WO2016201701A1

WO2016201701A1 - Communication method and apparatus

Info

Publication number: WO2016201701A1
Application number: PCT/CN2015/081958
Authority: WO
Inventors: 王坚; 李榕; 罗禾佳
Original assignee: 华为技术有限公司
Priority date: 2015-06-19
Filing date: 2015-06-19
Publication date: 2016-12-22
Also published as: CN107710839B; CN107710839A

Abstract

Disclosed are a communication method and communication apparatus. The method comprises: a first terminal device detects first time advance (TA) indication information, wherein the first TA indication information is sent by a second terminal device, and the first TA indication information is used to indicate a TA value of the second terminal device; and the first terminal device determines a TA value of the first terminal device according to the detected first TA indication information. The communication method and apparatus disclosed in the present invention can reduce the burden and signalling overhead of a network device.

Description

Communication method and device

Technical field

The present invention relates to the field of communications and, more particularly, to a communication method and apparatus.

Background technique

In a Long Term Evolution (LTE) system, a user equipment implements uplink synchronization with the base station through a closed-loop TA with a base station. Specifically, in a process of randomly accessing a network, the user equipment may generate a preamble sequence and send the preamble sequence to the base station. The base station may determine a Time Advance (TA) value of the user equipment according to the received preamble sequence, and send a random access response (RAR) carrying the TA value to the user equipment. After receiving the RAR, the user equipment may perform uplink timing adjustment according to the TA value carried in the RAR to complete uplink synchronization with the base station. In addition, the user equipment may enable a Time Alignment Timer. If the user equipment receives the TA update information sent by the base station before the time alignment timer expires, the user equipment may use the TA update information. Performing an uplink timing update, and resetting the time alignment timer, where the TA update information may be uplink information sent by the base station according to the received user equipment (eg, Demodulation Reference Signal (DMRS), detection) Determined by a Sounding Reference Signal (SRS), etc.; and if the user equipment does not receive the TA update information sent by the base station before the time alignment timer expires, the user equipment may determine uplink out-of-synchronization, And obtain its own TA value by executing the closed-loop TA process again.

However, in the above process, the base station needs to provide the initial TA value and the TA update information separately for each user equipment, and thus requires a large amount of signaling overhead.

Summary of the invention

The embodiment of the invention provides a communication method and a communication device, which can reduce the burden and signaling overhead of the network device.

In a first aspect, a communication method is provided, including: a first terminal device detecting first TA indication information, wherein the first TA indication information is sent by a second terminal device, and the first TA indication information is used by And indicating the TA value of the second terminal device; the first terminal device determines the TA value of the first terminal device according to the detected first TA indication information.

In a first possible implementation manner of the first aspect, determining, according to the detected first TA indication information, the TA value of the first terminal device, including: indicating, by the detected first TA indication information The TA value is determined as the TA value of the first terminal device.

In combination with the foregoing possible implementation manner, in a second possible implementation manner of the first aspect, the first TA indication information is further used to indicate a serving cell of the second terminal device; Determining the TA value of the first terminal device, including: if the current serving cell of the first terminal device is the same as the serving cell indicated by the first TA indication information, determining the first according to the detected first TA indication information The TA value of a terminal device.

In conjunction with the foregoing possible implementation manner, in a third possible implementation manner of the foregoing aspect, before the detecting the first TA indication information, the method further includes: receiving, by the network device, first indication information, the first indication The information is used to indicate that the first terminal device is a terminal device of the first type, where the terminal device of the first type is a terminal device that obtains a TA value from the TA indication information sent by the second type of terminal device, and the second A type of terminal device is a terminal device that acquires a TA value from the network device.

With reference to the foregoing possible implementation manner, in a fourth possible implementation manner of the foregoing aspect, the receiving, by the receiving network device, the first indication information includes: receiving the first indication sent by the network device in a random access procedure information.

In combination with the foregoing possible implementation manner, in a fifth possible implementation manner of the foregoing aspect, the method further includes: if the first terminal device is out of synchronization, obtaining a TA value of the first terminal device from the network device; The first TA indication information is continuously detected.

In conjunction with the foregoing possible implementation manner, in the sixth possible implementation manner of the foregoing aspect, before the detecting the first TA indication information, the method further includes: switching to the connection state from the initial access network device or from the sleep state to the connection state At the time of detecting, the second TA indication information is sent by the third terminal device that is determined to be the second type of terminal device, and the second TA indication information is used to indicate the third terminal device The TA value is determined. If the second TA indication information is detected within the preset time period, the first terminal device is determined to be the first type of terminal device.

In conjunction with the foregoing possible implementation manner, in a seventh possible implementation manner of the foregoing aspect, the method further includes: if the first terminal device is out of synchronization, obtaining a TA value of the first terminal device from the network device; It is determined that the first terminal device is changed from the first type of terminal device to the second type of terminal device.

In combination with the above possible implementation manner, in an eighth possible implementation manner of the first aspect, Detecting the first TA indication information includes: detecting the first TA indication information on the D2D broadcast channel.

In conjunction with the foregoing possible implementation manner, in the ninth possible implementation manner of the foregoing aspect, before the detecting the first TA indication information, the method further includes: receiving, by the network device, second indication information, the second indication The information is used to indicate at least one of a transmission resource, a transmission power, and a transmission mode of the first TA indication information. The detecting the first TA indication information includes: detecting, according to the second indication information, the first TA indication information.

The second aspect provides another communication method, including: acquiring, by the second terminal device, the TA value of the second terminal device from the network device; the second terminal device sending the first TA indication information to the first terminal device, where The first TA indication information is used to indicate a TA value of the second terminal device.

In a first possible implementation manner of the second aspect, the first TA indication information is further used to indicate a serving cell of the second terminal device.

In conjunction with the foregoing possible implementation manner, in a second possible implementation manner of the second aspect, before the obtaining, by the network device, the TA value of the second terminal device, the method further includes: receiving, by the network device, the first indication sent by the network device The first indication information is used to indicate that the second terminal device is a second type of terminal device, and the second type of terminal device is a terminal device that acquires a TA value from the network device.

In combination with the foregoing possible implementation manner, in a third possible implementation manner of the second aspect, the receiving, by the network device, the first indication information, that: receiving, by the network device, the first Instructions.

In conjunction with the foregoing possible implementation manner, in a fourth possible implementation manner of the second aspect, before the obtaining, by the network device, the TA value of the second terminal device, the method further includes: initially accessing the network device or When switching from the sleep state to the connected state, the second TA indication information is detected, the second TA indication information is sent by the third terminal device that has been determined to be the terminal device of the second type, and the second TA indication information is used for And indicating the TA value of the third terminal device; if the second TA indication information is not detected within the preset time period, determining that the second terminal device is the second type terminal device.

In conjunction with the foregoing possible implementation manner, in a fifth possible implementation manner of the second aspect, the sending, by the first terminal device, the first TA indication information includes: sending the first TA indication information on a D2D broadcast channel.

In conjunction with the foregoing possible implementation manner, in a sixth possible implementation manner of the second aspect, before the sending the first TA indication information to the first terminal device, the method further includes: receiving the network The second indication information that is sent to be sent, the second indication information is used to indicate at least one of a transmission resource, a transmission power, and a transmission manner of the first TA indication information; the first TA indication information is sent to the first terminal device, The method includes: sending, according to the second indication information, the first TA indication information to the first terminal device.

In a third aspect, another communication method is provided, including: determining a transmission resource of the TA indication information, wherein the TA indication information is sent by the second type of terminal device to the first type of terminal device, and the second The TA indication information sent by the terminal device of the type is used to indicate the TA value of the terminal device of the second type; the second indication information is sent, where the second indication information is used to indicate the transmission resource of the TA indication information.

In a first possible implementation manner of the third aspect, the sending the second indication information includes: sending the second indication information in a broadcast form.

In conjunction with the foregoing possible implementation manner, in a second possible implementation manner of the third aspect, the second indication information is further used to indicate a transmit power of the TA indication information; before the sending the second indication information, the method The method further includes: determining a desired transmission distance of the TA indication information according to the TA adjustment granularity; and determining, according to the expected transmission distance, a transmission power of the TA indication information.

In combination with the foregoing possible implementation manner, in a third possible implementation manner of the third aspect, the method further includes: determining that the first terminal device is the first type of terminal device or the second type of terminal device; The first terminal device sends the first indication information, where the first indication information is used to indicate that the first terminal device is the first type terminal device or the second type terminal device.

In conjunction with the foregoing possible implementation manner, in a fourth possible implementation manner of the third aspect, the sending, by the first terminal device, the first indication information, The first terminal device sends the first indication information.

With reference to the foregoing possible implementation manner, in a fifth possible implementation manner of the third aspect, the method further includes: receiving uplink information sent by the second terminal device; determining, according to the received uplink information, the second terminal device The uplink is out of synchronization; the third indication information is sent to the second terminal device, where the third indication information is used to indicate that the second terminal device is out of synchronization.

A fourth aspect provides another communication method, including: determining that the first terminal device is a first type terminal device or a second type terminal device, wherein the second type terminal device is acquiring a TA value from the network device. a terminal device, the terminal device of the first type is a terminal device that acquires a TA value from the detected TA indication information sent by the terminal device of the second type; and sends first indication information, where the first indication information is used to indicate The first terminal device is the first type of terminal device Or the second type of terminal device.

In a first possible implementation manner of the fourth aspect, the sending the first indication information includes: sending the first indication information in a random access procedure of the first terminal device.

A fifth aspect provides a communication apparatus, including: a detecting unit, configured to detect first TA indication information, where the first TA indication information is sent by a second terminal device, and the first TA indication information is used by The determining unit is configured to determine a TA value of the first terminal device according to the first TA indication information detected by the detecting unit.

In a first possible implementation manner of the fifth aspect, the first TA indication information is further used to indicate a serving cell of the second terminal device; the determining unit is specifically configured to: if the current serving cell of the first terminal device is The serving cell indicated by the first TA indication information is the same, and the TA value of the first terminal device is determined according to the first TA indication information detected by the detecting unit.

In combination with the foregoing possible implementation manner, in a second possible implementation manner of the fifth aspect, the determining unit is configured to determine, as the first terminal, a TA value indicated by the first TA indication information detected by the detecting unit. The TA value of the device.

In conjunction with the foregoing possible implementation manner, in a third possible implementation manner of the fifth aspect, the device further includes: a first receiving unit, configured to receive, by the network device, before the detecting unit detects the first TA indication information The first indication information is used to indicate that the first terminal device is a terminal device of the first type, where the terminal device of the first type is obtained from the TA indication information sent by the terminal device of the second type A terminal device of the TA value, the terminal device of the second type being a terminal device that acquires a TA value from the network device.

In conjunction with the foregoing possible implementation manner, in a fourth possible implementation manner of the fifth aspect, the first receiving unit is configured to receive the first indication information that is sent by the network device in a random access procedure.

With reference to the foregoing possible implementation manner, in a fifth possible implementation manner of the foregoing aspect, the device further includes: a first acquiring unit, configured to acquire the first terminal device from the network device if the first terminal device is out of synchronization a TA value of a terminal device; the detecting unit is further configured to continue to detect the first TA indication information.

In combination with the foregoing possible implementation manner, in a sixth possible implementation manner of the fifth aspect, the detecting unit is further configured to: when the initial access network device is switched from the sleep state to the connected state, detecting the second TA indication information, The second TA indication information is sent by a third terminal device that has been determined to be the second type of terminal device, and the second TA indication information is used to indicate the third terminal device The determining unit is further configured to determine that the first terminal device is a terminal device of the first type if the detecting unit detects the second TA indication information within a preset time period.

With reference to the foregoing possible implementation manner, in a seventh possible implementation manner of the foregoing aspect, the device further includes: a second acquiring unit, configured to acquire the first terminal device from the network device if the first terminal device is out of synchronization The TA value of a terminal device.

In conjunction with the foregoing possible implementation manner, in an eighth possible implementation manner of the fifth aspect, the detecting unit is specifically configured to: detect the first TA indication information on a D2D broadcast channel.

In conjunction with the foregoing possible implementation manner, in a ninth possible implementation manner of the fifth aspect, the device further includes: a second receiving unit, configured to receive, by the network device, before the detecting unit detects the first TA indication information a second indication information, where the second indication information is used to indicate at least one of a transmission resource, a transmission power, and a transmission manner of the first TA indication information, where the detection unit is specifically configured to receive the first The second indication information is used to detect the first TA indication information.

In conjunction with the foregoing possible implementation manner, in a tenth possible implementation manner of the fifth aspect, the device is the first terminal device.

According to a sixth aspect, a communication apparatus is provided, including: an acquiring unit, configured to acquire a TA value of the second terminal device from the network device; and a sending unit, configured to send the first TA indication information to the first terminal device, where The first TA indication information is used to indicate the TA value acquired by the acquiring unit.

In a first possible implementation manner of the sixth aspect, the first TA indication information is further used to indicate a serving cell of the second terminal device.

In conjunction with the foregoing possible implementation manner, in a second possible implementation manner of the sixth aspect, the device further includes: a first receiving unit, configured to: before the acquiring unit acquires the TA value of the second terminal device from the network device, And receiving, by the network device, first indication information, where the first indication information is used to indicate that the second terminal device is a second type of terminal device, and the second type of terminal device is a terminal device that acquires a TA value from the network device .

In conjunction with the foregoing possible implementation manner, in a third possible implementation manner of the sixth aspect, the first receiving unit is configured to receive the first indication information that is sent by the network device in a random access procedure.

In a fourth possible implementation manner of the foregoing aspect, the device further includes: a detecting unit, configured to: before the acquiring unit acquires the TA value of the second terminal device from the network device, in the initial Detecting the second TA indication information when accessing the network device or switching from the sleep state to the connection state, where the second TA indication information is determined by the terminal determined to be the second type The third terminal device sends, and the second TA indication information is used to indicate the TA value of the third terminal device; and the determining unit is configured to: if the detecting unit does not detect the second TA within the preset time period And indicating information that the second terminal device is a second type of terminal device.

In conjunction with the foregoing possible implementation manner, in a fifth possible implementation manner of the sixth aspect, the sending unit is specifically configured to send the first TA indication information on a D2D broadcast channel.

In conjunction with the foregoing possible implementation manner, in a sixth possible implementation manner of the sixth aspect, the device further includes: a second receiving unit, configured to: before the sending unit sends the first TA indication information to the first terminal device, Receiving, by the network device, the second indication information, where the second indication information is used to indicate at least one of a transmission resource, a transmission power, and a transmission manner of the first TA indication information; the sending unit is specifically configured to be used according to the second The second indication information received by the receiving unit sends the first TA indication information to the first terminal device.

In conjunction with the foregoing possible implementation manner, in a seventh possible implementation manner of the sixth aspect, the device is the second terminal device.

According to a seventh aspect, there is provided another communication apparatus, comprising: a determining unit, configured to determine a transmission resource of the TA indication information, wherein the TA indication information is sent by the second type of terminal device to the first type of terminal device And the TA indication information is used to indicate a TA value of the second type of terminal device, the second type of terminal device is a terminal device that acquires a TA value from the network device, and the first type of terminal device is from the second A terminal device that obtains a TA value in the TA indication information sent by the terminal device of the type; the sending unit is configured to send the second indication information, where the second indication information is used to indicate the transmission resource of the TA indication information.

In a first possible implementation manner of the seventh aspect, the sending unit is specifically configured to send the second indication information in a broadcast form.

In conjunction with the foregoing possible implementation manner, in a second possible implementation manner of the seventh aspect, the second indication information is further used to indicate a transmit power of the TA indication information, and the determining unit is further configured to send, at the sending unit, Before the two indication information, according to the TA adjustment granularity, the expected transmission distance of the TA indication information is determined, and according to the expected transmission distance, the transmission power of the TA indication information is determined.

In combination with the foregoing possible implementation manner, in a third possible implementation manner of the seventh aspect, the determining unit is further configured to determine that the first terminal device is the first type of terminal device or the second type of terminal device; The sending unit is further configured to send the first indication information to the first terminal device, where the first indication information is used to indicate the type of the first terminal device determined by the determining unit.

In combination with the foregoing possible implementation manner, in a fourth possible implementation manner of the seventh aspect, the sending unit is configured to send the first indication to the first terminal device in a random access process of the first terminal device information.

In conjunction with the foregoing possible implementation manner, in a fifth possible implementation manner of the seventh aspect, the device further includes: a receiving unit, configured to receive uplink information sent by the second terminal device; the determining unit is further configured to receive the The uplink information received by the unit determines that the second terminal device is out of synchronization; the sending unit is further configured to send third indication information to the second terminal device, where the third indication information is used to indicate the determining by the determining unit The second terminal device is out of synchronization.

In conjunction with the foregoing possible implementation manner, in a sixth possible implementation manner of the seventh aspect, the device is the network device.

The eighth aspect provides another communication device, including: a determining unit, configured to determine that the first terminal device is a first type terminal device or a second type terminal device, wherein the second type terminal device is a slave device a terminal device that acquires a TA value, the terminal device is a terminal device that acquires a TA value from the detected TA indication information sent by the second type of terminal device, and the sending unit is configured to send the first indication And the first indication information is used to indicate the type of the first terminal device determined by the determining unit.

In a first possible implementation manner of the eighth aspect, the sending unit is specifically configured to send the first indication information in a random access procedure of the first terminal device.

In conjunction with the foregoing possible implementation manner, in a second possible implementation manner of the eighth aspect, the device is the network device.

The communication method and device provided by the embodiment of the present invention, the first terminal device detects the first TA indication information sent by the second terminal device, where the first TA indication information is used to indicate the TA value of the second terminal device. And the first terminal device determines the TA value of the first terminal device according to the detected first TA indication information, and does not need to directly interact with the network device, and each terminal device in the prior art needs to acquire the TA value by interacting with the network device. Compared with the method, the burden on the network device and the signaling overhead can be reduced, and the overall signaling overhead of the system is reduced.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention or the description of the prior art will be briefly described below. Obviously, the drawings described below are only the present invention. Some embodiments, for those of ordinary skill in the art, do not pay Other drawings can also be obtained from these drawings on the premise of creative labor.

1 is a schematic diagram of a communication system to which an embodiment of the present invention can be applied.

2 is a schematic diagram of a contention transmission unit in the communication system shown in FIG. 1.

FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present invention.

4 is a schematic diagram of an application scenario of an embodiment of the present invention.

FIG. 5 is a schematic diagram of another application scenario of an embodiment of the present invention.

FIG. 6 is a schematic flowchart of another communication method according to an embodiment of the present invention.

FIG. 7 is a schematic flowchart of another communication method according to an embodiment of the present invention.

FIG. 8 is a schematic flowchart of another communication method according to an embodiment of the present invention.

FIG. 9 is a schematic flowchart of another communication method according to an embodiment of the present invention.

FIG. 10 is a schematic flowchart of another communication method according to an embodiment of the present invention.

FIG. 11 is a schematic block diagram of a communication apparatus according to an embodiment of the present invention.

FIG. 12 is a schematic block diagram of another communication apparatus according to an embodiment of the present invention.

FIG. 13 is a schematic block diagram of another communication apparatus according to an embodiment of the present invention.

FIG. 14 is a schematic block diagram of another communication apparatus according to an embodiment of the present invention.

FIG. 15 is a schematic block diagram of another communication apparatus according to an embodiment of the present invention.

FIG. 16 is a schematic block diagram of another communication apparatus according to an embodiment of the present invention.

FIG. 17 is a schematic block diagram of another communication apparatus according to an embodiment of the present invention.

FIG. 18 is a schematic block diagram of another communication apparatus according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, such as a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, and a wideband code. Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) System, LTE time division duplex (Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, and future 5G communication systems.

It should also be understood that the technical solution of the embodiments of the present invention can also be applied to various communication systems based on non-orthogonal multiple access technologies, such as a sparse code multiple access (SCMA) system, of course, SCMA is The field of communication may also be referred to as other names; further, the technical solution of the embodiments of the present invention may be applied to a multi-carrier transmission system using non-orthogonal multiple access technology, for example, orthogonal using non-orthogonal multiple access technology Orthogonal Frequency Division Multiplexing (OFDM), Filter Bank Multi-Carrier (FBMC), Generalized Frequency Division Multiplexing (GFDM), Filtered Orthogonal Frequency Division Multiplexing ( Filtered-OFDM, F-OFDM system, etc.

It should also be understood that, in the embodiment of the present invention, the terminal device may communicate with one or more core networks via a Radio Access Network (RAN), and the terminal device may be referred to as an access terminal and a user equipment (User Equipment, UE), subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user equipment. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication. Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks, or terminals in the future evolution of the Public Land Mobile Network (PLMN) Equipment, etc.

It should also be understood that, in the embodiment of the present invention, the network device may be used to communicate with the terminal device, and the network device may be a base station (Base Transceiver Station, BTS) in the GSM system or the CDMA system, or may be a base station in the WCDMA system ( NodeB, NB), may also be an evolved base station (Evolutional Node B, eNB or eNodeB) in the LTE system, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, or a network in a future 5G network. A side device or a network device in a future evolved PLMN network.

Existing cellular communication systems, such as GSM, WCDMA, LTE, etc., support communications primarily for voice and data communications. In general, a traditional base station supports a limited number of connections and is easy to implement.

The next-generation mobile communication system will not only support traditional communication, but also support Machine to Machine (M2M) communication, or Machine Type Communication (MTC) communication. According to forecasts, by 2020, the number of MTC devices connected to the network will reach 500 to 100 billion, which will far exceed the current number of connections. For M2M services, due to the wide variety of services, there is a big difference in network requirements. In general, there are several requirements: (I) reliable transmission, but not sensitive to delay; (II) low latency, high reliability transmission.

It is easier to handle for services that are reliable and not sensitive to latency. However, for low-latency, high-reliability transmission-type services, not only transmission delays but also reliable requirements, such as vehicle to vehicle (V2V) services, are required. If the transmission is unreliable, it will cause retransmission and the transmission delay will be too large to meet the requirements.

Due to the existence of a large number of connections, there is a big difference between future wireless communication systems and existing communication systems. A large number of connections require more resources to access the terminal device and need to consume more resources for the transmission of scheduling signaling related to the data transmission of the terminal device.

FIG. 1 is a schematic structural diagram of a system 100 to which an embodiment of the present invention can be applied. The system 100 includes a network device 102 and a plurality of terminal devices 104-114 located within the coverage of the network device 102, wherein the network device 102 can be respectively connected to the plurality of terminal devices by wireless connection or wired connection or other means. And the network device 102 can support simultaneous transmission of multiple cellular carriers. FIG. 1 exemplarily shows one network device and six terminal devices. Alternatively, the system 100 may include multiple network devices and may include other numbers of terminal devices within the coverage of each network device. This example does not limit this.

The network in the embodiment of the present invention may refer to a PLMN or a D2D network or an M2M network or other network. FIG. 1 is only a simplified schematic diagram of an example, and the network may also include other network devices, which are not shown in FIG.

In order to solve a large number of MTC-type services of the network in the future, and to satisfy low-latency, highly reliable service transmission, the network device 102 in the system 100 can adopt a Grant Free transmission scheme, which can be applied to uplink data transmission. In the unlicensed transmission mechanism, the terminal device does not need to request the network device to allocate transmission resources through the scheduling request mode, but directly contends for resources and performs uplink data transmission, thereby reducing system signaling overhead and reducing transmission delay.

An unauthorized transfer can be understood as any one or more of the following meanings, or as a combination of some of the various technical meanings:

1. Unauthorized transmission can mean that the network device pre-allocates and informs the terminal device of multiple transmission resources. When the terminal device has an uplink data transmission requirement, at least one transmission resource is selected from a plurality of transmission resources pre-allocated by the network device, and the uplink data is sent by using the selected transmission resource; the network device is in the pre-assigned multiple transmission resources. The uplink data sent by the terminal device is detected on at least one transmission resource. The detection may be blind detection, or may be detected according to one of the control domains in the uplink data, or may be detected by other means.

This blind detection can be understood as the detection of data that may arrive without predicting whether or not data has arrived. This blind detection can also be understood as detection without explicit signaling indication.

2. The unlicensed transmission may be: the network device pre-allocates and informs the terminal device of multiple transmission resources, so that when the terminal device has an uplink data transmission requirement, at least one transmission resource is selected from a plurality of transmission resources pre-allocated by the network device, and The uplink data is sent using the selected transmission resource.

3. The unlicensed transmission may be: the terminal device acquires information of a plurality of pre-assigned transmission resources, and when there is an uplink data transmission requirement, selects at least one transmission resource from the plurality of transmission resources, and sends the selected transmission resource by using the selected transmission resource. Upstream data. The terminal device may obtain information about the multiple transmission resources in multiple manners. For example, the mapping relationship between the terminal device and the transmission resource may be defined in a protocol, or indicated by a network device by an instruction, and the like.

4. The unlicensed transmission may refer to a method for realizing uplink data transmission of the terminal device without dynamic scheduling of the network device. The dynamic scheduling may refer to that the transmission resource of the terminal device needs to pass the signaling through the network device every time. A scheduling method for indicating. Optionally, the transmission resource may be one or more transmission time units of transmission resources after the time when the terminal device receives the signaling. A transmission time unit may refer to a minimum time unit for one transmission, such as a Transmission Time Interval (TTI), the value may be 1 ms, or may be a preset transmission time unit. Optionally, implementing uplink data transmission of the terminal device may be understood as allowing data of two or more terminal devices to perform uplink data transmission on the same time-frequency resource.

5. Unauthorized transmission may refer to: the terminal device performs uplink data transmission without requiring network device authorization. The authorization may be that the terminal device sends an uplink scheduling request to the network device, and after receiving the scheduling request, the network device sends an uplink grant (UL grant) to the terminal device, where the uplink grant is used to indicate the uplink transmission allocated to the terminal device. Resources.

6. The unlicensed transmission may be a competitive transmission mode. Specifically, multiple terminal devices may simultaneously perform uplink data transmission on the same time-frequency resources allocated in advance, without requiring network devices to perform authorization.

Optionally, the foregoing data may be included in service data or signaling data.

In the unlicensed transmission mechanism, the transmission resources may include, but are not limited to, a combination of one or more of the following resources: time domain resources, such as radio frames, subframes, symbols, etc.; frequency domain resources, such as subcarriers, resource blocks, etc. ; airspace resources, such as transmit antennas, beams, etc.; code domain resources, such as Sparse Code Multiple Access (SCMA) codebook group, Low Density Signature (LDS) group, CDMA code group, etc. Uplink pilot resources.

The above transmission resources may be transmitted according to, but not limited to, the following control mechanisms: uplink power control, such as uplink transmission power upper limit control, etc.; modulation and coding mode setting, such as transmission block size, code rate, modulation order setting, etc.; retransmission mechanism For example, Hybrid Automatic Repeat Request (HARQ).

In the unlicensed transmission mechanism, at least one contention access zone (CAR) is defined in the time frequency domain, where the CAR can refer to a time-frequency zone for unauthorized transmission, and different CARs can respectively correspond to different Time-frequency resources, and each CAR may further include at least one Contention Transmission Unit (CTU), and accordingly, the CAR may also be referred to as a CTU access area. The CTU may be a basic transmission resource unit of the unlicensed transmission, and the CTU may be a combination of at least one of time, frequency, code, and pilot resources. For example, the CTU may be a combination of time, frequency, and code domain resources. The transmission resource may be a transmission resource composed of a combination of time, frequency, and pilot resources, or may be a transmission resource composed of a combination of time, frequency, code domain, and pilot resources, but the embodiment of the present invention is not limited thereto. . Patent Application No. PCT/CN2014/073084, entitled "System and Method for Uplink Grant-free Transmission Scheme", provides a technical solution for grant-free transmission, in which transmission resources can be divided into different CTUs, each The CTUs may be assigned a set of codes, and the assigned set of codes may be a set of CDMA codes, or may be an SCMA codebook set or an LDS group or a signature group, etc., and optionally, each code may correspond to a set of guides. frequency.

After accessing the network device 102, the terminal device 104-114 may report its own capability information to the network device 102, where the capability information may include information indicating whether the device has the capability of unauthorized transmission. In this way, the network device 102 can communicate with the terminal device by using an unlicensed transmission mechanism or a traditional request-authorization mechanism according to the capability information reported by each terminal device. Optionally, the network device 102 can notify the terminal device of the necessary information for the unlicensed transmission. For example, the network device 102 can instruct the terminal device to perform the unlicensed transmission, and send the search space information, the CAR information, the CTU information, and the modulation and coding manner to the terminal device. Information, etc., where each terminal device is Map to one or more CTUs that can be predefined or configured by a network device. The terminal device may select one code and one pilot in the pilot group corresponding to the code for uplink transmission, but the embodiment of the present invention does not limit this.

The content of the application of PCT/CN2014/073084 is also to be understood as a part of the content of the embodiments of the present invention by way of example.

It should be understood that the embodiment of the present invention is mainly applied to the unlicensed transmission scenario shown in FIG. 1 and FIG. 2, but can also be applied to other communication systems except FIG. 1, which is not limited by the embodiment of the present invention.

Figure 2 exemplarily shows four CARs 1002-1008, wherein the system available bandwidth is divided into a plurality of different time frequency regions, each CAR occupies a different resource block, wherein, optionally, each CAR occupancy The number of resource blocks can be predefined, for example, the resource block Resource Block, RB) 1-4 of the CAR 1002 occupied frequency band. As shown in FIG. 2, each CAR may be further divided into at least one CTU, where each CTU is a combination of a specific time, frequency, signature, and pilot. Each CAR in FIG. 2 corresponds to the same CTU mapping relationship, where It is to be noted that the mapping relationship of four CARs is respectively shown from different angles, but the embodiment of the present invention is not limited thereto. As shown in FIG. 2, each CAR supports six signatures (S1-S6), and each signature can correspond to six pilots, thus constituting 36 pilots (P1-P36), corresponding to 36 CTUs, but The embodiment of the invention is not limited thereto.

It should be understood that FIG. 2 exemplarily shows four CARs and each CAR includes 36 CTUs, but embodiments of the present invention may also include other numbers of CARs and each CAR may include other numbers of CTUs, embodiments of the present invention There is no limit to this.

FIG. 3 shows a communication method 200 provided by an embodiment of the present invention. The method 200 can be performed by a first terminal device.

S210. The first TA indication information is detected, where the first TA indication information is sent by the second terminal device, and the first TA indication information is used to indicate the TA value of the second terminal device.

In the embodiment of the present invention, a plurality of terminal devices in the network are divided into two types, namely, a first type of terminal device and a second type of terminal device, wherein the second type of terminal device acquires its own TA from the network device. And the TA indication information for indicating the TA value of itself is transmitted to the terminal device of the first type in a unicast, multicast or broadcast manner. The first type of terminal device detects the TA indication information sent by the second type of terminal device, and determines its own TA value according to the detected TA indication information.

The first terminal device may determine that it is a first type of terminal device or a second type of terminal device. If the first terminal device determines that it is the first type of terminal device, the first terminal The terminal device can monitor the TA indication information sent by the terminal device of the second type, where the second terminal device can be the terminal device of the second type, which is not limited in this embodiment of the present invention.

Optionally, the first terminal device can perform blind detection, that is, the first terminal device does not know the sender, and the first terminal device does not know in advance which second terminal device is specifically The terminal device, in addition, optionally, the first terminal device may detect the first TA indication information by using a specific transmission resource, for example, continuously or periodically detecting the first TA indication information on the D2D transmission resource. In the embodiment of the present invention, the transmission resource may be a combination of at least one of time, frequency, space, code, and pilot. The specific transmission resource may be predefined or may be obtained from signaling sent by the network device. Or, the method is not limited to the embodiment of the present invention.

S220. Determine, according to the detected first TA indication information, a TA value of the first terminal device.

If the first terminal device detects the first TA indication information sent by the second terminal device (ie, the second terminal device), the first terminal device may determine, according to the detected first TA indication information, The TA value, wherein detecting the first TA indication information may indicate that the first TA indication information is successfully received, but the embodiment of the present invention is not limited thereto. Specifically, if the first terminal device has previously acquired the TA value and obtains uplink synchronization with the network device, the first terminal device may update the first terminal device according to the detected first TA indication information. If the first terminal device does not obtain any TA value before, the current TA value of the first terminal device may be determined as the TA value indicated by the detected first TA indication information, and the The TA value obtains uplink synchronization with the network device, but the embodiment of the present invention is not limited thereto.

Therefore, the communication method provided by the embodiment of the present invention detects the first TA indication information sent by the second terminal device by using the first terminal device, where the first TA indication information is used to indicate the TA value of the second terminal device, and the The first terminal device determines the TA value of the first TA according to the detected first TA indication information, and does not need to directly interact with the network device, and each terminal device in the prior art needs to obtain a TA value by interacting with the network device. Compared, it can reduce the burden of network equipment and signaling overhead, and reduce the overall signaling overhead of the system.

In the embodiment of the present invention, the terminal device of the second type can obtain its own TA value by signaling interaction with the network device. As an optional embodiment, the second type of terminal device may obtain its own TA value from the network device in a closed loop manner, for example, the second type of terminal device sends uplink information to the network device, and the network device may pass the The uplink information is measured, and an uplink synchronization deviation between the terminal device and the network device is obtained, and is sent to the terminal device. a TA command, where the TA command is used to indicate a TA value of the terminal device. Specifically, the TA command may include a current TA value of the terminal device, an adjustment amount of the TA value, or an adjustment step of the TA value, and the like. However, embodiments of the invention are not limited thereto.

The first type of terminal device does not need to directly interact with the network device, but acquires its own TA value from the second type of terminal device. Therefore, each terminal device in the prior art needs to directly interact with the network device. Compared with obtaining the TA value of the device, the embodiment of the present invention can reduce the burden and signaling overhead of the network device. In addition, in the embodiment of the present invention, the terminal device of the first type can obtain its own TA value in an open loop manner, and can further reduce the system compared with the TA value obtained by the terminal device in the prior art in a closed loop manner. Signaling overhead.

For convenience of description, in the following description, the terminal device of the first type is simply referred to as a coarse TA device, and the terminal device of the second type is simply referred to as a fine TA device, but the embodiment of the present invention is not limited to this name.

As an optional embodiment, S220, determining, according to the detected first TA indication information, the TA value of the first terminal device, including:

The TA value indicated by the detected first TA indication information is determined as the TA value of the first terminal device.

Optionally, the first terminal device may also determine its own TA value by using other methods. For example, the first terminal device may perform operation on the TA value indicated by the detected first TA indication information, for example, adding one. The amount of the adjustment is obtained, and the TA value of the self is obtained, which is not limited by the embodiment of the present invention.

As shown in FIG. 4, the network device may provide services for multiple terminal devices, where at least one of the multiple terminal devices may be a fine TA device, and the remaining terminal devices are coarse TA devices. FIG. 4 exemplarily shows three fine TA devices: terminal A, terminal B, and terminal C, wherein the three fine TA devices can obtain their own current TA value by performing signaling interaction with the network device. And broadcast TA indication information indicating its current TA value. The coarse TA device can obtain its current TA value by listening to the TA indication information. For example, the coarse TA device located in the broadcast range of the terminal A may receive the TA indication information sent by the terminal A, and optionally determine the TA value indicated by the received TA indication information as its current TA value, such that The terminal A and the coarse TA device located in the broadcast range of the terminal A may use the same TA value, but the embodiment of the present invention is not limited thereto.

Optionally, if a terminal device is not located in the broadcast range of any one of the fine TA devices served by the network device, for example, the terminal D is located outside the broadcast range of the terminal A, the terminal B, and the terminal C, the terminal device cannot monitor To TA indication information, at this time, although terminal D is a thick TA The device, but the terminal D can still obtain its own TA value through signaling interaction with the network device, but the embodiment of the present invention is not limited thereto.

Optionally, as another optional embodiment, if a coarse TA device is located in the broadcast range of at least two fine TA devices at the same time, for example, the terminal E is located within the broadcast range of the terminal B and the terminal C, The terminal indication information sent by the terminal B and the terminal C is monitored. At this time, the terminal E can determine the target TA indication information from the two monitored TA indication information, and determine the current TA value according to the target TA indication information. Optionally, the terminal E may determine any one of the two TA indication information as the target TA indication information, or the terminal E may perform decoding processing on the two monitored TA indication information, and the decoding is successful. The TA indication information is determined as the target TA indication information. Alternatively, if the two TA indication information monitored by the terminal E are successfully decoded, the terminal E may determine any one of the TA indication information or the TA indication information with a large received power as the target TA indication information. The embodiment of the invention does not limit this. Optionally, if the interference between the two TA indication information monitored by the terminal E causes the terminal E to correctly decode any one of the TA indication information, the terminal E may obtain the signaling interaction with the network device. The current TA value of the self, but the embodiment of the present invention is not limited thereto.

In the embodiment of the present invention, the fine TA device may periodically or triggerably send the TA indication information, and the fine TA device may send the TA indication information in a unicast, multicast, or broadcast manner, and further, the fine TA device may pass the D2D. The manner in which the TA indication information is sent, for example, the fine TA device may send the TA indication information on a Physical Sidelink Broadcast Channel (PSBCH) or other D2D broadcast channel, but the embodiment of the present invention is not limited thereto. The TA indication information may be used to indicate a current TA value of the fine TA device, where the TA indication information may indicate the current TA value of the fine TA device explicitly or implicitly, for example, the TA indication information may include the fine The current TA value of the TA device or the adjustment information including the TA value of the fine TA device, for example, including the change amount or the change step of the current TA value of the fine TA device with respect to the previous TA value or the reference value, but the present invention The embodiment is not limited to this. In addition, one or more of the transmission resource, the transmission power, and the transmission mode (eg, modulation and coding mode, number of adopted antennas, and the like) used by the fine TA device to transmit the TA indication information may be predefined, or indicated by the network device by signaling. This embodiment of the present invention does not limit this.

In the embodiment of the present invention, the first terminal device may periodically or continuously detect the TA indication information sent by the fine TA device, and further, optionally, S210, detect the first indication information of the TA, The method includes: detecting the first TA indication information on a D2D broadcast channel.

In the implementation of the present invention, the first terminal device can determine its type as the first type or the second type in various manners. For example, the type of the first terminal device may be predefined, for example, determined by whether the first terminal device has the capability as a fine TA device, or the type of the first terminal device may be configured by the network device, or the first The type of the terminal device may be determined by whether the first terminal device can detect the TA indication information sent by the terminal device of the second type in a certain period of time, which is not limited by the embodiment of the present invention. As an alternative embodiment, prior to S210, the method 200 includes:

And receiving the first indication information that is sent by the network device, where the first indication information is used to indicate that the first terminal device is a terminal device of the first type, where the terminal device of the first type is sent from the terminal device of the second type The TA indicates the terminal device that obtains the TA value in the information, and the terminal device of the second type is the terminal device that acquires the TA value from the network device.

At this time, the first terminal device may determine, according to the first indication information, that it is a terminal device of the first type, that is, determine that the first terminal device is a coarse TA device. The network device may send the first indication information to the first terminal device in a unicast manner, or the network device may multicast the first indication information to multiple terminal devices belonging to the first type, or may broadcast the First indication information. In addition, the network device may send the first indication information to the first terminal device in the process of establishing a connection between the first terminal device and the network device, which is not limited in this embodiment of the present invention. As an optional embodiment, the first indication information sent by the receiving network device includes: receiving the first indication information that is sent by the network device in a random access procedure.

For example, the first indication information may be carried in the random access response. In this case, the first indication information may be further used to indicate the initial TA value of the first terminal device, but the embodiment of the present invention is not limited thereto. Table 1 shows an exemplary format of a random access response, wherein the random access response may include a reserved field, a type indication field, and a Timing Advance Command (TAC) field, wherein the type indication field may Used to indicate the type of terminal device, and the TAC field is used to indicate the TA value. Optionally, the type indication field may occupy 1 bit, where the value of the bit is set to 1 to indicate that the terminal device is the second type of terminal device, and the value of the bit is set to 0, indicating that the terminal device is the first One type of terminal device; or vice versa. Optionally, in another embodiment, the random access response carries the type indication field only when the terminal device is the terminal device of the first type or the terminal device of the second type, and the embodiment of the present invention is not limited to this.

It should be understood that Table 1 is for illustrative purposes only and is not to be construed as limiting the embodiments of the invention. For example, Table 1 shows that the type indication field is immediately after the reserved field, but the type indication field may also be located elsewhere in the random access response, and the type indication field occupies one or more bits. Optionally, the random access response may further include other fields, for example, further including a field for indicating an identifier of the terminal device, where the embodiment of the present invention is not limited thereto.

Table 1 Example format of random access response

Reserved

Type indication

Timing advance command

Optionally, if the type of the first terminal device is indicated by the network device, the type of the first terminal device may remain substantially unchanged. For example, when the first terminal device regains uplink synchronization with the network device after uplink out-of-synchronization, or the first terminal device returns from the sleep state to the connected state, the type of the first terminal device may remain unchanged. The embodiment of the present invention does not exclude the case where the type of the first terminal device can be changed under certain specific conditions.

As another optional embodiment, the method 200 further includes: if the first terminal device is out of synchronization, obtaining a TA value of the first terminal device from the network device. Optionally, after the first terminal device acquires the TA value from the network device, the first terminal device may further continue to detect the first TA indication information. Specifically, the first terminal device may continue to detect the TA indication information sent by the second type of terminal device, where the detection may be blind detection, that is, the first terminal device performs detection without knowing the sending end, And the TA value indicated by the first TA indication information detected by the first terminal device in the process of continuing to detect may be different from the TA value indicated by the first TA indication information detected in S220, which is used by the embodiment of the present invention. Not limited.

Specifically, when the first terminal device is out of synchronization, the uplink synchronization with the network device may be regained by performing signaling interaction with the network device, for example, obtaining a TA value by using a closed loop manner. After re-acquiring the uplink synchronization, the first terminal device may still be a coarse TA device, continue to detect the TA indication information sent by the second type of terminal device, and adjust its own TA value according to the detected TA indication information, but The embodiment of the invention is not limited thereto.

As another optional embodiment, the first terminal device may also determine its own type by determining whether there is a fine TA device around. Accordingly, prior to S210, the method 200 includes:

Detecting a second TA indication information when initially accessing the network device or switching from a sleep state to a connection state, the second TA indication information being a third terminal determined by the second type of terminal device And sent by the terminal device, and the second TA indication information is used to indicate a TA value of the third terminal device;

If the second TA indication information is detected within the preset time period, it is determined that the first terminal device is the first type of terminal device.

The first terminal device may determine a configuration of the second type of terminal device to send the TA indication information, and detect the TA indication information sent by the second type of terminal device according to the configuration, where the configuration may be predefined or pre-defined by the network device The configuration of the present invention is not limited thereto. The third terminal device has been determined to belong to the second type, wherein the third terminal device may be any terminal device different from the first terminal device, and the third terminal device may be the same as the second terminal device or Different terminal devices. Optionally, the detection here may be a blind detection, that is, the first terminal device performs the detection without knowing which terminal device the third terminal device is specifically, but the embodiment of the present invention is not limited thereto.

Specifically, when the first terminal device needs to determine its own type, for example, initially accessing the network device or switching from the sleep state to the connected state, the first terminal device may start a timer and start detecting the second type of terminal device sending. The TA indicates information, wherein the duration of the timer (ie, the length of the preset time period) may be predefined or indicated by the network device by signaling. If the first terminal device detects the TA indication information sent by the second type of terminal device before the timer expires, indicating that the first terminal device is located within the broadcast range of a certain fine TA device, the first terminal device may Determining the TA value of the device based on the TA value of the device, without the need to directly interact with the network device. In this case, the first terminal device can determine that it is the terminal device of the first type, that is, the first terminal device is thick. The TA device, and the first terminal device can continue to detect the TA indication information sent by the fine TA device. Optionally, if the first terminal device does not detect the TA indication information sent by any fine TA device when the timer expires, it indicates that the first terminal device is not located in the broadcast range of any one of the fine TA devices, The first terminal device may determine that it is a second type of terminal device, that is, the first terminal device is a fine TA device, and the first terminal device may obtain its own TA value from the network device, but the embodiment of the present invention Not limited to this.

The first terminal device may perform the foregoing process to determine its own type only after initially accessing the network device, and the type may remain unchanged after the determining; or the first terminal device may also cycle after accessing the network device. The above process is performed sexually or in a triggered manner to determine the type of itself. For example, if the first terminal device is restored to the connected state by the sleep state (not receiving the message), the first terminal device may perform the above process to determine the type of itself; or, if the first terminal device goes out of synchronization, You can perform the above process to determine the type of itself, and so on, However, embodiments of the invention are not limited thereto.

Optionally, if the first terminal device determines that it is the first type of terminal device at the first moment, and needs to re-determine its own type at the second time, for example, switching from the sleeping state to the connected state or uplink When the step is out of synchronization, the first terminal device may re-execute the foregoing process of detecting the second TA indication information and determining whether the second TA indication information is detected within a second time period of a specific duration; if the first terminal device is in the first If the second TA indication information is detected in the second time period, the first terminal device is still the first type of terminal device; and if the first terminal device does not detect the second TA indication information in the second time period, The first terminal device is changed from the first type of terminal device to the second type of terminal device. In this case, the type of the first terminal device is variable, but the embodiment of the present invention does not limit this.

As another optional embodiment, the method 200 further includes: if the first terminal device is out of synchronization, obtaining a TA value of the first terminal device from the network device. Optionally, after acquiring the TA value from the network device, the first terminal device may still be the first type of terminal device, or may determine that the first terminal device is changed from the first type of terminal device to the second type. Terminal device, or the network device may re-determine the type of the first terminal device and notify the first terminal device, or the first terminal device may re-execute the detection process of the TA indication information to determine its own type, the present invention The embodiment does not limit this.

In the embodiment of the present invention, the first terminal device may determine the uplink out-of-synchronization in multiple manners. Optionally, the first terminal device may determine the uplink out-of-synchronization by itself. For example, the first terminal device may reset the time alignment timer after acquiring the initial TA value or adjusting its own TA value, and determining at the time. Before the timer expires, it is determined whether the TA adjustment information is obtained. If the TA adjustment information is not obtained, it is determined that the first terminal device is out of synchronization. Optionally, in another embodiment, the first terminal device may receive the third indication information that is sent by the network device, where the third indication information is used to indicate that the first terminal device is out of synchronization, and according to the third indication. The information determines the upstream out of step. For example, the network device may measure uplink information (such as uplink data or a reference signal such as a demodulation reference signal) sent by the first terminal device to determine an uplink synchronization deviation between the first terminal device and the network device. If the uplink synchronization deviation exceeds the maximum allowable range, the network device determines that the first terminal device is out of synchronization, and notifies the first terminal device by explicit or implicit manner, but the embodiment of the present invention is not limited thereto.

In the embodiment of the present invention, the first terminal device detects that the second TA indication information and/or the transmission resource of the first TA indication information may be predefined, or detects the second TA indication information and/or Before the first TA indication information, the first terminal device may further receive the second indication information that is sent by the network device, where the second indication information is used to indicate the transmission resource of the second TA indication information and/or the first TA indication information. Correspondingly, the first terminal device may detect the second TA indication information and/or the first TA indication information by using the transmission resource. The first terminal device may receive the second indication information in a random access process or after accessing the network device, and the second indication information and the first indication information may be sent in the same or different messages, the present invention The embodiment does not limit this.

As an optional embodiment, before S210, the method 200 further includes:

Receiving, by the network device, second indication information, where the second indication information is used to indicate at least one of a transmission resource, a transmission power, and a transmission manner of the first TA indication information;

Correspondingly, in S210, detecting the first TA indication information includes: detecting, according to the second indication information, the first TA indication information.

Specifically, the first terminal device may detect the first TA indication information by using the transmission resource indicated by the second indication information, where the transmission resource may include at least one of time, frequency, space, code, and pilot. The first terminal device may further detect the first TA indication information according to at least one of a transmission power and a transmission mode indicated by the second indication information, but the embodiment of the present invention is not limited thereto. Optionally, the second indication information is further used to indicate other configurations of the first TA indication information, and the embodiment of the present invention is not limited thereto. Optionally, the first TA indication information and the second TA indication information may have the same configuration, or the first TA indication information and the second TA indication information have different configurations, and the second indication information may be Further, the configuration of the second TA indication information, such as the transmission resource, the transmission power, the transmission mode, or the length of the timer (that is, the length of the preset time period), and the like, are not limited thereto.

In the embodiment of the present invention, the transmit power (hereinafter referred to as the TA broadcast power) used when the TA device sends the TA indication information may be specified by the standard, or may be pre-configured by the network device. The setting of the TA broadcast power can consider the following factors: On the one hand, the TA broadcast power can be as large as possible to cover more coarse TA devices, thereby minimizing the burden and overhead of the network device in maintaining the TA; on the other hand, TA The broadcast power needs to be such that the coarse TA device located within the transmission distance of the TA indication information can perform uplink synchronization using the same TA value, that is, the TA broadcast power needs to meet the requirement of the TA adjustment granularity. Specifically, taking the TA accuracy in the LTE standard as an example, the TA adjustment granularity is 16T _s , where T _s is the system sampling interval, so that the TA adjustment granularity of the LTE system is about 0.52 μs, and the corresponding signal transmission distance is about 78. Meter. This means that in the LTE system, terminal devices within 78 meters can use the same TA value. Therefore, the fine TA device in the LTE system can control the TA broadcast power such that the transmission distance of the TA indication information is less than 78 meters. Similarly, the fine TA device in the GSM system can control the TA broadcast power according to the TA adjustment granularity of the GSM system, so that the transmission distance of the TA indication information transmitted by the fine TA device is within 550 meters. Optionally, in the embodiment of the present invention, other factors may be considered when determining the broadcast power of the TA, which is not limited by the embodiment of the present invention.

As an optional embodiment, the second indication information may be carried in a System Information Block (SIB) 2. An exemplary structure of SIB2 is shown below, in which a sidelinkPowerControlCommon field is added in the radioResourceConfigCommonSIB field of SIB2, and the power control information of the TA indication information is carried in the newly added sidelinkPowerControlCommon. Optionally, the SIB2 may also have other formats, and the power control information may also be carried in other fields of the SIB2, which is not limited by the embodiment of the present invention.

Among them, the SidelinkPowerControlCommon field can have the following format:

SidelinkPowerControlCommon::=SEQUENCE{

p0-NominalPSBCH INTEGER(-126..24),

}

The field p0-NominalPSBCH INTEGER carries power control information, but the embodiment of the present invention is not limited thereto.

Figure 5 shows a scenario of a terminal device located at the edge of a cell. As shown in Figure 5, terminals a and b At the edge of cell A and cell B, and reside in cell B. The terminal d residing in the cell A and the terminal e residing in the cell B are fine TA devices, and the remaining terminals are coarse TA devices. The terminal a is located at the edge of the broadcast range of the terminal d and is located outside the broadcast range of the terminal e. Therefore, the terminal a can receive the TA indication information broadcast by the terminal d, but cannot receive the TA indication information broadcast by the terminal e. The terminal b is located in the overlapping area of the broadcast range of the terminal d and the terminal e. Therefore, the terminal b can receive the TA indication information broadcast by the terminal d or the TA indication information broadcast by the terminal e. At this time, the terminals a and b may use the TA indication information sent by the fine TA device residing in the cell A to establish uplink synchronization with the network device B to cause uplink synchronization failure.

In order to avoid the occurrence of the foregoing situation, optionally, when the terminal device initially accesses the cell B, the network device B may notify the terminal device in the random access process of the transmission resource used by the fine TA device in the local cell to send the TA indication information. . In addition, multiple cells may perform joint scheduling such that the TA indication information in each cell occupies different transmission resources. In this way, the terminal device can detect the TA indication information by using a transmission resource (for example, a time-frequency resource) corresponding to the resident cell. As another optional embodiment, the TA indication information broadcast by the fine TA device may also be used to indicate a cell identifier corresponding to the TA value. At this time, after receiving the TA indication information sent by a certain fine TA device, the coarse TA device may decode the received TA indication information to obtain a cell identifier indicated by the TA indication information, and determine the cell identifier. Whether the corresponding cell is the current camping cell of the coarse TA device, and if yes, the uplink value of the network device may be completed by using the TA value indicated by the TA indication information; otherwise, the coarse TA device may discard the TA indication. Information, but the embodiment of the invention is not limited thereto.

Optionally, the first TA indication information is further used to indicate a serving cell of the second terminal device, that is, a cell corresponding to the TA value, and correspondingly, S220, determining, according to the detected first TA indication information, the first The TA value of a terminal device, including:

If the current serving cell of the first terminal device is the same as the serving cell indicated by the first TA indication information, determining the TA value of the first terminal device according to the detected first TA indication information.

In this case, the first TA indication information may be used to indicate a TA value of the second terminal device and a cell corresponding to the TA value. For example, the first TA indication information includes an identifier of a cell corresponding to the TA value, optionally, The first TA indication information may further include other information, but the embodiment of the present invention is not limited thereto.

The first terminal device may determine the cell indicated by the detected first TA indication information. Whether it is the current serving cell of the first terminal device, if yes, the first terminal device may determine its own TA value according to the detected first TA indication information; if not, the first terminal device may discard The first TA indicates information, but the embodiment of the present invention is not limited thereto. In this way, it is possible to prevent the terminal a or b in FIG. 5 from using the TA indication information sent by the terminal d to perform uplink synchronization failure with the network device B for uplink synchronization failure.

FIG. 6 shows a communication method 300 provided by another embodiment of the present invention. The method 300 can be performed by a second terminal device.

S310. Acquire a TA value of the second terminal device from the network device.

The second terminal device may acquire its own TA value from the network device when determining that it is the second type of terminal device. Optionally, the second terminal device may obtain the TA value from the network device in a closed loop manner, but the embodiment of the present invention is not limited thereto.

S320. The first TA indication information is sent to the first terminal device, where the first TA indication information is used to indicate a TA value of the second terminal device.

The first terminal device is a first type of terminal device. Optionally, the second terminal device may send the first TA indication information to the first terminal device in a unicast manner, or may be first to the multicast mode. The at least one terminal device of the type sends the first TA indication information, or the first TA indication information may be sent in a broadcast manner, and the embodiment of the present invention is not limited thereto.

Therefore, the communication method provided by the embodiment of the present invention acquires its own TA value from the network device by using the second terminal device, and sends a first TA indication information indicating the TA value of the self to the first terminal device, so that the first The terminal device can determine the value of the TA according to the first TA indication information, and does not need to directly interact with the network device. Compared with the manner in which each terminal device in the prior art needs to obtain the TA value by interacting with the network device, Reduce the burden on network equipment and signaling overhead, and reduce the overall signaling overhead of the system.

Optionally, the first TA indication information is further used to indicate a serving cell of the second terminal device.

At this time, the first TA indication information may include information about a serving cell of the second terminal device, And a TA value for indicating that the second terminal device maintains uplink synchronization with the serving cell, so that the first terminal device can use the TA value indicated by the first indication information and the service indicated by the first indication information. The cell performs uplink synchronization. Optionally, after receiving the first TA indication information, determining whether the cell indicated by the first TA indication information is the same as the current serving cell of the first terminal device, and if yes, indicating according to the first indication information The TA value determines the TA value of itself, but the embodiment of the present invention is not limited thereto.

In the embodiment of the present invention, the second terminal device can determine its type in various manners. Optionally, before S310, the method 300 further includes:

The first indication information sent by the network device is received, where the first indication information is used to indicate that the second terminal device is a second type of terminal device, and the second type of terminal device obtains a TA value from the network device.

The second terminal device may determine, according to the first indication information, that it is a second type of terminal device. Optionally, the first indication information may further be used to indicate a TA value of the second terminal device, and correspondingly, The second terminal device may determine its own TA value according to the first indication information. Optionally, the first indication information may be explicit or implicitly indicating that the second terminal device is a second type of terminal device, and further, the network device may be in a random access process of the second terminal device or randomly After the access, the first indication information is sent to the second terminal device. Optionally, the receiving the first indication information sent by the network device includes: receiving the first indication information that is sent by the network device in a random access procedure.

For example, the second terminal device may receive the random access response sent by the network device, and the random access response carries the first indication information, but the embodiment of the present invention is not limited thereto.

As another alternative embodiment, before S310, the method 300 further includes:

Detecting, when initially accessing the network device or switching from the sleep state to the connected state, the second TA indication information is sent by the third terminal device that has been determined to be the second type of terminal device, and The second TA indication information is used to indicate a TA value of the third terminal device;

If the second TA indication information is not detected within the preset time period, determining that the second terminal device is the second type of terminal device.

The second terminal device can start the timer and start detecting the TA indication information sent by the terminal device of the second type, where the duration of the timer (that is, the length of the preset time period) can be predefined or passed by the network device. Signaling indication. If the second terminal device does not detect the TA indication information sent by the terminal device of the second type when the timer expires, indicating that there is no other fine TA device around the second terminal device, the second terminal device may determine that it is Second type The terminal device, that is, the second terminal device is a fine TA device. Optionally, the second terminal device can perform blind detection, that is, if the terminal device is not known in advance, which terminal device is specifically known. The configuration of the second TA indication information may be predefined or pre-configured by the network device. Optionally, before detecting the second TA indication information, the second terminal device may further receive second indication information that is sent by the network device, where the second indication information is used to indicate that the second type of terminal device sends the TA indication information. Configuring, for example, at least one of a transmission resource, a transmission power, and a transmission mode, or may further include a duration of the foregoing timer, where the transmission resource may include at least one of time, frequency, space, code, and pilot The second terminal device may detect the second TA indication information by using the configuration indicated by the second indication information, but the embodiment of the present invention is not limited thereto.

The second terminal device may perform the foregoing process to determine its type only after initially accessing the network device, and the type may remain unchanged after the determining; or the second terminal device may also cycle after accessing the network device. The above process is performed sexually or in a triggered manner to determine the type of itself. For example, if the second terminal device is restored from the sleep state to the connected state, the second terminal device may perform the foregoing process to determine its own type; or, if the second terminal device is out of synchronization, the foregoing process may be performed. The type of itself is determined, and the like, but the embodiment of the invention is not limited thereto.

Optionally, if the second terminal device determines that it is the second type of terminal device at the first moment, and needs to re-determine its own type at the second time, for example, switching from the sleeping state to the connected state or uplink When the step is out of synchronization, the second terminal device may re-execute the foregoing process of detecting the second TA indication information and determining whether the second TA indication information is detected within a second time period of the specific duration; if the second terminal device is in the If the second TA indication information is not detected in the second time period, the second terminal device is still the second type of terminal device; and if the second terminal device detects the second TA indication information in the second time period, The second terminal device is changed from the second type of terminal device to the first type of terminal device. In this case, the type of the second terminal device is variable, but the embodiment of the present invention does not limit this.

In the embodiment of the present invention, the second terminal device may send the first TA indication information in multiple manners. Optionally, the sending, by the S320, the first TA indication information to the first terminal device, including: sending the first TA indication information on the D2D broadcast channel.

The second terminal device may send the first TA indication information in a D2D manner. For example, the second terminal device may send the first TA indication information on a PSBCH or other D2D broadcast channel. However, embodiments of the invention are not limited thereto.

In addition, the second terminal device may periodically send the first TA indication information, where the sending period may be predefined or pre-configured by the network device, or the second terminal device may trigger the first TA indication information. For example, the second terminal device may send the first TA indication information when its own TA value is adjusted, but the embodiment of the present invention is not limited thereto.

The configuration in which the second terminal device sends the first TA indication information may be predefined or indicated by the network device. As an optional embodiment, before S320, the method 300 further includes:

Correspondingly, the S320 sends the first TA indication information to the first terminal device, including:

And transmitting the first TA indication information to the first terminal device according to the second indication information.

The second terminal device may send the first TA indication information to the first terminal device by using at least one of a transmission resource, a transmission power, and a transmission manner indicated by the second indication information.

In the embodiment of the present invention, the fine TA device may perform the following processing before sending the TA indication information:

(1) Scrambling

For the information bit sequence b(0), ..., b(M _b -1) to be transmitted, where M _b represents the number of bits included in the TA indication information. The fine TA device can scramble the sequence c(i) to obtain the scrambled bit sequence.

among them,

(2) Modulation

Fine TA device pair bit sequence after scrambling

Modulation is performed to obtain a complex-valued modulation symbol sequence d(0), ..., d(M _s -1), where M _s is the number of complex-valued symbols included in the complex-valued symbol sequence. Optionally, if the fine TA device sends the TA indication information on the Physical Sidelink Broadcast Channel (PSBCH), the Quadrature Phase Shift Keying (QPSK) modulation method may be used for modulation. However, this embodiment of the present invention does not limit this.

(3) Layer mapping and precoding

Layer mapping the modulation symbol sequences d(0),...,d(M _s -1) to obtain the symbol sequence x(i)=[x ⁽⁰⁾ (i)...x ^(v-1) ( i)] ^T , where v is the number of layers, i=0, 1, ...,

Is the number of adjustment symbols for each layer of mapping.

Specifically, if an antenna port is used to transmit the TA indication information, then v=1,

The mapping criterion is specifically x ⁽⁰⁾ (i) = d (i).

If transmission diversity is used, then v is equal to the number of antenna ports P of the terminal device used to transmit the physical channel, and the mapping criteria can be as shown in Table 2.

Table 2 Example of layer mapping modulation symbols in transmission diversity mode

Subsequently, the symbol sequence x(i)=[x ⁽⁰⁾ (i)...x ^(v-1) (i)] ^T can be precoded to obtain the vector y(i)=[...y ^{( p)} (i)...] ^T ,

Specifically, if an antenna port is used for transmission, the output vector y ^(p) (i) = x ⁽⁰⁾ (i), where p is the antenna port number used for physical channel transmission.

If the transmit diversity mode is used, the output vector y(i)=[y ⁽⁰⁾ (i)y ⁽¹⁾ (i)] ^T is used when two antenna ports are used: ports 0 and 1, where the output vector can Obtained by:

When using four antenna ports: port 0-3, the output vector y(i)=[y ⁽⁰⁾ (i)y ⁽¹⁾ (i)y ⁽²⁾ (i)y ⁽³⁾ (i)] ^T , or other numbers of antenna ports or transmission modes may be used, and embodiments of the present invention are not limited thereto.

(4) Map the precoding output vector y(i)=[...y ^(p) (i)...] ^T onto the transmission resource block.

Therefore, the communication method provided by the embodiment of the present invention acquires its own TA value from the network device by using the second terminal device, and sends a first TA indication information indicating the TA value of the self to the first terminal device, so that the first The terminal device can determine its own TA value according to the first TA indication information, and does not need to directly interact with the network device, and each terminal device needs to pass through the prior art. Compared with the manner in which the network device interacts to obtain the TA value, the burden on the network device and the signaling overhead can be reduced, and the overall signaling overhead of the system is reduced.

FIG. 7 illustrates a communication method 400 provided by another embodiment of the present invention. The method 400 can be performed by a network device.

S410. Determine a transmission resource of the TA indication information, where the TA indication information is sent by the second type of terminal device to the first type of terminal device, and the TA indication information sent by the second type of terminal device is used to indicate The TA value of the second type of terminal device.

In the embodiment of the present invention, the first type of terminal device corresponds to the coarse TA device, and the second type of terminal device corresponds to the fine TA device, wherein the fine TA device acquires its own TA value from the network device, and sends the indication The TA indication information of its own TA value. The coarse TA device may detect the TA indication information, and determine its own TA value according to the TA value indicated by the detected TA indication information, for example, determine the TA value indicated by the detected TA indication information as its own TA value.

Optionally, the TA indication information may also be used to indicate the jurisdiction of the second type of the terminal device, such as the cell ID of the serving cell, but the embodiment of the present invention is not limited thereto.

S420: Send second indication information, where the second indication information is used to indicate a transmission resource of the TA indication information.

The network device may send the second indication information to some or all user equipments of the service, for example, the network device may send the second indication information to the at least one terminal device, where the at least one terminal device may include at least one fine TA Equipment and / or at least one coarse TA device. In addition, the network device may send the second indication information in a unicast, multicast, or broadcast manner. For example, the network device may broadcast the second indication information, but the embodiment of the present invention is not limited thereto.

Optionally, the foregoing transmission resource is a transmission resource that can be used for sending or receiving the TA indication information for all terminal devices within the jurisdiction of the network device, that is, the terminal device in the jurisdiction of the network device is the first type of terminal device or the second. The terminal devices of the type all use the same determined transmission resource to transmit or receive the TA indication information. Optionally, the second indication information is further used to indicate a range that is stipulated by the network device. For example, the second indication information includes a cell identifier (Cell ID) of the cell controlled by the network device, but the embodiment of the present invention is not limited thereto. this.

Therefore, the communication method provided by the embodiment of the present invention sends the second indication information for indicating the transmission resource of the TA indication information by the network device, so that the terminal device of the second type sends the TA indication information according to the transmission resource, the first type of The terminal device monitors the TA indication information according to the transmission resource, and can determine its own TA value according to the detected TA indication information, without directly The interaction with the network device can reduce the burden and signaling overhead of the network device and reduce the overall signaling overhead of the system, as compared with the manner in which each terminal device in the prior art needs to obtain the TA value by interacting with the network device.

Optionally, the second indication information is further used to indicate at least one of a transmit power and a transmission manner of the TA indication information. The network device can determine the transmit power of the TA indication information in a plurality of manners. As an alternative embodiment, prior to S420, the method 400 further includes:

Determining a desired transmission distance of the TA indication information according to the TA adjustment granularity;

The transmit power of the TA indication information is determined according to the expected transmission distance.

The expected transmission distance of the TA indication information corresponds to a desired coverage of the TA indication information, and the network device may determine, according to the expected coverage, a transmit power of the TA indication information, so that the coverage of the TA indication information is within the coverage of the TA indication information. A plurality of terminal devices may maintain uplink synchronization with the network device by using the same TA value, but the embodiment of the present invention is not limited thereto.

As another alternative embodiment, the network device can also configure the type of the terminal device. Accordingly, the method 400 further includes:

Determining that the first terminal device is the first type of terminal device or the second type of terminal device;

The first indication information is sent to the first terminal device, where the first indication information is used to indicate that the first terminal device is the first type terminal device or the second type terminal device.

The network device may determine that the first terminal device is the first type of terminal device or the second type of terminal device, for example, the network device may be based on the service type and location information of the first terminal device, One or more of the capability information, the subscription information, and the like, determining that the first terminal device is the first type of terminal device or the second type of terminal device, for example, the network device may have a larger amount of data, The terminal device that transmits data more frequently and has a stable power source determines the fine TA device, and the terminal device that has a smaller amount of data, a lower data transmission frequency, and a limited battery capacity determines the coarse TA device, but the embodiment of the present invention is not limited thereto. After determining the type of the first terminal device, the network device may send, to the first terminal device, first indication information indicating a type of the first terminal device, optionally, the first indication information is further used to: The initial TA value of the first terminal device is indicated, but the embodiment of the present invention is not limited thereto.

The network device may send the first indication information in a plurality of manners. Optionally, the sending the first indication information to the first terminal device, including: performing the first in the random access process of the first terminal device The terminal device sends the first indication information.

As another optional embodiment, the network device may also detect whether a terminal device maintains uplink synchronization, and notify the terminal device when the terminal device is out of synchronization. Accordingly, the method 400 further includes:

Receiving uplink information sent by the second terminal device;

Determining, by the received uplink information, that the second terminal device is out of synchronization;

The third indication information is sent to the second terminal device, where the third indication information is used to indicate that the second terminal device is out of synchronization.

The uplink information may include uplink data or a reference signal, such as a demodulation reference signal, but the embodiment of the present invention is not limited thereto. The network device may measure the uplink information to determine an uplink synchronization deviation between the second terminal device and the network device, and if the uplink synchronization deviation exceeds a threshold, the network device may determine the second terminal device. The uplink is out of synchronization and the second terminal device is notified by signaling. Optionally, the third indication information may be further used to indicate a current TA value of the second terminal device, so that the second terminal device regains the network value with the network device according to the TA value indicated by the third indication information. Uplink synchronization, but embodiments of the present invention are not limited thereto.

Therefore, the communication method provided by the embodiment of the present invention sends the second indication information for indicating the transmission resource of the TA indication information by the network device, so that the terminal device of the second type sends the TA indication information according to the transmission resource, the first type of The terminal device monitors the TA indication information according to the transmission resource, and can determine its own TA value according to the detected TA indication information, and does not need to directly interact with the network device, and each terminal device in the prior art needs to perform with the network device. Compared with the way of obtaining the TA value, the burden of the network device and the signaling overhead can be reduced, and the overall signaling overhead of the system is reduced.

FIG. 8 illustrates a communication method 500 provided by another embodiment of the present invention. The method 500 can be performed by a network device.

S510, determining that the first terminal device is a terminal device of the first type or a terminal device of the second type, where the terminal device of the second type is a terminal device that acquires a TA value from the network device, where the terminal device of the first type is The terminal device that acquires the TA value from the detected TA indication information sent by the terminal device of the second type.

The network device may determine that the type of the first terminal device is the first type or the second type, and notify the first terminal device by signaling.

S520: Send the first indication information, where the first indication information is used to indicate that the first terminal device is the first type terminal device or the second type terminal device.

Specifically, the network device may send the first indication information to the first terminal device.

Optionally, in S520, sending the first indication information includes: sending the first indication information in a random access procedure of the first terminal device.

Therefore, the communication method provided by the embodiment of the present invention configures the terminal device as a terminal device of the first type or a terminal device of the second type by using the network device, where the terminal device of the second type acquires its own TA value from the network device. And transmitting the TA indication information for indicating the TA value of the first type to the terminal device, so that the terminal device of the first type can determine the TA value of the first type according to the detected TA indication information, without directly performing with the network device. The interaction can reduce the burden and signaling overhead of the network device and reduce the overall signaling overhead of the system, as compared with the manner in which each terminal device in the prior art needs to obtain the TA value by interacting with the network device.

The communication method provided by the embodiment of the present invention will be described in more detail below with reference to specific examples. FIG. 9 is a schematic flowchart of another communication method 600 according to an embodiment of the present invention.

S610, the terminal device receives the first indication information sent by the network device during the random access process, and determines, according to the first indication information, that the terminal device is the first type terminal device or the second type terminal device, That is, the terminal device is determined to be a coarse TA device or a fine TA device.

The network device may send the first indication information in a unicast, multicast, or broadcast manner, where the transmission resource used by the network device to broadcast the first indication information may be predefined, but the embodiment of the present invention does not do this. limited. In addition, the first indication information may further be used for one or more of control information including TA indication information, for example, transmission resource, transmission power, and transmission mode (modulation coding mode and number of antenna ports, etc.), optionally The first indication information may also be used to indicate other configurations of the other TA indication information, and the embodiment of the present invention is not limited thereto.

If the terminal device belongs to the fine TA device, the terminal device may complete initial uplink synchronization with the network device in the random access process, obtain its own initial TA value, and the terminal device may perform S620. If the terminal device belongs to a coarse TA device, the terminal device can select whether to obtain an initial TA value in the random access procedure. If the coarse TA device obtains its own initial TA value in the random access process, the coarse TA device may use the initial TA value for data transmission, and execute S630, where the coarse TA device may periodically or continuously monitor the TA. The indication information is adjusted according to the monitored TA indication information, that is, the initial TA value is updated to the TA value indicated by the monitored TA indication information, but the embodiment of the present invention is not limited thereto. Optionally, if the coarse TA device does not obtain the initial TA value in the random access procedure, the coarse TA device may perform S630, and determine its own initial TA value and update the TA value according to the monitored TA indication information, ie, S630 is performed, but the embodiment of the present invention is not limited thereto.

S620. The terminal device broadcasts TA indication information for indicating its own TA value.

S630. Listen to the TA indication information, and obtain the TA value of the TA from the monitored TA indication information.

S640. The terminal device performs data transmission with the network device.

S650: The terminal device determines whether the uplink is out of synchronization.

If the terminal device is uplink synchronized, the terminal device can update its own TA value and maintain uplink synchronization with the network device with the updated TA value. The fine TA device may perform S670 and S630, that is, periodically or triggerably receive the TA update information sent by the network device, update the TA value according to the TA update information, to maintain uplink synchronization with the network device, and periodically or trigger. The TA indication information indicating the current TA value of itself is broadcast sexually. The coarse TA user can maintain uplink synchronization with the network device by executing S630.

If the terminal device is out of synchronization, S660 is performed. Specifically, if the fine TA device is out of synchronization, the fine TA device may stop broadcasting the TA indication information and re-interact with the network device to regain uplink synchronization with the network device, and then may resume broadcasting the TA indication information. If the coarse TA device is out of synchronization, the coarse TA device may also interact with the network device to regain uplink synchronization with the network device, and continue to monitor the TA indication information after regaining the uplink synchronization.

S660: Obtain a TA value from the network device in a closed loop manner, and regain uplink synchronization with the network device.

S670. Receive TA update information sent by the network device, and update the TA value according to the TA update information.

FIG. 10 is a schematic flowchart of another communication method 700 according to an embodiment of the present invention. Different from the manner in which the type of the terminal device in the method 600 is configured by the network device, the method shown in FIG. In 700, the type of the terminal device can be determined by listening to the TA indication information broadcast by other terminal devices.

S710. When the terminal device needs to determine its own type, for example, initially entering the network or waking up from the sleep state, the configuration of the TA indication information may be determined.

Optionally, the terminal device may receive the second indication information that is sent by the network device, where the second indication information is used to indicate the configuration of the TA indication information, for example, at least one of a transmission resource, a transmission power, and a transmission manner of the TA indication information. The length of the timer is further used to instruct the terminal device to detect the TA indication information, which is not limited in this embodiment of the present invention.

S720. The terminal device starts a timer, and detects and receives the TA indication information that may exist according to the configuration of the TA indication information.

The manner in which the terminal device detects the TA indication information and the length of the timer may be predefined or obtained from the second indication information sent by the network device, which is not limited in this embodiment of the present invention.

S730. The terminal device determines whether the TA indication information is detected when the timer expires.

If the terminal device detects the TA indication information, it may be determined that the terminal device is a coarse TA device. Optionally, the coarse TA device may also obtain a TA value from the detected TA indication information, and complete uplink synchronization with the network device. Then, data transfer begins. At the same time, the coarse TA device can perform S750 to maintain uplink synchronization with the network device.

If the terminal device does not detect the TA indication information, it may be determined that the terminal device is a fine TA device, and S740 is performed, but the embodiment of the present invention is not limited thereto.

As another optional embodiment, if the terminal device correctly receives the TA indication information before the timer expires, it indicates that the terminal device is in the coverage of one or some fine TA devices, and the terminal device becomes thick. TA equipment. If the terminal device does not correctly receive any TA indication information before the timer expires, it indicates that the terminal device is not in the broadcast range of other fine TA devices, or is in an overlapping area of the broadcast range of multiple fine TA devices, thus, The TA indication information from a plurality of fine TA device broadcasts interfere with each other such that the terminal device cannot correctly decode the TA indication information broadcast by any one of the fine TA devices, and at this time, the terminal device can become a fine TA device.

S740. The fine TA device obtains its own TA value through interaction with the network device, and broadcasts the TA indication information for indicating its own TA value by using a transmission resource indicated by a predefined or network device and a specific transmission power and transmission manner. .

The fine TA device can determine whether the uplink is out of step. If the fine TA device is out of synchronization during the data transmission process, the broadcast TA indication information may be stopped, and the closed loop interaction with the network device may be performed again. To regain uplink synchronization with network devices.

S750. The coarse TA device may detect the TA indication information on the specific transmission resource, and update its own TA value according to the detected first TA indication information to maintain uplink synchronization with the network device.

S760, the coarse TA device determines whether the uplink is out of step.

If the coarse TA device is uplink synchronized, S750 can be performed continuously or periodically. If the coarse TA device is out of synchronization, the coarse TA device can re-obtain uplink synchronization with the network device by performing closed-loop interaction with the network device, and the coarse TA device automatically transitions to the fine TA device.

Therefore, in this embodiment, the identity type of the terminal device is not fixed, and each terminal device confirms its identity type in the same manner, and can convert the identity type. This embodiment is more applicable to networks of the same type of terminal devices. The probability of becoming a fine TA device or a coarse TA device is basically the same between the devices, and thus is more fair.

It should be noted that the examples of FIG. 9 and FIG. 10 are intended to help those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention. A person skilled in the art will be able to make various modifications or changes in the embodiments according to the examples of FIG. 9 and FIG. 10, and such modifications or variations are also within the scope of the embodiments of the present invention.

It should be understood that the size of the sequence numbers of the above processes does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention.

The communication method according to an embodiment of the present invention is described in detail above with reference to FIGS. 1 through 10, and a communication device according to an embodiment of the present invention will be described below with reference to FIGS. 11 through 18.

FIG. 11 shows a communication device 800 according to an embodiment of the present invention. The device 800 includes:

The detecting unit 810 is configured to detect the first TA indication information, where the first TA indication information is sent by the second terminal device, and the first TA indication information is used to indicate the TA value of the second terminal device;

The determining unit 820 is configured to determine a TA value of the first terminal device according to the first TA indication information detected by the detecting unit 810.

Optionally, the first TA indication information is further used to indicate the serving cell of the second terminal device; correspondingly, the determining unit 820 is further configured to: if the current serving cell of the first terminal device and the first TA indication information The indicated serving cell is the same, and the TA value of the first terminal device is determined according to the first TA indication information detected by the detecting unit 810.

Optionally, the determining unit 820 is specifically configured to determine the TA value indicated by the first TA indication information detected by the detecting unit 810 as the TA value of the first terminal device.

The first terminal device may be a first type of terminal device, and the second terminal device may be a second type of terminal device, wherein the second terminal device may acquire its own TA value from the network device.

As an optional embodiment, the apparatus 800 further includes: a first receiving unit, configured to receive first indication information sent by the network device, where the first indication information is used before the detecting unit 810 detects the first TA indication information, where the first indication information is used Instructing the first terminal device to be a terminal device of the first type, wherein the terminal device of the first type is a terminal device that obtains a TA value from the TA indication information sent by the terminal device of the second type, and the terminal device of the second type The device is a terminal device that acquires a TA value from the network device.

Optionally, the first receiving unit is specifically configured to receive the first indication information that is sent by the network device in a random access procedure. At this time, the first receiving unit may receive the first indication information that is sent by the network device in the process that the first terminal device randomly accesses the network device.

Optionally, in another embodiment, the apparatus 800 further includes: a first acquiring unit, configured to acquire a TA value of the first terminal device from the network device if the first terminal device is out of synchronization;

Optionally, the detecting unit 810 is further configured to continue to detect the first TA indication information after the first acquiring unit acquires the TA value from the network device.

As another optional embodiment, the detecting unit 810 is further configured to detect, when the initial access network device is switched from the sleep state to the connected state, the second TA indication information, where the second TA indication information is determined to be Transmitted by the third terminal device of the terminal device of the second type, and the second TA indication information is used to indicate the TA value of the third terminal device;

Correspondingly, the determining unit 820 is further configured to determine that the first terminal device is the first type of terminal device if the detecting unit 810 detects the second TA indication information within a preset time period.

Optionally, in another embodiment, the apparatus 800 further includes: a second acquiring unit, configured to acquire a TA value of the first terminal device from the network device if the first terminal device is out of synchronization.

Optionally, the determining unit 820 is further configured to: when the first terminal device is out of synchronization, determine that the first terminal device is changed from the first type of terminal device to the second type of terminal device.

As another optional embodiment, the detecting unit 810 is further configured to re-detect the second TA indication information when switching from the sleep state to the connected state;

Correspondingly, the determining unit 820 is further configured to: if the detecting unit 810 is not within the preset time period The second TA indication information is detected, and it is determined that the first terminal device is changed from the first type of terminal device to the second type of terminal device.

As another optional embodiment, the detecting unit 810 is specifically configured to: detect the first TA indication information on a D2D broadcast channel.

As another optional embodiment, the apparatus 800 further includes: a second receiving unit, configured to receive second indication information sent by the network device, where the second indication information is used before the detecting unit 810 detects the first TA indication information, where the second indication information is used by the detecting unit 810 At least one of a transmission resource, a transmission power, and a transmission mode indicating the first TA indication information;

Correspondingly, the detecting unit 810 is configured to detect the first TA indication information according to the second indication information received by the second receiving unit.

The communication device 800 according to an embodiment of the present invention may correspond to the first terminal device in the communication method according to an embodiment of the present invention, and the above and other operations and/or functions of the respective modules in the communication device 800 are respectively implemented in order to implement FIG. 3 to The corresponding processes of the respective methods in FIG. 10 are not described herein for the sake of brevity.

Therefore, the communication device provided by the embodiment of the present invention detects the first TA indication information sent by the second terminal device, where the first TA indication information is used to indicate the TA value of the second terminal device, and the first terminal device detects the The first TA indication information is obtained, and the TA value is determined, and the network device is not required to be directly interacted with the network device. Compared with the manner in which each terminal device in the prior art needs to obtain the TA value by interacting with the network device, the network device can be reduced. The burden and signaling overhead reduce the overall signaling overhead of the system.

FIG. 12 shows another communication device 900 according to an embodiment of the present invention. The device 900 includes:

The obtaining unit 910 is configured to acquire a TA value of the second terminal device from the network device.

The sending unit 920 is configured to send the first TA indication information to the first terminal device, where the first TA indication information is used to indicate the TA value acquired by the acquiring unit 910.

The first terminal device may be a first type of terminal device, and the sending unit may send the first TA indication information in a unicast or broadcast manner.

As another optional embodiment, the first TA indication information is further used to indicate a serving cell of the second terminal device.

As another optional embodiment, the apparatus 900 further includes: a first receiving unit, configured to receive first indication information sent by the network device, before the acquiring unit 910 acquires a TA value of the second terminal device from the network device, where The first indication information is used to indicate that the second terminal device is of the second type. Terminal device, the second type of terminal device is a terminal device that acquires a TA value from the network device.

At this time, the device 900 may further include a determining unit, configured to determine, according to the first indication information received by the first receiving unit, that the second terminal device is a second type of terminal device.

As an optional embodiment, the first receiving unit is specifically configured to receive the first indication information that is sent by the network device during a random access procedure. At this time, the first receiving unit is specifically configured to receive the first indication information that is sent by the network device in the process that the second terminal device randomly accesses the network device, for example, the first indication information is carried in a random access response. However, embodiments of the invention are not limited thereto.

As another alternative embodiment, the apparatus 900 further includes:

a detecting unit, configured to detect a second TA indication information when initially accessing the network device or switching from a sleep state to a connection state, where the second TA indication information is determined by the third device that is determined to be the second type of terminal device Transmitted by the terminal device, and the second TA indication information is used to indicate a TA value of the third terminal device;

And a determining unit, configured to determine that the second terminal device is a second type of terminal device if the detecting unit does not detect the second TA indication information within a preset time period.

As another optional embodiment, the detecting unit is further configured to re-detect the second TA indication information when switching from the sleep state to the connected state;

Correspondingly, the determining unit is further configured to: if the detecting unit detects the second TA indication information in the preset time period, determine that the second terminal device is changed from the second type terminal device to the first type Terminal Equipment.

As another optional embodiment, the sending unit 920 is specifically configured to: send the first TA indication information on a D2D broadcast channel.

As another alternative embodiment, the apparatus 900 further includes:

a second receiving unit, configured to receive second indication information that is sent by the network device, where the second indication information is used to indicate the first TA indication information, before the sending unit 920 sends the first TA indication information to the first terminal device At least one of a transmission resource, a transmission power, and a transmission method;

Correspondingly, the sending unit 920 is specifically configured to send the first TA indication information to the first terminal device according to the second indication information received by the second receiving unit.

The communication device 900 according to an embodiment of the present invention may correspond to the second terminal device in the communication method according to the embodiment of the present invention, and the above-described and other operations and/or functions of the respective modules in the communication device 900 are respectively implemented in order to implement FIG. 3 to The corresponding flow of each method in Figure 10, for the sake of brevity, This will not be repeated here.

Therefore, the communication device provided by the embodiment of the present invention obtains the TA value of the self by the network device, and sends the first TA indication information indicating the TA value to the first terminal device, so that the first terminal device can The first TA indicates the information, and determines the TA value of the network, and does not need to directly interact with the network device. Compared with the manner in which each terminal device in the prior art needs to obtain the TA value by interacting with the network device, the network device can be reduced. Burden and signaling overhead, reducing the overall signaling overhead of the system.

FIG. 13 shows another communication device 1100 according to an embodiment of the present invention. The communication device 1100 includes:

a determining unit 1110, configured to determine a transmission resource of the TA indication information, where the TA indication information is sent by the second type of terminal device to the first type of terminal device, and the TA indication information is used to indicate the second type The TA value of the terminal device;

The sending unit 1120 is configured to send second indication information, where the second indication information is used to indicate a transmission resource of the TA indication information.

Specifically, the sending unit 1120 may send the second indication information to one or more terminal devices.

Optionally, the sending unit 1120 is specifically configured to send the second indication information in a broadcast manner.

In another optional embodiment, the second indication information is further used to indicate that the TA indicates the transmit power of the information;

Correspondingly, the determining unit 1110 is further configured to: before the sending unit 1120 sends the second indication information, determine a desired transmission distance of the TA indication information according to the TA adjustment granularity, and determine the TA indication information according to the expected transmission distance. Transmit power.

As another optional embodiment, the determining unit 1110 is further configured to determine that the first terminal device is the first type of terminal device or the second type of terminal device;

Correspondingly, the sending unit 1120 is further configured to send the first indication information to the first terminal device, where the first indication information is used to indicate that the first terminal device determined by the determining unit 1110 is the terminal device of the first type or The second type of terminal device.

At this time, the determining unit 1110 determines that the type of the first terminal device is the first type or the second type, and the sending unit 1120 sends, to the first terminal device, the first terminal device that is used to indicate the determining by the determining unit 1110. The first indication of the type.

As another optional embodiment, the sending unit 1120 is specifically configured to be used in the first terminal device. The first indication information is sent to the first terminal device during the random access process.

As another optional embodiment, the device 1110 further includes: a receiving unit, configured to receive uplink information sent by the second terminal device;

Correspondingly, the determining unit 1110 is further configured to determine, according to the uplink information received by the receiving unit, that the second terminal device is out of synchronization;

The sending unit 1120 is further configured to send the third indication information to the second terminal device, where the third indication information is used to indicate that the second terminal device determined by the determining unit 1110 is out of synchronization.

The communication device 1100 according to an embodiment of the present invention may correspond to a network device in a communication method according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the communication device 1100 are respectively implemented in order to implement FIGS. 3 to 10 The corresponding processes of each method in the following are not repeated here for brevity.

Therefore, the communication apparatus provided by the embodiment of the present invention sends the second indication information indicating the transmission resource of the TA indication information, so that the terminal equipment of the second type sends the TA indication information according to the transmission resource, and the terminal equipment of the first type The TA indication information is monitored according to the transmission resource, and the TA value of the TA is determined according to the detected TA indication information, and the terminal device does not need to directly interact with the network device, and each terminal device in the prior art needs to obtain an interaction with the network device. Compared with the TA value, the burden of the network device and the signaling overhead can be reduced, and the overall signaling overhead of the system can be reduced.

FIG. 14 shows a communication device 1200 according to another embodiment of the present invention. The device 1200 includes:

The determining unit 1210 is configured to determine that the first terminal device is a terminal device of a first type or a terminal device of a second type, where the terminal device of the second type is a terminal device that acquires a TA value from the network device, the first type The terminal device is a terminal device that acquires a TA value from the detected TA indication information sent by the second type of terminal device;

The sending unit 1220 is configured to send the first indication information, where the first indication information is used to indicate that the first terminal device determined by the determining unit 1210 is the terminal device of the first type or the terminal device of the second type.

Specifically, the determining unit 1210 may determine that the type of the first terminal device is the first type or the second type, and the sending unit sends the first indication information to the first terminal device, where the first indication information is used to indicate The determining unit 1210 determines the type of the first terminal device.

Optionally, the sending unit 1220 is specifically configured to send the first indication information in a random access procedure of the first terminal device. For example, the sending unit 1220 sends the piggybacking to the first terminal device. The random access response with the first indication information, but the embodiment of the present invention is not limited thereto.

The communication device 1200 according to an embodiment of the present invention may correspond to a network device in a communication method according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the communication device 1200 are respectively implemented in order to implement FIGS. 3 to 10 The corresponding processes of each method in the following are not repeated here for brevity.

Therefore, the communication device provided by the embodiment of the present invention configures the terminal device as a terminal device of the first type or a terminal device of the second type, wherein the terminal device of the second type acquires its own TA value from the network device, and The terminal device of the first type sends the TA indication information for indicating the value of the TA, so that the terminal device of the first type can determine its own TA value according to the detected TA indication information, without directly interacting with the network device. Compared with the manner in which each terminal device in the prior art needs to obtain the TA value by interacting with the network device, the burden of the network device and the signaling overhead can be reduced, and the overall signaling overhead of the system is reduced.

FIG. 15 shows a communication device 1300 according to an embodiment of the present invention. The device 1300 includes: a processor 1310, configured to:

Detecting the first TA indication information, where the first TA indication information is sent by the second terminal device, and the first TA indication information is used to indicate the TA value of the second terminal device;

And determining, according to the detected first TA indication information, a TA value of the first terminal device.

As an optional embodiment, the first TA indication information is further used to indicate a serving cell of the second terminal device; correspondingly, the processor 1310 is further configured to: if the first terminal device is currently a serving cell and the first The TA indicates that the serving cell indicated by the information is the same, and determines the TA value of the first terminal device according to the detected first TA indication information.

Optionally, the processor 1310 is specifically configured to determine the TA value indicated by the detected first TA indication information as the TA value of the first terminal device.

As an optional embodiment, as shown in FIG. 15, the apparatus 1300 further includes: a receiver 1320, configured to receive first indication information sent by the network device, before the processor 1310 detects the first TA indication information, where the An indication information is used to indicate that the first terminal device is a terminal device of a first type, where the terminal device of the first type is a terminal device that obtains a TA value from the TA indication information sent by the second type of terminal device, where The second type of terminal device is to acquire the TA from the network device Value of the terminal device.

At this time, the processor 1310 is further configured to determine, according to the first indication information received by the receiver 1320, that the first terminal device is the terminal device of the first type.

Optionally, the receiver 1320 is specifically configured to receive the first indication information that is sent by the network device during a random access procedure. At this time, the receiver 1320 can receive the first indication information that is sent by the network device in the process that the first terminal device randomly accesses the network device.

Optionally, in another embodiment, the processor 1310 is further configured to: if the first terminal device is out of synchronization, acquire the TA value of the first terminal device from the network device.

Optionally, the processor 1310 is further configured to continue to detect the first TA indication information after acquiring the TA value of the first terminal device from the network device.

As another alternative embodiment, the processor 1310 is further configured to:

Detecting, when initially accessing the network device or switching from the sleep state to the connected state, the second TA indication information is sent by the third terminal device that has been determined to be the terminal device of the second type, and the The second TA indication information is used to indicate a TA value of the third terminal device;

Optionally, in another embodiment, the processor 1310 is further configured to: if the first terminal device is out of synchronization, acquire the TA value of the first terminal device from the network device. Optionally, the processor 1310 is further configured to: after acquiring the TA value from the network device, determine that the first terminal device is changed from the first type of terminal device to the second type of terminal device.

As another optional embodiment, the processor 1310 is specifically configured to: detect the first TA indication information on a D2D broadcast channel.

As another optional embodiment, the apparatus 1300 further includes: a receiver 1320, configured to receive second indication information sent by the network device, where the second indicator information is used before the processor 1310 detects the first TA indication information, where the second indication information is used And indicating at least one of a transmission resource, a transmission power, and a transmission manner of the first TA indication information;

Correspondingly, the processor 1310 is specifically configured to detect the first TA indication information according to the second indication information received by the receiver 1320.

The communication device 1300 according to an embodiment of the present invention may correspond to the first terminal device in the communication method according to the embodiment of the present invention, and the above and other operations and/or functions of the respective modules in the communication device 1300 are respectively implemented in order to implement FIG. 3 to The corresponding flow of each method in Figure 10, for the sake of brevity, I will not repeat them here.

FIG. 16 shows another communication device 1400 according to an embodiment of the present invention. The device 1400 includes:

The processor 1410 is configured to acquire a TA value of the second terminal device from the network device.

The transmitter 1420 is configured to send the first TA indication information to the first terminal device, where the first TA indication information is used to indicate the TA value acquired by the processor 1410.

As another optional embodiment, the device 1400 further includes: a receiver, configured to receive first indication information sent by the network device, where the processor 1410 acquires a TA value of the second terminal device from the network device, where the first The indication information is used to indicate that the second terminal device is a second type of terminal device, and the second type of terminal device is a terminal device that acquires a TA value from the network device.

At this time, the processor 1410 is further configured to determine, according to the first indication information received by the receiver, that the second terminal device is a second type of terminal device.

As an optional embodiment, the receiver is specifically configured to receive the first indication information that is sent by the network device during a random access procedure. At this time, the receiver is specifically configured to receive the first indication information that is sent by the network device in the process that the second terminal device randomly accesses the network device, for example, the first indication information is carried in a random access response, However, embodiments of the invention are not limited thereto.

As another alternative embodiment, the processor 1410 is further configured to:

Detecting, when initially accessing the network device, or switching from the sleep state to the connected state, the second TA indication information is sent by the third terminal device that is determined to be the terminal device of the second type, And the second TA indication information is used to indicate a TA value of the third terminal device;

Determining the second terminal device if the second TA indication information is not detected within the preset time period It is a second type of terminal device.

As another optional embodiment, the transmitter 1420 is specifically configured to send the first TA indication information on a D2D broadcast channel.

As another alternative embodiment, the apparatus 1400 further includes:

a receiver, configured to receive second indication information that is sent by the network device, where the second indication information is used to indicate a transmission resource of the first TA indication information, before the sending, by the transmitter, the first TA indication information At least one of transmission power and transmission mode;

Correspondingly, the transmitter 1420 is specifically configured to send the first TA indication information to the first terminal device according to the second indication information received by the receiver.

The communication device 1400 according to an embodiment of the present invention may correspond to a second terminal device in a communication method according to an embodiment of the present invention, and the above-described and other operations and/or functions of respective modules in the communication device 1400 are respectively implemented in order to implement FIG. The corresponding processes of the respective methods in FIG. 10 are not described herein for the sake of brevity.

FIG. 17 shows another communication device 1500 according to an embodiment of the present invention. The communication device 1500 includes:

The processor 1510 is configured to determine a transmission resource of the TA indication information, where the TA indication information is sent by the second type of terminal device to the first type of terminal device, and the TA indication information is used to indicate the second type. The TA value of the terminal device;

The transmitter 1520 is configured to send second indication information, where the second indication information is used to indicate a transmission resource of the TA indication information.

Specifically, the transmitter 1520 can send the second indication information to one or more terminal devices.

Optionally, the transmitter 1520 is specifically configured to send the second indication information in a broadcast manner.

Correspondingly, the processor 1510 is further configured to: before the transmitter 1520 sends the second indication information, determine a desired transmission distance of the TA indication information according to the TA adjustment granularity, and determine the TA indication information according to the expected transmission distance. Transmit power.

As another optional embodiment, the processor 1510 is further configured to determine that the first terminal device is the first type of terminal device or the second type of terminal device;

Correspondingly, the transmitter 1520 is further configured to send the first indication information to the first terminal device, where the first indication information is used to indicate that the first terminal device determined by the processor 1510 is the first type of terminal device or The second type of terminal device.

At this time, the processor 1510 determines that the type of the first terminal device is the first type or the second type, and the transmitter 1520 sends the first indication information to the first terminal device, where the first indication information is used to indicate the The type of the first terminal device determined by the processor 1510.

As another optional embodiment, the transmitter 1520 is specifically configured to send the first indication information to the first terminal device in a random access procedure of the first terminal device.

As another optional embodiment, the device 1110 further includes: a receiver, configured to receive uplink information sent by the second terminal device;

Correspondingly, the processor 1510 is further configured to determine, according to the uplink information received by the receiver, that the second terminal device is out of synchronization;

The transmitter 1520 is further configured to send the third indication information to the second terminal device, where the third indication information is used to indicate that the second terminal device determined by the processor 1510 is out of synchronization.

The communication device 1500 according to an embodiment of the present invention may correspond to a network device in a communication method according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the communication device 1500 are respectively implemented in order to implement FIGS. 3 to 10 The corresponding processes of each method in the following are not repeated here for brevity.

FIG. 18 shows a communication device 1600 according to another embodiment of the present invention. The device 1600 includes:

The processor 1610 is configured to determine that the first terminal device is a first type of terminal device or a second type of terminal device, where the second type of terminal device is a terminal device that acquires a TA value from the network device, the first type The terminal device is a terminal device that acquires a TA value from the detected TA indication information sent by the second type of terminal device;

The transmitter 1620 is configured to send the first indication information, where the first indication information is used to indicate that the first terminal device determined by the processor 1610 is the terminal device of the first type or the terminal device of the second type.

Specifically, the processor 1610 may determine that the type of the first terminal device is the first type or the second type, and the transmitter 1620 sends the first indication information to the first terminal device, where the first indication information is used for The type of the first terminal device determined by the processor 1610 is indicated.

Optionally, the transmitter 1620 is specifically configured to send the first indication information in a random access procedure of the first terminal device. For example, the transmitter 1620 sends a random access response carrying the first indication information to the first terminal device, but the embodiment of the present invention is not limited thereto.

The communication device 1600 according to an embodiment of the present invention may correspond to a network device in a communication method according to an embodiment of the present invention, and the above and other operations and/or functions of respective modules in the communication device 1600 are respectively implemented in order to implement FIGS. 3 to 10 The corresponding processes of each method in the following are not repeated here for brevity.

It should be understood that, in the embodiment of the present invention, the processor in the foregoing apparatus may be a central processing unit (CPU), and the processor 610 may also be other general-purpose processors, digital signal processors (DSPs), and dedicated Integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

Optionally, the above apparatus may further include a memory, which may include a read only memory and a random access memory, and provides instructions and data to the processor. A portion of the memory can also include Non-volatile random access memory. For example, the memory can also store information of the device type.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the instructions in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

It should also be understood that the description herein of the various embodiments above focuses on the differences of the various embodiments, while the remaining portions may be referenced to each other. The technical features and descriptions of the above embodiments are applicable to other embodiments. For example, the technical features of the method embodiments may be applied to the device embodiments or other method embodiments, and will not be further described in other embodiments.

It should also be understood that the sending unit or the transmitter in the above embodiment may refer to transmitting on the air interface, may not be sent on the air interface, but may be sent to other devices to facilitate other devices to send on the air interface. The receiving unit or the receiver in the above embodiment may refer to receiving on the air interface, and may not receive on the air interface, but receive from other devices received on the air interface.

It should be understood that in the embodiments of the present invention, the term and/or merely an association relationship describing the associated object indicates that there may be three relationships. For example, A and/or B may indicate that A exists separately, and A and B exist simultaneously, and B cases exist alone. In addition, the character / in this paper generally indicates that the contextual object is an OR relationship.

Those skilled in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the steps and composition of the various embodiments have been generally described in terms of function in the foregoing description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. Different methods may be used to implement the described functionality for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and The method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The technical features and descriptions in the above embodiments are applicable to other embodiments in order to make the application documents clear and clear. For example, the technical features of the method embodiments may be applied to device embodiments or other method embodiments, in other embodiments. I will not repeat them one by one.

The sending module or the sending unit or the transmitter in the above embodiment may refer to sending on the air interface, but may not be sent on the air interface, but sent to other devices to facilitate other devices to send on the air interface. The receiving module or the receiving unit or the receiver in the above embodiment may refer to receiving on the air interface, and may not receive on the air interface, but receive from other devices received on the air interface.

The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited. In this regard, any equivalent modifications or alterations are obvious to those skilled in the art within the scope of the present invention, and such modifications and alterations are intended to be included within the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A communication method, comprising:

The first terminal device detects the first time advance TA indication information, where the first TA indication information is sent by the second terminal device, and the first TA indication information is used to indicate the TA of the second terminal device value;

The first terminal device determines a TA value of the first terminal device according to the detected first TA indication information.
The method according to claim 1, wherein the first TA indication information is further used to indicate a serving cell of the second terminal device;

Determining, according to the detected first TA indication information, the TA value of the first terminal device, including:

And determining, according to the detected first TA indication information, a TA value of the first terminal device, if the current serving cell of the first terminal device is the same as the serving cell indicated by the first TA indication information.
The method according to claim 1 or 2, wherein the determining the TA value of the first terminal device according to the detected first TA indication information comprises:

Determining, by the detected first TA indication information, a TA value as a TA value of the first terminal device.
The method according to any one of claims 1 to 3, wherein before the detecting the first TA indication information, the method further comprises:

And receiving, by the network device, first indication information, where the first indication information is used to indicate that the first terminal device is a terminal device of a first type, where the terminal device of the first type is a terminal device of a second type The terminal device that obtains the TA value in the TA indication information sent by the device, and the terminal device in the second type is the terminal device that acquires the TA value from the network device.
The method according to claim 4, wherein the receiving the first indication information sent by the network device comprises:

Receiving the first indication information that is sent by the network device in a random access procedure.
The method according to claim 4 or 5, wherein the method further comprises:

If the first terminal device is out of synchronization, obtain the TA value of the first terminal device from the network device;

The first TA indication information is continuously detected.
The method according to any one of claims 1 to 3, wherein before the detecting the first TA indication information, the method further comprises:

The first terminal device detects the second TA indication information when initially accessing the network device or switching from the sleep state to the connection state, where the second TA indication information is the third device that has been determined to be the second type of terminal device. Transmitted by the terminal device, and the second TA indication information is used to indicate a TA value of the third terminal device;

And if the second TA indication information is detected within a preset time period, determining that the first terminal device is a first type of terminal device.
The method of claim 7, wherein the method further comprises:

If the first terminal device is out of synchronization, the TA value of the first terminal device is obtained from the network device.
The method according to any one of claims 1 to 8, wherein the detecting the first TA indication information comprises:

The first TA indication information is detected on a device-to-device D2D broadcast channel.
The method according to any one of claims 1 to 9, wherein before the detecting the first TA indication information, the method further comprises:

Receiving, by the network device, the second indication information, where the second indication information is used to indicate at least one of a transmission resource, a transmission power, and a transmission manner of the first TA indication information;

The detecting the first TA indication information includes:

And detecting, according to the second indication information, the first TA indication information.
A communication method, comprising:

Obtaining, by the second terminal device, a time advance TA value of the second terminal device from the network device;

The second terminal device sends the first TA indication information to the first terminal device, where the first TA indication information is used to indicate the TA value of the second terminal device.
The method according to claim 11, wherein the first TA indication information is further used to indicate a serving cell of the second terminal device.
The method according to claim 11 or 12, wherein before the obtaining, by the network device, the TA value of the second terminal device, the method further comprises:

Receiving, by the network device, first indication information, where the first indication information is used to indicate that the second terminal device is a second type of terminal device, and the second type of terminal device is configured to acquire a TA value from the network device Terminal equipment.
The method according to claim 13, wherein the receiving the first indication information sent by the network device comprises:

Receiving the first indication information that is sent by the network device in a random access procedure.
The method according to claim 11 or 12, wherein before the obtaining, by the network device, the TA value of the second terminal device, the method further comprises:

Detecting second TA indication information when initially accessing the network device or switching from a sleep state to a connection state, the second TA indication information being sent by a third terminal device that has been determined to be the second type of terminal device And the second TA indication information is used to indicate a TA value of the third terminal device;

If the second TA indication information is not detected within the preset time period, determining that the second terminal device is the second type of terminal device.
The method according to any one of claims 11 to 15, wherein the sending the first TA indication information to the first terminal device comprises:

The first TA indication information is sent on a device-to-device D2D broadcast channel.
The method according to any one of claims 11 to 16, wherein before the sending the first TA indication information to the first terminal device, the method further includes:

Receiving, by the network device, the second indication information, where the second indication information is used to indicate at least one of a transmission resource, a transmission power, and a transmission manner of the first TA indication information;

The sending the first TA indication information to the first terminal device includes:

And transmitting first TA indication information to the first terminal device according to the second indication information.
A communication method, comprising:

Determining a transmission resource of the time advance TA indication information, wherein the TA indication information is sent by the second type of terminal device to the first type of terminal device, and the TA indication information sent by the second type of terminal device is used by Instructing the TA value of the second type of terminal device;

Sending the second indication information, where the second indication information is used to indicate the transmission resource of the TA indication information.
The method according to claim 18, wherein the sending the second indication information comprises: transmitting the second indication information in a broadcast form.
The method according to claim 18 or 19, wherein the second indication information is further used to indicate a transmit power of the TA indication information;

Before the sending the second indication information, the method further includes:

Determining a desired transmission distance of the TA indication information according to the TA adjustment granularity;

And determining, according to the expected transmission distance, a transmit power of the TA indication information.
The method according to any one of claims 18 to 20, wherein the method further comprises:

Determining that the first terminal device is the first type of terminal device or the second type of terminal device;

Sending the first indication information to the first terminal device, where the first indication information is used to indicate that the first terminal device is the first type terminal device or the second type terminal device.
The method according to claim 21, wherein the sending the first indication information to the first terminal device comprises:

Transmitting the first indication information to the first terminal device in a random access process of the first terminal device.
The method according to any one of claims 18 to 22, wherein the method further comprises:

Receiving uplink information sent by the second terminal device;

Determining, by the received uplink information, that the second terminal device is out of synchronization;

The third indication information is sent to the second terminal device, where the third indication information is used to indicate that the second terminal device is out of synchronization.
A communication method, comprising:

Determining that the first terminal device is a terminal device of a first type or a terminal device of a second type, wherein the terminal device of the second type is a terminal device that acquires a time advance TA value from the network device, where the terminal device of the first type The device is a terminal device that acquires a TA value from the TA indication information sent by the detected second type terminal device;

Sending the first indication information, where the first indication information is used to indicate that the first terminal device is the first type of terminal device or the second type of terminal device.
The method according to claim 24, wherein the sending the first indication information comprises:

Transmitting the first indication information in a random access procedure of the first terminal device.
A communication device, comprising:

a detecting unit, configured to detect a first time advance TA indication information, where the first TA indication information is sent by a second terminal device, and the first TA indication information is used to indicate Describe the TA value of the second terminal device;

And a determining unit, configured to determine a TA value of the first terminal device according to the first TA indication information detected by the detecting unit.
The apparatus according to claim 26, wherein the first TA indication information is further used to indicate a serving cell of the second terminal device;

The determining unit is specifically configured to: if the current serving cell of the first terminal device is the same as the serving cell indicated by the first TA indication information, determine the first TA indication information that is detected by the detecting unit, The TA value of the first terminal device.
The device according to claim 26 or 27, wherein the determining unit is specifically configured to determine a TA value indicated by the first TA indication information detected by the detecting unit as a TA of the first terminal device value.
The device according to any one of claims 26 to 28, wherein the device further comprises:

a first receiving unit, configured to receive first indication information that is sent by the network device, where the first indication information is used to indicate that the first terminal device is the first type, before the detecting unit detects the first TA indication information a terminal device, wherein the terminal device of the first type is a terminal device that acquires a TA value from TA indication information sent from a second type of terminal device, and the second type of terminal device acquires a TA from the network device Value of the terminal device.
The apparatus according to claim 29, wherein the first receiving unit is specifically configured to receive the first indication information that is sent by the network device in a random access procedure.
The device according to claim 29 or 30, wherein the device further comprises:

a first acquiring unit, configured to acquire, when the first terminal device is out of synchronization, the TA value of the first terminal device from the network device;

The detecting unit is further configured to continue to detect the first TA indication information after the first acquiring unit acquires the TA value of the first terminal device from the network device.
The device according to any one of claims 26 to 28, wherein the detecting unit is further configured to detect the second TA indication information when initially accessing the network device or switching from the sleep state to the connected state, The second TA indication information is sent by the third terminal device that has been determined to be the second type of terminal device, and the second TA indication information is used to indicate the TA value of the third terminal device;

The determining unit is further configured to: if the detecting unit detects the second time in a preset time period The TA indicates information that the first terminal device is determined to be the first type of terminal device.
The device of claim 32, wherein the device further comprises:

And a second acquiring unit, configured to acquire a TA value of the first terminal device from the network device, if the first terminal device is out of synchronization.
The device according to any one of claims 26 to 33, wherein the detecting unit is specifically configured to:

The first TA indication information is detected on a device-to-device D2D broadcast channel.
The device according to any one of claims 26 to 34, wherein the device further comprises:

a second receiving unit, configured to receive second indication information that is sent by the network device, where the second indication information is used to indicate a transmission resource of the first TA indication information, before the detecting unit detects the first TA indication information, At least one of transmit power and transmission mode;

The detecting unit is specifically configured to detect the first TA indication information according to the second indication information received by the second receiving unit.
The device according to any one of claims 26 to 35, wherein the device is the first terminal device.
A communication device, comprising:

An acquiring unit, configured to acquire a time advance TA value of the second terminal device from the network device;

And a sending unit, configured to send the first TA indication information to the first terminal device, where the first TA indication information is used to indicate a TA value acquired by the acquiring unit.
The apparatus according to claim 37, wherein the first TA indication information is further used to indicate a serving cell of the second terminal device.
The device according to claim 37 or 38, wherein the device further comprises:

a first receiving unit, configured to receive first indication information sent by the network device, where the first indication information is used to indicate the second, before the acquiring unit acquires a TA value of the second terminal device from the network device The terminal device is a second type of terminal device, and the second type of terminal device is a terminal device that acquires a TA value from the network device.
The device according to claim 39, wherein the first receiving unit is specifically configured to receive the first indication information that is sent by the network device in a random access procedure.
The device according to claim 37 or 38, wherein the device further comprises:

a detecting unit, configured to initially access the network device or switch from a sleep state to a connected state And detecting, by the second TA indication information, the third TA indication information is sent by a third terminal device that is determined to be the second type of terminal device, and the second TA indication information is used to indicate the The TA value of the third terminal device;

And a determining unit, configured to determine that the second terminal device is a second type of terminal device if the detecting unit does not detect the second TA indication information within a preset time period.
The apparatus according to any one of claims 37 to 41, wherein the transmitting unit is specifically configured to send the first TA indication information on a device-to-device D2D broadcast channel.
The device according to any one of claims 37 to 42, wherein the device further comprises:

a second receiving unit, configured to receive second indication information that is sent by the network device, where the second indication information is used to indicate the first information, before the transmitting unit sends the first TA indication information to the first terminal device The TA indicates at least one of a transmission resource, a transmission power, and a transmission mode of the information;

The sending unit is configured to send the first TA indication information to the first terminal device according to the second indication information that is received by the second receiving unit.
The device according to any one of claims 37 to 43, wherein the device is the second terminal device.
A communication device, comprising:

a determining unit, configured to determine a transmission resource of the time advance TA indication information, where the TA indication information is sent by the second type of terminal device to the first type of terminal device, and the TA indication information is used to indicate Describe the TA value of the second type of terminal device;

And a sending unit, configured to send the second indication information, where the second indication information is used to indicate a transmission resource of the TA indication information.
The apparatus according to claim 45, wherein the sending unit is specifically configured to send the second indication information in a broadcast form.
The apparatus according to claim 45 or 46, wherein the second indication information is further used to indicate a transmit power of the TA indication information;

The determining unit is further configured to: before the sending unit sends the second indication information, determine a desired transmission distance of the TA indication information according to the TA adjustment granularity, and determine the TA indication information according to the expected transmission distance. Transmit power.
The device according to any one of claims 45 to 47, wherein the determining unit is further configured to determine that the first terminal device is the first type of terminal device or the second type Type terminal equipment;

The sending unit is further configured to send the first indication information to the first terminal device, where the first indication information is used to indicate that the first terminal device determined by the determining unit is the terminal device of the first type Or the second type of terminal device.
The apparatus according to claim 48, wherein the sending unit is specifically configured to send the first indication information to the first terminal device in a random access procedure of the first terminal device.
The device according to any one of claims 45 to 49, wherein the device further comprises:

a receiving unit, configured to receive uplink information sent by the second terminal device;

The determining unit is further configured to determine, according to the uplink information received by the receiving unit, that the second terminal device is out of synchronization;

The sending unit is further configured to send the third indication information to the second terminal device, where the third indication information is used to indicate that the second terminal device determined by the determining unit is out of synchronization.
Apparatus according to any one of claims 45 to 50, wherein said apparatus is said network device.
A communication device, comprising:

a determining unit, configured to determine that the first terminal device is a first type of terminal device or a second type of terminal device, where the second type of terminal device is a terminal device that acquires a time advance TA value from the network device, The terminal device of the first type is a terminal device that acquires a TA value from the TA indication information sent by the detected terminal device of the second type;

a sending unit, configured to send the first indication information, where the first indication information is used to indicate that the first terminal device determined by the determining unit is the terminal device of the first type or the terminal device of the second type .
The apparatus according to claim 52, wherein the sending unit is specifically configured to send the first indication information in a random access procedure of the first terminal device.
The device according to claim 52 or 53, wherein said device is said network device.