the protocol layers are controlled in the CU in a centralized way, the functions of the rest part or all of the protocol layers are distributed in the DU, and the CU controls the DU in a centralized way.

3) And adjusting uplink time.

As shown in fig. 2A, due to signal propagation between the network device and the terminal deviceDelay, interval of DeltaT from the starting time of sending down signal by network equipment to the starting time of receiving down signal by terminal equipment 1₁＝d₁C, wherein d₁Which is the distance between the network device and the terminal device 1, c is the signal propagation speed. For wireless communication, c is the speed of light. Similarly, Δ T₂＝d₂C, wherein d₂Is the distance between the network device and the terminal device 2. If the terminal device 1 does not perform uplink timing adjustment, the uplink signal is transmitted to the network device with reference to the starting time of receiving the downlink signal, and the interval from the starting time of transmitting the uplink signal by the terminal device 1 to the starting time of receiving the uplink signal by the network device is also delta T₁. Therefore, for the terminal device 1, there is 2 Δ T from the start time of transmitting the downlink signal to the start time of receiving the uplink signal in the network device₁Similarly, for the terminal device 2, there is a 2 Δ T from the starting time of sending the downlink signal to the starting time of receiving the uplink signal in the network device₂The time difference of (a). Due to different distances between each terminal device and the network device, the time for the uplink signal to reach the network device is different, and thus timing deviation may exist between the terminal devices. When the timing deviation is larger than a Cyclic Prefix (CP) of an Orthogonal Frequency Division Multiplexing (OFDM) symbol, the terminal devices may interfere with each other.

In order to solve the problem of interference between terminal devices, the terminal devices need to perform timing adjustment, also referred to as timing advance, TA. As shown in fig. 2B, the terminal device 1 advances the start time of transmitting the uplink signal by 2 Δ T₁The terminal device 2 advances the start time of transmitting the uplink signal by 2 Δ T₂Then, the network device will receive the uplink signals of the terminal device 1 and the terminal device 2 at the same time, thereby solving the problem of mutual interference between the terminal devices. In the random access process, the network device sends a TA to the terminal device in a random access response, and the terminal device performs timing adjustment according to the TA. When the distance between the terminal device and the network device changes, timing adjustment needs to be performed correspondingly. For four-step random access, the terminal equipment sendsWhen sending uplink signals, timing adjustment is carried out according to TA fed back by the network equipment in the random access response, so that interference between terminal equipment does not exist under normal conditions.

4) Random Access (RA) which is divided into four-step random access and two-step random access. Referring to fig. 3, step one: the terminal device sends a random access preamble (Msg1) to the network device; step two: after receiving the random access preamble, the network device sends a random access response (Msg2) to the terminal device, where the random access response may include parameters such as the random access preamble, a TA, configuration information of an uplink resource for sending uplink data, and a temporary cell radio network temporary identifier (C-RNTI); step three: the terminal equipment receives a random access response, if the random access preamble indicated by the sequence number of the random access preamble in the random access response is the same as the random access preamble sent by the terminal equipment to the network equipment in the step one, the terminal equipment determines that the random access response is specific to the terminal equipment, and the terminal equipment sends uplink data (Msg3) to the network equipment according to the indication of the random access response, and if the uplink data are sent to the network equipment according to the indicated TA; step four: the network equipment receives uplink data sent by the terminal equipment and sends a conflict resolution message (Msg4) to the terminal equipment, the network equipment carries a unique terminal equipment identification in the conflict resolution message to designate the terminal equipment which is successfully accessed, and other terminal equipment which is not successfully accessed reinitiates random access.

Referring to fig. 4, a schematic diagram of a two-step random access procedure is shown, wherein the first step is: the terminal device sends a message A (MsgA) to the network device, namely a random access request is sent to the network device, wherein the MsgA comprises a random access preamble and uplink data and is equivalent to Msg1 and Msg3 in the four-step random access process; after receiving the MsgA sent by the terminal device, the network device sends a message b (MsgB) to the terminal device, that is, sends a random access response to the terminal device, and the MsgB can be used to send a random access response and conflict resolution, which is equivalent to Msg2 and Msg4 of four-step random access.

And for the terminal equipment with the four-step random access in an idle state or an inactive state to enter an RRC (radio resource control) connection state, the terminal equipment needs to complete signaling interaction at least four times when communicating with the network equipment. For services such as highly reliable and low latency communications (URLLC), enhanced mobile broadband (eMBB), etc., four times of signaling interaction will generate a higher latency, which is not favorable for requirements of URLLC and eMBB for low latency. For large-scale machine communication (mtc) services, since most of the services are sporadic packets, a terminal device needs to perform a four-step random access completely each time to enter an RRC connected state to send data once, and then returns to an idle state or an inactive state again, which not only has a high time delay, but also has a relatively high signaling overhead. And the signaling interaction times required by the two-step random access are reduced, the signaling overhead is reduced, the time delay is also reduced, and the method is suitable for application scenes with low time delay requirements.

However, different from the four-step random access, the network device estimates a TA according to the random access preamble sent by the terminal device, and indicates the estimated TA to the terminal device through a random access response, and the terminal device sends uplink data according to the TA. The method and the device aim to solve the problem of how to determine the TA by the terminal equipment to improve the reliability of uplink data transmission when two-step random access is performed.

The following describes embodiments of the present application in detail with reference to the drawings.

[ EXAMPLES one ]

Fig. 5 is a schematic diagram of a communication process provided in an embodiment of the present application, where the process includes:

s501: the network equipment sends configuration information, and the terminal equipment receives the configuration information, wherein the configuration information comprises a mapping relation between a downlink measurement value and a TA.

The downlink measurement value may be a measurement value of a downlink signal or a channel between the terminal device and the network device.

Along with the increase of the distance between the terminal device and the network device, the quality of the downlink signal of the network device received by the terminal device shows a decreasing trend, such as the power, the signal-to-interference-and-noise ratio, and the like of the downlink signal are decreased, and the path loss is increased. In this embodiment, a mapping relationship between a downlink measurement value and a TA is pre-configured in the network device, where the mapping relationship between the downlink measurement value and the TA may be configured according to a downlink measurement value and a corresponding TA between the terminal device and the network device at a different distance from the network device. The downlink measurement value includes, but is not limited to, one or more of Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), reference signal to interference noise ratio (SINR), or downlink loss.

As an example, the configuration information may be sent via a broadcast or multicast message, or via a Radio Resource Control (RRC) message dedicated to the terminal device, or other RRC configuration message.

In another possible implementation, the configuration information may also be pre-stored in the terminal device by means of protocol definition or the like.

It should be understood that when the downlink measurement value is only one of RSRP, RSRQ, SINR, or downlink path loss, as the RSRP, RSRQ, or SINR decreases, the TA corresponding to the RSRP, RSRQ, or SINR determined according to the mapping relationship of the downlink measurement value and TA increases; and along with the increase of the downlink path loss, the determined TA corresponding to the downlink path loss increases according to the mapping relation between the downlink measurement value and the TA.

When the downlink measurement value is multiple of RSRP, RSRQ, SINR or downlink path loss and the like, the TA corresponding to the RSRP, the RSRQ or the SINR is determined to be increased according to the mapping relation between the downlink measurement value and the TA as one or more of the RSRP, the RSRQ or the SINR is decreased; and along with the increase of the downlink path loss, the determined TA corresponding to the downlink path loss increases according to the mapping relation between the downlink measurement value and the TA.

For example, the mapping relationship between the downlink measurement value and the TA may be expressed as a mapping equation between the downlink measurement value and the TA, or may be expressed as a mapping table between the downlink measurement value and the TA, or the like, as long as the mapping relationship between the downlink measurement value and the TA can be clearly expressed.

Taking the downlink measurement value as RSRP as an example, the mapping relation between the downlink measurement value and TA may be TA ═ K × RSRP + C, where K and C are parameters configured according to RSRP and the corresponding TA between the terminal device and the network device at different distances from the network device.

Still taking the downlink measurement value as RSRP as an example, the mapping relationship table of the downlink measurement value and TA may be as follows:

TABLE 1

As shown in table 1, three TA groups (TAGs), namely TAG1, TAG2, and TAG3, are configured in the network device according to the downlink measurement values of the terminal device and the network device, and respectively correspond to a near point zone where the terminal device is located away from the network device, a middle point zone where the terminal device is located away from the network device, and a far point zone where the terminal device is located away from the network device. In addition, it is to be understood that the downlink measurement A in Table 1 above is₁、A₂… B1, B2 … C1, and C2 … may be specific downlink measurement values, or downlink measurement value intervals that do not overlap with each other.

In addition, if the downlink measurement value includes multiple RSRP, RSRQ, SINR, or downlink loss, for example, the downlink measurement value includes RSRP, RSRQ, SINR, and downlink loss, the mapping relation between the downlink measurement value and TA may be TA ═ M × RSRP + N × RSRQ + O × SINR + P × XXLS + R, where XXLS is downlink loss, and M, N, O, P, R is a parameter configured according to RSRP, RSRQ, SINR, downlink loss between the terminal device and the network device at a different distance from the network device, and the corresponding TA. If the mapping relation between the downlink measurement value and the TA exists in the form of a mapping relation table between the downlink measurement value and the TA, the TA which has mapping relation with each group of possible RSRP, RSRQ, SINR and downlink path loss is recorded in the mapping relation table between the downlink measurement value and the TA.

In addition, the configuration information may further include Physical Random Access Channel (PRACH) time-frequency resources configured for random access, a random access preamble, and Physical Uplink Shared Channel (PUSCH) time-frequency resources.

S502: and the terminal equipment obtains a downlink measurement value with the network equipment.

For example, for downlink measurement values such as RSRP, RSRQ, SINR, and downlink path loss, the terminal device may obtain the downlink measurement values in a downlink measurement manner. For example, the RSRP is obtained according to an average value of signal powers received on all Resource Elements (REs) carrying reference signals within a certain symbol of a downlink signal of the network device; obtaining RSRQ according to the ratio of the RSRP to a Received Signal Strength Indication (RSSI) of a downlink Signal of the network equipment; obtaining an SINR according to the ratio of the strength of a useful signal in a received downlink signal of the network equipment to the strength of an interference signal (noise and interference); and obtaining the downlink path loss according to the difference value between the signal strength of the downlink signal sent in the downlink signal of the network equipment and the RSRP.

S503: and the terminal equipment determines a target TA according to the obtained downlink measurement value.

For example, if the mapping relationship between the downlink measurement value and the TA is expressed based on a mapping relationship, the obtained downlink measurement value may be substituted into the mapping relationship, and the target TA is obtained by solving. For another example, if the mapping relationship between the downlink measurement value and the TA is represented based on the mapping relationship, the mapping relationship table may be queried based on the obtained downlink measurement value to obtain the target TA.

S504: and the terminal equipment sends a random access request to the network equipment according to the target TA, wherein the random access request comprises a random access preamble and uplink data.

In this embodiment of the present application, the random access request refers to MsgA in two-step random access, and includes a random access preamble and uplink data, where the uplink data is a valid bearer (PUSCH payload) or an uplink payload (UL payload) of a physical uplink shared channel, that is, Msg3 of four-step random access shown in fig. 3, and the uplink data may be an RRC connection establishment request, an RRC reestablishment request, an RRC connection recovery, a beam recovery request, a system message acquisition request based on Msg3, packet data, and the like.

Before random access, the terminal equipment obtains a downlink measurement value between the terminal equipment and the network equipment through downlink measurement, and determines a target TA corresponding to the downlink measurement value obtained through measurement according to the downlink measurement value obtained through measurement and a mapping relation between the downlink measurement value and the TA. Taking the downlink measurement value as RSBP, the mapping relationship between the downlink measurement value and TA as shown in table 1 as an example, the downlink measurement value between the terminal device and the network device obtained through downlink measurement is B₁Determining the sum of₁The corresponding target TA is TA₂₁. And the terminal equipment determines the PRACH time frequency resource, the random access preamble and the PUSCH time frequency resource adopted for initiating the random access according to the information of the PRACH time frequency resource, the random access preamble and the PUSCH time frequency resource configured for the random access by the network equipment.

In S504, in a possible implementation, the terminal device determines the sending time of the random access preamble according to the position of the PRACH time-frequency resource used for initiating random access in the time domain and the target TA, determines the sending time of the uplink data according to the position of the PUSCH time-frequency resource used in the time domain and the target TA, and sends the random access preamble and the uplink data to the network device according to the determined sending time of the random access preamble and the determined sending time of the uplink data, thereby completing sending of the random access request, that is, the target TA acts on sending/transmitting of the random access preamble and the uplink data at the same time.

In another possible implementation, the terminal device directly determines the sending time of the random access preamble according to the position of the PRACH time-frequency resource used for initiating random access in the time domain, determines the sending time of the uplink data according to the position of the PUSCH time-frequency resource used in the time domain and the target TA, and sends the random access preamble and the uplink data to the network device according to the determined sending time of the random access preamble and the determined sending time of the uplink data, so as to complete the sending of the random access request, that is, the target TA only acts on the sending/transmission of the uplink data.

After the terminal device sends the random access request to the network device, a Physical Downlink Control Channel (PDCCH) of the network device is monitored in a random access response receiving window, so as to ensure the reception of the random access response sent by the network device. In the embodiment of the application, in order to ensure the terminal device to receive the random access response, a discontinuous reception (C-DRX) active period of the terminal device includes a random access response receiving window, and if the C-DRX active period overlaps with a measurement GAP (GAP) of the terminal device, the terminal device monitors the PDCCH. That is, in the random access response receiving window, the C-DRX of the terminal device is in an active period, the terminal device can monitor whether there is transmission of a random access response in the PDCCH, and if the random access response receiving window overlaps with the measurement GAP of the terminal device, there is a collision, the terminal device does not interrupt transmission and reception of data, continues to monitor the PDCCH, and does not measure information of the target cell, so as to ensure reception of the random access response.

Here, the random access response refers to MsgB in two-step random access, i.e., response information for a random access request (MsgA), including at least one of response information for a random access preamble and response information for uplink data.

S505: the network equipment sends a random access response, and the terminal equipment receives the random access response.

After receiving a random access request which is sent by a terminal device and comprises a random access preamble and uplink data, a network device generates response information aiming at the random access preamble, wherein the response information can comprise parameters such as the random access preamble and TC-RNTI, the situation that the network device distributes the same TC-RNTI for a plurality of terminal devices possibly occurs at the moment, if the situation that the network device distributes the same TC-RNTI for the plurality of terminal devices occurs, the network device selects a terminal device identifier from the plurality of terminal devices which distribute the same TC-RNTI according to the terminal device identifier contained in the uplink data, generates a competition resolving message through TC-RNTI scrambling, and sends the competition resolving message comprising the response information aiming at the random access preamble to the terminal device.

The terminal equipment receives the random access response in the random access response receiving window, if the terminal equipment successfully analyzes the self identification from the competition resolving message according to the TC-RNTI in the random access response, namely, the TC-RNTI data unit (service data unit, SDU) in the random access response is successfully analyzed, the random access success is shown, the terminal equipment can start or restart a non-activated timer (DRX-inactive timer), continue to monitor the PDCCH, and restart the DRX-inactive timer when monitoring new data transmission of the PDCCH until the DRX-inactive timer is overtime.

[ example two ]

In another possible communication procedure, the configuration information includes a mapping relationship between the downlink measurement value and the TA, and further includes a mapping relationship between the downlink measurement value and a timing advance offset (TA _ offset), and the communication procedure is as shown in fig. 6.

S601: the network device sends configuration information, and the terminal device receives the configuration information, where the configuration information includes a mapping relationship between a downlink measurement value and a TA and a mapping relationship between the downlink measurement value and a TA _ offset.

S602: and the terminal equipment obtains a downlink measurement value with the network equipment.

S603: and the terminal equipment determines a target TA and a target TA _ offset according to the obtained downlink measurement value.

S604: and the terminal equipment adjusts the target TA according to the target TA _ offset.

S605: and the terminal equipment sends a random access request to the network equipment according to the target TA, wherein the random access request comprises a random access preamble and uplink data.

S606: the network equipment sends a random access response, and the terminal equipment receives the random access response.

Different from the communication process shown in fig. 5, in order to further refine the TA and ensure the reliability of uplink data transmission, the network device further introduces a mapping relationship between the downlink measurement value and TA _ offset into the configuration information, so that the terminal device determines a target TA _ offset according to the obtained downlink measurement value and adjusts the target TA determined according to the obtained downlink measurement value and the mapping relationship between the downlink measurement value and the TA. Similar to the mapping relationship between the downlink measurement value and TA, the mapping relationship between the downlink measurement value and TA _ offset may be expressed by a mapping equation between the downlink measurement value and TA _ offset, or a mapping table between the downlink measurement value and TA _ offset.

Taking the downlink measurement value as RSRP as an example, the mapping relation between the downlink measurement value and TA _ offset may be TA _ offset ═ U × RSRP + V, where U and V are parameters configured according to RSRP between the terminal device and the network device and the corresponding TA _ offset at a distance different from the network device.

Still taking the downlink measurement value as RSRP as an example, the mapping relationship between the downlink measurement value and TA _ offset may be as follows:

TABLE 2

Similarly, if the downlink measurement value includes multiple RSRP, RSRQ, SINR, or downlink loss, etc., taking the downlink measurement value includes RSRP, RSRQ, SINR, and downlink loss as an example, the mapping relation between the downlink measurement value and TA _ offset may be TA ═ S × RSRP + T × RSRQ + W × SINR + X × XXLS + Y, where XXLS is downlink loss, and S, T, W, X, Y is a parameter configured according to RSRP, RSRQ, SINR, downlink loss, and corresponding TA _ offset between the terminal device and the network device at a different distance from the network device. If the mapping relationship between the downlink measurement value and the TA _ offset exists in the form of a mapping relationship table between the downlink measurement value and the TA _ offset, the TA _ offset mapped to each possible set of RSRP, RSRQ, SINR, and downlink loss is recorded in the mapping relationship table between the downlink measurement value and the TA _ offset.

When the configuration information includes a mapping relationship between a downlink measurement value and a TA (timing advance) and a mapping relationship between the downlink measurement value and a TA _ offset, before random access is performed, the terminal equipment obtains the downlink measurement value between the terminal equipment and the network equipment through downlink measurement, and determines a target TA corresponding to the downlink measurement value obtained through measurement according to the downlink measurement value obtained through measurement and the mapping relationship between the downlink measurement value and the TA; and determining a target TA _ offset corresponding to the downlink measurement value obtained by measurement according to the downlink measurement value obtained by measurement and the mapping relation between the downlink measurement value and the TA _ offset, and adjusting the target TA by the target TA _ offset. Taking the downlink measurement value RSBP, the mapping relationship between the downlink measurement value and TA as shown in table 1, and the mapping relationship between the downlink measurement value and TA _ offset as shown in table 2 as an example, the downlink measurement value between the terminal device and the network device obtained through downlink measurement is B₁Determining the sum of₁The corresponding target TA is TA₂₁And B is₁The corresponding target TA _ offset is offset₂₁Terminal equipment passes offset₂₁For TA₂₁Adjusting to obtain target TA (TA) of random access application₂₁+offset₂₁)。

In the communication process shown in fig. 6, for the transmission and reception of the configuration information, the transmission of the random access request by the terminal device, the reception of the random access response sent by the network device, and the like, reference may be made to the communication process shown in fig. 5, and repeated details are not repeated.

[ EXAMPLE III ]

In another possible communication process, the configuration information includes a mapping relationship between a downlink measurement value and a TA, and further includes a mapping relationship between a number of retransmission requests of random access requests and a timing advance increment step (TA _ ramping step), and the communication process is shown in fig. 7.

S701: the network equipment sends configuration information, and the terminal equipment receives the configuration information, wherein the configuration information comprises a mapping relation between a downlink measurement value and a TA (timing advance) and a mapping relation between the retransmission times of the random access request and the TA _ Rampingstep.

S702: and the terminal equipment obtains a downlink measurement value between the terminal equipment and the network equipment and obtains the retransmission times of the random access request.

S703: the terminal equipment determines a target TA according to the obtained downlink measurement value; and determining a target TA _ Rampingstep according to the obtained random access request retransmission times.

S704: and the terminal equipment adjusts the target TA according to the target TA _ Rampingstep.

S705: and the terminal equipment sends a random access request to the network equipment according to the target TA, wherein the random access request comprises a random access preamble and uplink data.

S706: the network equipment sends a random access response, and the terminal equipment receives the random access response.

Different from the communication process shown in fig. 5, the network device further introduces a mapping relationship between the number of retransmission times of the random access request and TA _ ranging step into the configuration information, and is configured to adjust the target TA determined according to the obtained downlink measurement value and the mapping relationship between the downlink measurement value and the TA according to the mapping relationship between the number of retransmission times of the random access request and the TA _ ranging step when the random access request is retransmitted or repeatedly sent. The terminal device includes a counting module/counter (counter) for recording the retransmission times of the random access request, wherein the count of the counter is increased by 1 every time the random access request or the uplink data is retransmitted.

Similar to the mapping relationship between the downlink measurement value and the TA, the mapping relationship between the number of retransmission requests of random access and the TA _ ranging step may also be expressed in the form of a mapping relationship between the number of retransmission requests of random access and the TA _ ranging step, or in the form of a mapping relationship table between the number of retransmission requests of random access and the TA _ ranging step. The mapping relation between the number of random access request retransmissions and TA _ ranging step may be TA _ ranging step ═ counter + J, where counter is the number of random access request retransmissions, I, J configured timing advance increment step size adjustment parameter. The mapping table of the random access request retransmission times and the TA _ mapping step may be as follows:

counter	TA_Rampingstep
		0	step₀
1	step₁
		2	Step₂
……	……
		n	step_n

TABLE 3

In table 1, the counter is the number of random access request retransmissions, and when the counter value is 0, it indicates that no random access request retransmission is currently performed, and step may be performed₀Is set to 0. Specifically, when the configuration information includes a mapping relationship between a downlink measurement value and a TA and a mapping relationship between a random access request retransmission number and a TA _ Rampingstep, before performing random access, the terminal device may first determine whether the random access request is a retransmission random access request, if so, the terminal device obtains the downlink measurement value and the random access request retransmission number between the terminal device and the network device through downlink measurement, and determines a target TA corresponding to the measured downlink measurement value according to the measured downlink measurement value and the mapping relationship between the downlink measurement value and the TA; and determining and obtaining random access according to the obtained random access request retransmission times and the mapping relation between the random access request retransmission times and TA _ RampingstepAnd requesting a target TA _ Rampingstep corresponding to the retransmission times, and adjusting the target TA through the target TA _ Rampingstep. Taking the downlink measurement value as RSBP, the mapping relationship between the downlink measurement value and TA as shown in table 1, the mapping relationship between the number of random access requests for retransmission and TA _ mapping step as shown in table 3 as an example, the number of random access requests for retransmission obtained by the terminal device is 2, and the downlink measurement value between the network device and the terminal device obtained by the downlink measurement is B₁Determining the sum of₁The corresponding target TA is TA₂₁The target TA _ Rampingstep corresponding to 2 is step₂The terminal equipment passes step₂For TA₂₁Adjusting to obtain target TA (TA) of random access application₂₁+step₂)。

Of course, on the basis that the configuration information includes the mapping relationship between the downlink measurement value and the TA, the network device may also introduce the mapping relationship between the downlink measurement value and the TA _ offset, and the mapping relationship between the number of retransmission requests of the random access and the TA _ ranging step at the same time, so as to adjust the TA. Taking the downlink measurement value as RSBP, the mapping relationship between the downlink measurement value and TA as shown in table 1, the mapping relationship between the downlink measurement value and TA _ offset as shown in table 2, and the mapping relationship between the number of retransmission requests and TA _ mapping step as shown in table 3 as an example, the number of retransmission requests of random access obtained by the terminal device is 2, and the downlink measurement value between the network device and the downlink measurement value obtained by the downlink measurement is B₁Determining the sum of₁The corresponding target TA is TA₂₁And B is₁The corresponding target TA _ offset is offset₂₁The target TA _ Rampingstep corresponding to 2 is step₂Obtaining a target TA (TA) of a random access application₂₁+offset₂₁+step₂)。

In order to ensure the effect of random access, the terminal device may further detect whether a currently applied random access type (RACH type) satisfies a condition for random access type handover, and when it is determined that the currently applied random access type satisfies the handover condition, switch the applied random access type to ensure reliability of random access. The terminal equipment determines that the random access type of the current application meets at least one of the following switching conditions: (1) the number of times that the terminal equipment initiates the random access request on the currently applied random access type is greater than a first threshold value; (2) the terminal equipment is switched to a wave beam and/or a bandwidth and/or a carrier wave which are not in accordance with the random access type of the current application; (3) the number of times of continuous failures of the terminal equipment to initiate the random access request on the currently applied random access type is greater than a second threshold value; (4) and the terminal equipment determines that the downlink measurement value is greater than a third threshold value or less than a fourth threshold value.

The first threshold, the second threshold, the third threshold, the fourth threshold, and the beam and/or bandwidth and/or carrier corresponding to the random access type, such as the beam and/or bandwidth and/or carrier corresponding to the four-step random access, and the beam and/or bandwidth and/or carrier corresponding to the two-step random access, may be sent to the terminal device by the network device through broadcast or multicast messages, or through RRC messages dedicated to the terminal device, or may be predefined by a protocol.

In addition, in order to avoid the problem of unnecessary random access failure, the terminal device may further initialize random access parameters after switching the random access type, where the random access parameters include one or more of the number of times of initiating a random access request, the number of times of power ramp-up, a PUSCH payload buffer (buffer), and an Msg3 buffer.

Referring to fig. 8, it is assumed that a random access type currently applied by a terminal device is two-step random access, when two-step random access satisfies a handover condition, for example, when a number of times of initiating a random access request on the two-step random access is greater than a first threshold, or a number of times of initiating a random access request on the two-step random access continuously fails is greater than a second threshold, it is determined that the two-step random access satisfies the handover condition, the two-step random access is switched to four-step random access, and random access is initiated on a resource of the four-step random access configured by a network device, so as to ensure an effect of the random access. Meanwhile, the terminal equipment initializes the stored random access parameters after switching from the two-step random access to the four-step random access, so as to avoid errors occurring in the random access parameters of the two-step random access stored by the application terminal equipment when the terminal equipment performs the four-step random access after switching.

The above-mentioned interaction between the main network device and the terminal device introduces the scheme provided in the present application. It is to be understood that, in order to implement the above functions, each network element includes a corresponding hardware structure and/or software module (or unit) for performing each function. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In case of integrated units (modules), fig. 9 shows a possible exemplary block diagram of a communication device, which may be in the form of software 900, in the embodiments of the present application. The apparatus 900 may include: a processing unit 902 and a transceiving unit 903. The processing unit 902 is used for controlling and managing the operation of the apparatus 900. The transceiving unit 903 is used to support communication of the apparatus 900 with other network entities. Alternatively, the transceiving unit 903 may comprise a receiving unit and/or a transmitting unit for performing receiving and transmitting operations, respectively. The apparatus 900 may further comprise a storage unit 901 for storing program codes and/or data of the apparatus 900.

The apparatus 900 may be the terminal device in any of the above embodiments, or may also be a semiconductor chip disposed in the terminal device. Processing unit 902 may enable apparatus 900 to perform the actions of the terminal device in the above method examples. Alternatively, the processing unit 902 mainly performs the internal actions of the terminal device in the method example, and the transceiving unit 903 may support communication between the apparatus 900 and the network device.

Specifically, in a possible embodiment, the transceiver 903 is configured to receive configuration information, where the configuration information includes a mapping relationship between a downlink measurement value and a timing advance TA; a processing unit 902, configured to obtain a downlink measurement value; the processing unit 902 is further configured to determine a target TA according to the obtained downlink measurement value.

In a possible design, if the configuration information further includes a mapping relationship between a downlink measurement value and a timing advance offset TA _ offset, the processing unit 902 is further configured to determine a target TA _ offset according to the obtained downlink measurement value after determining the target TA; and adjusting the target TA according to the target TA _ offset.

In a possible design, if the configuration information further includes a mapping relationship between the number of random access request retransmissions and a timing advance increment step TA _ mapping step, the processing unit 902 is further configured to obtain the number of random access retransmissions after determining a target TA; determining a target TA _ Rampingstep according to the obtained random access retransmission times; and adjusting the target TA according to the target TA _ Rampingstep.

In one possible design, the downlink measurements include one or more of:

reference signal received power, RSRP; or the like, or, alternatively,

reference signal received quality, RSRQ; or the like, or, alternatively,

a reference signal to interference plus noise ratio (SINR); or the like, or, alternatively,

and (4) downlink path loss.

In a possible design, the transceiver 903 is further configured to send a random access request according to the target TA, where the random access request includes a random access preamble and uplink data.

In one possible design, the transceiver 903 is further configured to receive a random access response;

the processing unit 902 is further configured to start or restart an inactive timer DRX-inactive timer when the temporary cell radio network temporary identity data unit TC-RNTI SDU in the random response is successfully parsed.

In one possible design, the discontinuous reception C-DRX active period of the transceiver unit 903 comprises a random access acknowledgement receive window.

In one possible design, if the random access response receiving window overlaps with the measurement GAP of the transceiver 903, the transceiver 903 monitors a physical downlink control channel PDCCH.

In a possible design, the processing unit 902 is further configured to switch the random access type of the application when it is determined that the random access type of the current application satisfies the handover condition.

In one possible design, the processing unit 902 determines that the currently applied random access type satisfies the handover condition when at least one of the following conditions is satisfied:

the number of times of initiating random access requests on the currently applied random access type is greater than a first threshold value;

switching to a beam and/or bandwidth and/or carrier that is not in accordance with the currently applied random access type;

the number of continuous failures of initiating the random access request on the currently applied random access type is greater than a second threshold value;

the downlink measurement value is greater than a third threshold or less than a fourth threshold.

In one possible design, the processing unit 902 is further configured to initialize random access parameters, where the random access parameters include one or more of a number of times of initiating a random access request, a number of times of power ramp, a physical uplink shared channel payload PUSCH payload buffer, and an Msg3 buffer.

As shown in fig. 10, the terminal device 1000 according to the embodiment of the present application is further provided, where the terminal device 1000 includes a processor 1010, a memory 1020 and a transceiver 1030, where the memory 1020 stores instructions or programs, and the memory 1020 is used to implement the functions of the storage unit 901 in the foregoing embodiments. The processor 1010 is operative to execute instructions or programs stored in the memory 1020. When the instructions or programs stored in the memory 1020 are executed, the processor 1010 is configured to perform the operations performed by the processing unit 902 in the above embodiments, and the transceiver 1030 is configured to perform the operations performed by the transceiver 903 in the above embodiments.

It should be understood that the terminal device 900 or the terminal device 1000 according to the embodiment of the present application may correspond to the terminal device in the communication method (fig. 5 to fig. 8) according to the embodiment of the present application, and operations and/or functions of each module in the terminal device 900 or the terminal device 1000 are respectively for implementing corresponding flows of each method in fig. 5 to fig. 8, and are not described herein again for brevity.

In case of integrated units (modules), fig. 11 shows a possible exemplary block diagram of yet another apparatus involved in embodiments of the present application, which apparatus 1100 may be in the form of software. The apparatus 1100 may include: a processing unit 1102 and a transceiving unit 1103. The processing unit 1102 is configured to control and manage operations of the apparatus 1100. The transceiving unit 1103 is used to support communication of the apparatus 1100 with other network entities. Optionally, the transceiving unit 1103 may comprise a receiving unit and/or a transmitting unit for performing receiving and transmitting operations, respectively. The apparatus 1100 may further comprise a storage unit 1101 for storing program codes and/or data of the apparatus 1100.

The apparatus 1100 may be a network device in any of the above embodiments (for example, the network device is the network device in the first embodiment), or may also be a semiconductor chip disposed in the network device. The processing unit 1102 may enable the apparatus 1100 to perform the actions of the network device in the above method examples. Alternatively, the processing unit 1102 mainly performs the network device internal actions in the method example, and the transceiving unit 1103 may support communication between the apparatus 1100 and the terminal device.

Specifically, in an embodiment, the processing unit 1102 is configured to obtain configuration information, where the configuration information includes a mapping relationship between a downlink measurement value and a timing advance TA; a transceiving unit 1103, configured to send the configuration information.

In one possible design, the configuration information further includes:

and mapping relation between the downlink measurement value and the timing advance offset TA _ offset.

In one possible design, the configuration information further includes:

and the mapping relation between the random access request retransmission times and the timing advance increasing step TA _ Rampingstep.

As shown in fig. 12, an embodiment of the present application further provides a network device 1200, where the network device 1200 includes a processor 1210, a memory 1220 and a transceiver 1230, where the memory 1220 stores instructions or programs, and the memory 1220 is used to implement the functions of the storage unit 1101 in the foregoing embodiments. The processor 1210 is used to execute instructions or programs stored in the memory 1220. When the instructions or programs stored in the memory 1220 are executed, the processor 1210 is configured to perform the operations performed by the processing unit 1102 in the above embodiment, and the transceiver 1230 is configured to perform the operations performed by the transceiver unit 1103 in the above embodiment.

It should be understood that the network device 1100 or the network device 1200 according to the embodiment of the present application may correspond to the network device in the communication method (fig. 5 to 8) according to the embodiment of the present application, and operations and/or functions of each module in the network device 1100 or the network device 1200 are not described herein again for brevity in order to implement the corresponding flow of each method in fig. 5 to 8, respectively.

The embodiment of the application also provides a communication device, and the communication device can be terminal equipment or a circuit. The communication device may be configured to perform the actions performed by the terminal device in the above-described method embodiments.

When the communication apparatus is a terminal device, fig. 13 shows a simplified structural diagram of the terminal device. For easy understanding and illustration, in fig. 13, the terminal device is exemplified by a mobile phone. As shown in fig. 13, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 13. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, the antenna and the radio frequency circuit having the transceiving function may be regarded as a transceiving unit (or a communication unit) of the terminal device, and the processor having the processing function may be regarded as a processing unit of the terminal device. As shown in fig. 13, the terminal device includes a transceiving unit 1310 and a processing unit 1320. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Alternatively, a device for implementing the receiving function in the transceiving unit 1310 may be regarded as a receiving unit, and a device for implementing the transmitting function in the transceiving unit 1310 may be regarded as a transmitting unit, that is, the transceiving unit 1310 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiving circuitry, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.

It should be understood that the transceiving unit 1310 is configured to perform the transmitting operation and the receiving operation on the terminal device side in the above method embodiments, and the processing unit 1320 is configured to perform other operations besides the transceiving operation on the terminal device in the above method embodiments.

For example, in one implementation, the transceiving unit 1310 is configured to perform the transmitting and receiving operations of the terminal device side in S501, S504, and S505 of fig. 5, and/or the transceiving unit 1310 is further configured to perform other transceiving steps of the terminal device side in the embodiment of the present application. The processing unit 1320 is configured to execute S502 and S503 in fig. 5, and/or the processing unit 1320 is further configured to execute other processing steps on the terminal device side in this embodiment.

For another example, in another implementation manner, the transceiver 1310 is configured to perform the sending operation on the terminal device side in S601, S605, and S606 of fig. 6, and/or the transceiver 1310 is further configured to perform other transceiving steps on the terminal device side in this embodiment. The processing unit 1320 is configured to perform S602, S603, and S604 in fig. 6, and/or the processing unit 1320 is further configured to perform other processing steps on the terminal device side in the embodiment of the present application.

For another example, in another implementation manner, the transceiver 1310 is configured to perform the transmitting operation on the terminal device side in S701, S705, and S706 in fig. 7, and/or the transceiver 1310 is further configured to perform other transceiving steps on the terminal device side in this embodiment. The processing unit 1320 is configured to execute S702, S703, and S704 in fig. 7, and/or the processing unit 1320 is further configured to execute other processing steps on the terminal device side in the embodiment of the present application.

When the communication device is a chip-like device or circuit, the device may comprise a transceiver unit and a processing unit. The transceiver unit may be an input/output circuit and/or a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit.

When the communication device in this embodiment is a terminal device, reference may be made to the device shown in fig. 14. As an example, the device may perform functions similar to processor 1010 of FIG. 10. In fig. 14, the apparatus includes a processor 1410, a transmit data processor 1420, and a receive data processor 1430. The processing unit 902 in the above embodiments may be the processor 1410 in fig. 14, and performs corresponding functions. The transceiving unit 903 in the above-described embodiment may be the transmission data processor 1420, and/or the reception data processor 1430 in fig. 14. Although fig. 14 shows a channel encoder, a modulator, a symbol generation module, a channel decoder, a demodulator, and a channel estimation module, it is understood that these modules are not limitative and only illustrative.

Fig. 15 shows another form of the present embodiment. The processing device 1500 includes modules such as a modulation subsystem, a central processing subsystem, and peripheral subsystems. The communication device in this embodiment may serve as a modulation subsystem therein. In particular, the modulation subsystem may include a processor 1503 and an interface 1504. The processor 1503 performs the functions of the processing unit 902, and the interface 1504 performs the functions of the transceiver 903. As another variation, the modulation subsystem includes a memory 1506, a processor 1503, and a program stored in the memory 1506 and executable on the processor, and the processor 1503 executes the program to implement the method of the terminal device side in the above method embodiments. It should be noted that the memory 1506 may be non-volatile or volatile, and may be located within the modulation subsystem or within the processing device 1500, as long as the memory 1506 is connected to the processor 1503.

As another form of the present embodiment, there is provided a computer-readable storage medium having stored thereon instructions that, when executed, may perform the method on the terminal device side in the above-described method embodiments.

As another form of the present embodiment, there is provided a computer program product containing instructions that, when executed, may perform the method on the terminal device side in the above-described method embodiments.

When the apparatus in this embodiment is a network device, the network device may be as shown in fig. 16, and the apparatus 1600 includes one or more radio frequency units, such as a Remote Radio Unit (RRU) 1610 and one or more baseband units (BBUs) (which may also be referred to as digital units, DUs) 1620. The RRU 1610 may be referred to as a transceiver unit, which corresponds to the transceiver unit 1103 in fig. 11, and may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1611 and a radio frequency unit 1612. The RRU 1610 portion is mainly used for transceiving radio frequency signals and converting the radio frequency signals into baseband signals, for example, for sending configuration information to a terminal device. The BBU 1620 is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 1610 and the BBU 1620 may be physically located together or physically located separately, that is, distributed base stations.

The BBU 1620 is a control center of the base station, and may also be referred to as a processing module, and may correspond to the processing unit 1102 in fig. 11, and is mainly used for completing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing module) may be configured to control the base station to perform an operation procedure related to the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.

In an example, the BBU 1620 may be formed by one or more boards, and the boards may collectively support a radio access network of a single access system (e.g., an LTE network), or may respectively support radio access networks of different access systems (e.g., an LTE network, a 5G network, or other networks). BBU 1620 also includes a memory 1621 and a processor 1622. The memory 1621 is used to store the necessary instructions and data. The processor 1622 is configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure related to the network device in the above method embodiment. The memory 1621 and processor 1622 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

As another form of the present embodiment, a computer-readable storage medium is provided, on which instructions are stored, and when executed, the instructions may perform the method on the network device side in the above method embodiment.

As another form of the present embodiment, there is provided a computer program product containing instructions, which when executed can perform the method on the network device side in the above method embodiments.

In implementation, the steps of the method provided by this embodiment may be implemented by hardware integrated logic circuits in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general-purpose Central Processing Unit (CPU), a general-purpose processor, a Digital Signal Processing (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof; or a combination that performs a computing function, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will be appreciated that the memory or storage units in the embodiments of the application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer program or instructions may be stored in or transmitted over a computer-readable storage medium. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or an optical medium, such as a DVD; it may also be a semiconductor medium, such as a Solid State Disk (SSD).

The various illustrative logical units and circuits described in this application may be implemented or operated upon by design of a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The steps of a method or algorithm described in the embodiments herein may be embodied directly in hardware, in a software element executed by a processor, or in a combination of the two. The software cells may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be disposed in a terminal device. In the alternative, the processor and the storage medium may reside as discrete components in a terminal device.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Although the embodiments of the present application have been described with reference to specific features, it is apparent that various modifications and combinations can be made thereto without departing from the spirit and scope of the embodiments of the present application. Accordingly, the specification and figures are merely exemplary of embodiments of the application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the embodiments of the application.

Claims

1. A method of communication, comprising:

the communication equipment receives configuration information, wherein the configuration information comprises a mapping relation between a downlink measurement value and a Timing Advance (TA);

the communication equipment obtains a downlink measurement value;

and the communication equipment determines a target TA according to the obtained downlink measurement value.

2. The method according to claim 1, wherein if the configuration information further includes a mapping relationship between downlink measurement values and timing advance offset TA _ offset, after the communication device determines the target TA, further comprising:

the communication equipment determines a target TA _ offset according to the obtained downlink measurement value;

the communication device adjusts the target TA according to the target TA _ offset.

3. The method according to claim 1 or 2, wherein if the configuration information further includes a mapping relationship between the number of random access request retransmissions and a timing advance increase step TA _ Rampingstep, after the communication device determines the target TA, further comprising:

the communication equipment obtains the random access retransmission times;

the communication equipment determines a target TA _ Rampingstep according to the obtained random access retransmission times;

and the communication equipment adjusts the target TA according to the target TA _ Rampingstep.

4. The method of any of claims 1-3, wherein the downlink measurements include one or more of:

reference signal received power, RSRP; or the like, or, alternatively,

reference signal received quality, RSRQ; or the like, or, alternatively,

and (4) downlink path loss.

5. The method of any one of claims 1-4, further comprising:

and the communication equipment sends a random access request according to the target TA, wherein the random access request comprises a random access preamble and uplink data.

6. The method of claim 5, wherein the method further comprises:

the communication device receives a random access response;

and the communication equipment starts or restarts the DRX-inactive timer when successfully analyzing the temporary cell radio network temporary identification data unit TC-RNTI SDU in the random response.

7. The method of any of claims 1-6, wherein a discontinuous reception, C-DRX, active period of the communication device comprises a random access acknowledgement, receive, window.

8. The method of claim 7, wherein the communication device monitors a Physical Downlink Control Channel (PDCCH) if the Random Access Response (RAR) reception window overlaps with a measurement GAP (GAP) of the communication device.

9. The method of any one of claims 1-8, further comprising:

and the communication equipment switches the random access type of the application when determining that the random access type of the current application meets the switching condition.

10. The method of claim 9, wherein the communication device determines that a currently applied random access type satisfies a handover condition when at least one of the following conditions is satisfied:

the number of times that the communication equipment initiates the random access request on the currently applied random access type is greater than a first threshold value;

the communication device switches to a beam and/or bandwidth and/or carrier that is not in accordance with the currently applied random access type;

the communication equipment initiates a random access request on the currently applied random access type, and the continuous failure times are greater than a second threshold value;

the communication device determines that the downlink measurement value is greater than a third threshold or less than a fourth threshold.

11. The method of claim 9, wherein the method further comprises:

initializing random access parameters, wherein the random access parameters comprise one or more of the times of initiating random access requests, the times of power ramp-up, a physical uplink shared channel payload PUSCH payload buffer and an Msg3 buffer.

12. A method of communication, comprising:

the network equipment sends configuration information, wherein the configuration information comprises a mapping relation between a downlink measurement value and a Timing Advance (TA).

13. The method of claim 12, wherein the configuration information further comprises:

14. The method of claim 12 or 13, wherein the configuration information further comprises:

15. A communications apparatus, comprising:

a transceiver unit, configured to receive configuration information, where the configuration information includes a mapping relationship between a downlink measurement value and a timing advance TA;

a processing unit for obtaining a downlink measurement value;

the processing unit is further configured to determine a target TA according to the obtained downlink measurement value.

16. The apparatus as claimed in claim 15, wherein if the configuration information further includes a mapping relationship between downlink measurement values and timing advance offsets TA _ offset, the processing unit, after determining the target TA, is further configured to determine a target TA _ offset according to the obtained downlink measurement values; and adjusting the target TA according to the target TA _ offset.

17. The apparatus according to claim 15 or 16, wherein if the configuration information further includes a mapping relationship between a number of random access request retransmissions and a timing advance increase step TA _ Rampingstep, the processing unit is further configured to obtain the number of random access retransmissions after determining a target TA; determining a target TA _ Rampingstep according to the obtained random access retransmission times; and adjusting the target TA according to the target TA _ Rampingstep.

18. The apparatus of any one of claims 15-17, wherein the downlink measurements comprise one or more of:

reference signal received power, RSRP; or the like, or, alternatively,

reference signal received quality, RSRQ; or the like, or, alternatively,

and (4) downlink path loss.

19. The apparatus according to any of claims 15-18, wherein the transceiver unit is further configured to send a random access request according to the target TA, where the random access request includes a random access preamble and uplink data.

20. The apparatus of claim 19, wherein the transceiver unit is further configured to receive a random access response;

the processing unit is further configured to start or restart the non-active timer DRX-inactive timer when the temporary cell radio network temporary identifier data unit TC-RNTI SDU in the random response is successfully parsed.

21. The apparatus of any one of claims 15-20, wherein a discontinuous reception, C-DRX, active period of the transceiver unit comprises a random access acknowledgement reception window.

22. The apparatus of claim 21, wherein the transceiver unit monitors a Physical Downlink Control Channel (PDCCH) if the Random Access Response (RAR) receiving window overlaps a measurement GAP (GAP) of the transceiver unit.

23. The apparatus according to any of claims 15-22, wherein the processing unit is further configured to handover the random access type of the application upon determining that the random access type of the current application satisfies the handover condition.

24. The apparatus of claim 23, wherein the processing unit determines that a currently applied random access type satisfies a handover condition when at least one of the following conditions is satisfied:

25. The apparatus of claim 23, wherein the processing unit is further configured to initialize random access parameters, the random access parameters including one or more of a number of times a random access request is initiated, a number of power ramps, a physical uplink shared channel payload, PUSCH payload, buffer, and Msg3 buffer.

26. A communications apparatus, comprising:

a processing unit, configured to obtain configuration information, where the configuration information includes a mapping relationship between a downlink measurement value and a timing advance TA;

and the transceiving unit is used for sending the configuration information.

27. The apparatus of claim 26, wherein the configuration information further comprises:

28. The apparatus of claim 26 or 27, wherein the configuration information further comprises:

29. A communication apparatus comprising a memory, a processor, and a program stored on the memory and executable on the processor, wherein the processor implements the communication method according to any one of claims 1 to 11 when executing the program.

30. A communication apparatus comprising a memory, a processor and a program stored on the memory and executable on the processor, wherein the processor implements the communication method according to any one of claims 12 to 14 when executing the program.