CN104936166A

CN104936166A - Signal sending and receiving method and device

Info

Publication number: CN104936166A
Application number: CN201410105778.9A
Authority: CN
Inventors: 陈文洪; 高秋彬; 赵锐; 彭莹
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2014-03-20
Filing date: 2014-03-20
Publication date: 2015-09-23
Anticipated expiration: 2034-03-20
Also published as: WO2015139555A1; CN104936166B

Abstract

The invention discloses a signal sending and receiving method and device, and is used for enabling receiving end UE to be informed of the signal format configuration of a signal sent by sending end UE, thus when in signal detection, different signal format configurations do not need to be traversed to detect signals respectively, and detection complexity of a received signal is effectively reduced. The signal sending method provided by the invention includes: first US determines the signal format configuration of a signal that needs to be sent to second UE; the first UE determines signal format indication information that needs to be carried in a synchronization channel according to the signal format configuration; the first UE sends the signal format indication information to the second UE through the synchronization channel when determining that the signal format indication information needs to be carried in the synchronization channel; and the first UE generates the signal that needs to be sent to the second UE according to the signal format configuration and sends the signal to the second UE.

Description

Signal sending and receiving method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a signal transmitting method and a signal receiving method and apparatus.

Background

A Device-to-Device (D2D) communication technology, i.e., a terminal-through technology, refers to a way in which a neighboring terminal can perform data transmission through a direct link within a short distance without forwarding through a central node (i.e., a base station), as shown in fig. 1. The short-range communication characteristic and the direct communication mode of the D2D technology have the following advantages:

the terminal short-distance direct communication mode can realize higher data rate, lower delay and lower power consumption;

the effective utilization of frequency spectrum resources can be realized by utilizing the characteristics of widely distributed user terminals in the network and the short distance of the D2D communication link;

the direct communication mode of the D2D can adapt to the local data sharing requirement of the service such as wireless point-to-point (P2P) and the like, and provides data service with flexible adaptability;

D2D direct communication enables the use of a large number and wide distribution of communication terminals in a network to extend the coverage of the network.

The Long Term Evolution (LTE) D2D technology refers to a discovery and communication process of a LTE network-controlled D2D operating in an LTE licensed frequency band. On one hand, the advantages of the D2D technology can be fully utilized, and meanwhile, the control of the LTE network can also overcome some problems of the conventional D2D technology, such as uncontrollable interference and the like. The introduction of the LTE D2D feature will move the LTE Technology from pure wireless mobile cellular communication Technology towards "Universal Connectivity Technology".

A User Equipment (UE) first needs to synchronize before performing D2D transmission. The UE obtains a Synchronization reference for transmitting a D2D Signal from a Synchronization Signal (D2 DSS) transmitted by a reference Synchronization source. Before the UE transmits the D2D signal, a synchronization signal (Physical Device to Device synchronization channel, PD2 DSCH) may be transmitted, where the synchronization signal may provide a synchronization reference for other UEs, and the synchronization channel may carry some resource configuration information or synchronization source information. The resource configuration information is generally resource pool information used by the UE to transmit the D2D signal, and the synchronization source information generally includes information such as a type of a reference synchronization source of the UE, a current forwarding number, and the like.

The general procedure for the UE to detect and transmit D2D signals includes:

the UE detects a synchronous signal and a synchronous channel;

after detecting the synchronous signal and the synchronous channel, determining a received synchronous reference according to the synchronous signal, and acquiring resource configuration information or synchronous source information from the synchronous channel;

the UE obtains a resource pool used for signal detection through other signaling indications or resource configuration information in the synchronization channel, and detects the synchronization signal and the D2D signal corresponding to the synchronization channel according to the resource pool and the synchronization reference.

When the UE needs to transmit the D2D signal, the D2D signal is transmitted according to the synchronization reference obtained by referring to the synchronization signal of the synchronization source and the resource pool for signal transmission obtained by other signaling indication or resource configuration information in the synchronization channel.

Referring to fig. 2, fig. 2 contains several typical D2D transmission scenarios: intra-cell, inter-cell, partial network coverage, and no network coverage D2D transmissions. For D2D transmission in or between cells, since the UE is in the network coverage, the length of a Cyclic Prefix (CP) used by the UE to send D2D signals can be determined by an evolved NodeB (eNB), and the UE knows the CP type of the current cell by detecting a Packet Switching System (PSS). The size of the guard interval (GP) included in the D2D signal may also be configured by the eNB or adopt a pre-agreed fixed size. Here, GP refers to a guard interval introduced in the D2D signal, and the UE does not transmit the D2D signal within GP. In order to prevent interference to cellular signals, the D2D signals transmitted by UEs within network coverage generally contain GPs. The two CP types used in LTE are normal CP and extended CP, respectively. Also, different D2D discovery types may employ different CP types for UEs within network coverage.

For the UE outside the network coverage, since there is no node for configuration, the CP type or GP size adopted by the UE generally adopts a pre-configured method, or is obtained through eNB configuration information forwarded by the UE inside the network coverage. A UE out of network coverage may transmit a D2D signal without a GP if it does not interfere with the cellular signal.

In summary, one D2D UE may want to detect different types of D2D signals transmitted by UEs from different coverage situations or different cells, and the CP types or GP sizes used by these D2D signals may be different. For example, as shown in fig. 3, the CP types and GP sizes used by the in-coverage UE1 and the out-of-coverage UE2 may not be the same. For the receiving UEs 3 and 4, since the CP type or GP size of the currently detected D2D signal cannot be known, the signal detection cannot be accurately performed. The complexity of detection is greatly increased if each detection is based on the possible CP type or GP size separately.

Additional interference may also be introduced if different CP types or GP sizes are used with surrounding D2D UEs or cellular UEs when the UEs transmit D2D signals. For example, UE1 and UE2 use subframes in the same resource pool to transmit D2D signals, but their CP types are different, and signals between them are not Orthogonal to Orthogonal Frequency Division Multiplexing (OFDM), and there is serious interference. Meanwhile, if the last symbol of the D2D signal transmitted by the UE2 is GP-free and the UE1 transmits the cellular signal on the cell subframe adjacent to the D2D subframe, since the timing of the D2D signal is transmitted according to the downlink timing and the timing of the cellular signal is advanced, their signals have overlapping portions, thereby generating mutual interference.

Since different types of discovery signals, or different types of D2D signals, i.e., discovery signals or communication signals, may use different CP types, and the CP type of the synchronization signal may also be different from that of the D2D, the UE cannot reuse the existing mechanism to know the CP type of other D2D signals (discovery signals or communication signals) by blindly detecting the CP type of the D2D synchronization signal.

Disclosure of Invention

The embodiment of the invention provides a signal sending and receiving method and a device, which are used for enabling receiving end UE to acquire the signal format configuration of a signal sent by sending end UE, so that different signal format configurations do not need to be traversed and detected respectively during signal detection, and the detection complexity of the received signal can be effectively reduced.

The signal sending method provided by the embodiment of the invention comprises the following steps:

the method comprises the steps that a first UE determines the signal format configuration of a signal needing to be sent to a second UE;

the first UE determines signal format indication information which needs to be carried in a synchronous channel according to the signal format configuration;

when determining that the signal format indication information needs to be carried in a synchronization channel, the first UE sends the signal format indication information to the second UE through the synchronization channel;

and the first UE generates the signal which needs to be sent to the second UE according to the signal format configuration and sends the signal to the second UE.

By the method, the receiving end UE can acquire the signal format configuration of the signal sent by the sending end UE, so that the receiving end UE does not need to traverse different signal format configurations and respectively detect when detecting the signal, and the detection complexity of the received signal can be effectively reduced.

Preferably, the determining, by the first UE, the signal format configuration of the signal to be sent to the second UE includes:

the first method is as follows: the first UE determines the signal format configuration of the signal to be sent to the second UE according to the indicated signal format configuration information of the network side; or,

the second method comprises the following steps: the first UE determines the signal format configuration of a signal to be sent to the second UE according to the signal format configuration information forwarded by the other UE; or,

the third method comprises the following steps: the first UE adopts the pre-configured signal format configuration as the signal format configuration of the signal which needs to be sent to the second UE.

Preferably, the signal format is configured as a cyclic prefix CP type configuration or a signal guard interval GP configuration.

Preferably, the cyclic prefix is configured as a normal CP or an extended CP, and the signal guard interval GP configuration includes whether to adopt a GP and/or a length configuration of the GP.

Preferably, when the signal format configuration is a cyclic prefix CP type configuration, the determining, by the first UE, signal format indication information that needs to be carried in a synchronization channel according to the signal format configuration includes:

when the first UE determines the CP type configuration of the signal which needs to be sent to the second UE through the first mode or the second mode, the first UE determines that 1-bit CP type indication information needs to be adopted in a synchronous channel and indicates the CP type of the signal which is carried in the synchronous channel and sent to the second UE by the first UE; or,

the first UE adopts one or more bits of CP type indication information in a synchronization channel to indicate the CP type of a signal sent to the second UE by the first UE carried in the synchronization channel.

Preferably, when the signal format configuration is a signal guard interval GP configuration, the determining, by the first UE, signal format indication information that needs to be carried in a synchronization channel according to the signal format configuration includes:

the first UE indicates GP configuration through synchronization information and/or resource configuration information carried in a synchronization channel; or,

the first UE adopts GP configuration indication information of one or more bits in a synchronous channel to indicate GP configuration of a signal sent by the first UE to the second UE.

Preferably, the sending, by the first UE, the length indication information to the second UE through a synchronization channel includes: and the first UE sends the length indication information to the second UE through a synchronous channel by adopting preset signal format configuration.

Preferably, the signal that the first UE needs to send to the second UE has at least one of the following associations with the synchronization channel:

a channel for transmitting a signal that the first UE needs to send to the second UE is synchronized with the timing and frequency of the synchronization channel, or has a preset offset;

the physical resource used by the channel for transmitting the signal which needs to be sent to the second UE by the first UE and the physical resource of the synchronous channel have a preset mapping relation;

the physical resource used by the channel for transmitting the signal which needs to be sent to the second UE by the first UE is indicated by the information in the synchronous channel;

the scrambling scheme or the demodulation reference signal configuration of the channel used for transmitting the signal that the first UE needs to send to the second UE is indicated by information in the synchronization channel.

The signal receiving method provided by the embodiment of the invention comprises the following steps:

the second UE detects the signal in the synchronous channel and acquires the information carried in the synchronous channel;

the second UE determines the signal format configuration adopted by the signal sent to the second UE by the first UE corresponding to the synchronous channel according to the information carried in the synchronous channel;

and the second UE detects the signal sent by the first UE to the second UE corresponding to the synchronous channel according to the signal format configuration.

By the method, the receiving end UE acquires the signal format configuration of the signal sent by the sending end UE, so that different signal format configurations do not need to be traversed and detected respectively during signal detection, and the detection complexity of the received signal can be effectively reduced.

Preferably, the second UE detects the signal in the synchronization channel, including:

and the second UE detects the signal in the synchronous channel based on the preset signal format configuration.

Preferably, the signal in the synchronization channel includes one or a combination of the following information:

synchronization source information of a first UE;

resource configuration information of a first UE;

and the first UE sends the signal format indication information of the signal to the second UE.

Preferably, the signal sent by the first UE to the second UE has at least one of the following association relations with the synchronization channel:

the scrambling mode or DMRS configuration of a channel used for transmitting a signal that the first UE needs to transmit to the second UE is indicated by information in a synchronization channel.

Preferably, the signal format is configured as a cyclic prefix CP configuration or a signal guard interval GP configuration.

Preferably, when the signal format configuration is a cyclic prefix CP type configuration, the determining, by the second UE, a CP type configuration adopted by a signal sent to the second UE by the first UE corresponding to the synchronization channel according to the information carried in the synchronization channel includes:

if the synchronous channel does not contain CP type indication information, adopting a preset CP type as CP type configuration adopted by a signal sent to second UE by first UE corresponding to the synchronous channel; if the synchronous channel contains CP type indication information, determining the CP type configuration adopted by a signal sent to a second UE by a first UE corresponding to the synchronous channel according to the CP type indication information;

or, directly according to the CP type indication information in the synchronization channel, determining the CP type configuration adopted by the signal sent by the first UE to the second UE, which corresponds to the synchronization channel.

Preferably, when the signal format configuration is a signal guard interval GP configuration, the determining, by the second UE, a signal format configuration adopted by a signal sent by the first UE to the second UE and corresponding to the synchronization channel according to the information carried in the synchronization channel includes:

the second UE judges whether a signal sent to the second UE by the first UE corresponding to the synchronous channel has GP or not according to GP configuration indication information or other information in the synchronous channel, and if the GP exists, preset GP configuration is adopted; or,

and the second UE determines the GP configuration adopted by a signal sent to the second UE by the first UE corresponding to the synchronous channel according to the GP configuration indication information in the synchronous channel.

Preferably, the determining, by the second UE, whether a signal sent to the second UE by the first UE corresponding to the synchronization channel has a GP according to the GP configuration indication information or other information in the synchronization channel includes:

if the synchronization source type indicated in the synchronization channel is network side equipment, the second UE determines that GP exists; otherwise, determining that no GP exists; or,

if the synchronous channel contains the resource configuration information of the signal sent by the first UE to the second UE, the second UE determines that GP exists; otherwise, determining that no GP exists; or,

if the synchronization source type indicated in the synchronization signal is network side equipment and the synchronization channel contains resource configuration information, the second UE determines that GP exists; otherwise, determining that no GP exists; or,

and the second UE directly judges whether GP exists according to the GP indication information in the synchronous channel.

Preferably, the method further comprises:

and the second UE determines the signal format configuration of the signal sent to the first UE by the second UE according to the determined signal format configuration.

The signal sending device provided by the embodiment of the invention comprises:

a first signal format configuration determining unit, configured to determine a signal format configuration of a signal that needs to be sent by a first UE to a second UE;

a signal format indication information determining unit, configured to determine, according to the signal format configuration, signal format indication information that needs to be carried in a synchronization channel;

a signal format indication information sending unit, configured to send the signal format indication information to a second UE through a synchronization channel when it is determined that the synchronization channel needs to carry the signal format indication information;

and the signal sending unit is used for generating the signal which needs to be sent to the second UE according to the signal format configuration and sending the signal to the second UE.

By the device, the receiving end UE can know the signal format configuration of the signal sent by the sending end UE, so that different signal format configurations do not need to be traversed and detected respectively during signal detection, and the detection complexity of the received signal can be effectively reduced.

Preferably, the first signal format configuration determining unit determines the signal format configuration of the signal that the first UE needs to send to the second UE specifically by one of the following manners:

the first method is as follows: determining the signal format configuration of a signal which needs to be sent to a second UE by a first UE according to the indicated signal format configuration information of the network side; or,

the second method comprises the following steps: determining the signal format configuration of a signal which needs to be sent to a second UE by a first UE according to the signal format configuration information forwarded by another UE; or,

the third method comprises the following steps: and adopting the pre-configured signal format configuration as the signal format configuration of the signal which needs to be sent to the second UE by the first UE.

Preferably, when the signal format configuration is a cyclic prefix CP type configuration, the signal format indication information determining unit is specifically configured to:

when the signal format configuration determining unit determines the CP type configuration of the signal to be sent to the second UE through the first or second mode, it determines that 1-bit CP type indication information needs to be adopted in the synchronization channel to indicate the CP type of the signal sent to the second UE by the first UE carried in the synchronization channel; or,

one or more bits of CP type indication information are adopted in the synchronization channel to indicate the CP type of a signal sent by the first UE to the second UE, wherein the CP type indication information is carried in the synchronization channel.

Preferably, when the signal format configuration is the signal guard interval GP configuration, the signal format indication information determining unit is specifically configured to:

indicating GP configuration through information carried in a synchronous channel; or,

and adopting one or more bits of GP configuration indication information in the synchronous channel to indicate GP configuration of a signal sent to a second UE by a first UE carried in the synchronous channel.

Preferably, the signal format indicator sending unit, when sending the length indicator to the second UE through a synchronization channel, is specifically configured to: and sending the length indication information to the second UE through a synchronous channel by adopting preset signal format configuration.

The embodiment of the invention provides a signal receiving device, which comprises:

a synchronous channel detection unit, configured to detect a signal in a synchronous channel and obtain information carried in the synchronous channel;

a second signal format configuration determining unit, configured to determine, according to the information carried in the synchronization channel, a signal format configuration adopted by a signal sent by the first UE to the second UE, where the signal format configuration is corresponding to the synchronization channel;

and the signal detection unit is used for detecting the signal which is sent to the second UE by the first UE and corresponds to the synchronous channel according to the signal format configuration.

Preferably, when the synchronization channel detection unit detects a signal in a synchronization channel, the synchronization channel detection unit is specifically configured to: and detecting the signal in the synchronous channel based on the preset signal format configuration.

synchronization source information of a synchronization channel;

resource configuration information of a signal sent by a first UE to a second UE;

Preferably, when the signal format configuration is a cyclic prefix CP type configuration, the second signal format configuration determining unit is specifically configured to:

Preferably, when the signal format configuration is a signal guard interval GP configuration, the second signal format configuration determining unit is specifically configured to:

judging whether a signal sent by first UE to second UE corresponding to a synchronous channel has GP or not according to GP configuration indication information or other information in the synchronous channel, and adopting preset GP configuration when the GP exists; or,

and determining GP configuration adopted by a signal sent to a second UE by a first UE corresponding to the synchronous channel according to GP configuration indication information in the synchronous channel.

Preferably, when the second signal format configuration determining unit determines whether a signal sent by the first UE to the second UE and corresponding to the synchronization channel has a GP according to the GP configuration indication information or other information in the synchronization channel, the second signal format configuration determining unit is specifically configured to:

if the synchronization source type indicated in the synchronization channel is the network side equipment, determining that GP exists; otherwise, determining that no GP exists; or,

if the synchronous channel contains the resource configuration information of the signal sent by the first UE to the second UE, determining that GP exists; otherwise, determining that no GP exists; or,

if the synchronization source type indicated in the synchronization signal is network side equipment and the synchronization channel contains resource configuration information, determining that GP exists; otherwise, determining that no GP exists; or,

and judging whether GP exists or not directly according to GP indication information in the synchronous channel.

Preferably, the second signal format configuration determining unit is further configured to:

and determining the signal format configuration of the signal transmitted to the first UE by the second UE according to the determined signal format configuration.

The embodiment of the invention provides user equipment, which comprises:

a first signal format configuration determining unit, configured to determine a signal format configuration of a signal that the local UE needs to send to the peer UE;

a signal format indication information sending unit, configured to send the signal format indication information to an opposite UE through a synchronization channel when it is determined that the synchronization channel needs to carry the signal format indication information;

the signal sending unit is used for generating a signal which needs to be sent to the opposite terminal UE by the local terminal UE according to the signal format configuration and sending the signal to the opposite terminal UE;

a second signal format configuration determining unit, configured to determine, according to information carried in the synchronization channel detected by the synchronization channel detecting unit, a signal format configuration adopted by a signal sent by the peer UE to the home UE, and corresponding to the synchronization channel;

and the signal detection unit is used for detecting the signal which is sent to the local terminal UE by the opposite terminal UE and corresponds to the synchronous channel according to the signal format configuration determined by the second signal format configuration determination unit.

The user equipment can be used as both the sending end UE and the receiving end UE, and has the functions of the signal sending device and the signal receiving device.

Drawings

Fig. 1 is a data flow of a conventional terminal direct connection communication;

fig. 2 is a schematic diagram of a transmission scenario of a conventional D2D;

fig. 3 is a schematic diagram of an interference scenario of a conventional D2D transmission;

fig. 4 is a flowchart illustrating a signal sending method according to an embodiment of the present invention;

fig. 5 is a schematic flowchart of a signal receiving method according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a signal transmitting apparatus according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present invention.

Detailed Description

For D2D UEs with different network connection situations or different synchronization source types, the CP and GP configurations may be different. For the receiving end to detect the D2D signals from these UEs respectively, it needs to know the CP type or GP length used by the D2D signal. If the receiving end itself also transmits the D2D signal, in order to ensure that the signals of the surrounding UEs do not generate strong interference, it may be necessary to generate its D2D signal according to the CP type or GP length of the signals of other UEs. In the technical solution provided in the embodiment of the present invention, the UE directly or indirectly knows the CP configuration or GP configuration used by the corresponding D2D signal through the information carried in the synchronization channel, and uses the CP configuration or GP configuration for receiving the corresponding D2D signal or sending the own D2D signal, so as to reduce the interference of the own D2D signal on other signals while ensuring the accuracy of D2D signal detection.

The first UE is a sending end UE, the second UE is a receiving end UE, and the specific scheme provided by the embodiment of the invention comprises the following steps:

the method comprises the following steps: the first UE determines a CP (cyclic prefix) configuration or a GP (guard interval) configuration of a control signal or a data signal.

For example, the control signal may be a signal carried by a control channel of D2D communication, and the data signal may be a D2D discovery signal or a data signal of D2D communication.

The control signal or the data signal is a signal that the first UE needs to send to the second UE.

The CP configuration or GP configuration is a signal format configuration of a signal that the first UE needs to send to the second UE.

The CP is configured as a normal CP or an extended CP, and the GP configuration comprises the GP and/or the length configuration of the GP.

The specific method for determining the CP configuration by the first UE includes one of the following ways:

the first method is as follows: the first UE receives CP configuration information of a network side to determine CP configuration; for example, the network side notifies the CP configuration information through a high-level signaling or a broadcast signaling;

the second method comprises the following steps: the first UE receives CP configuration information forwarded by other UEs and determines CP configuration; for example, other UEs forward the CP configuration information through the synchronization channel;

the third method comprises the following steps: the first UE adopts a pre-configured CP type as CP configuration; for example, for a UE out of network coverage, the pre-configuration adopts the extended CP as the CP configuration.

The specific method for determining the GP configuration by the first UE includes one of the following ways:

the first method is as follows: the method comprises the steps that a first UE receives GP configuration information of a network side to determine GP configuration; for example, the network side notifies GP configuration information through a high-layer signaling or a broadcast signaling, where the configuration information includes indication information of GP size;

the second method comprises the following steps: the method comprises the steps that a first UE receives GP configuration information forwarded by other UEs and determines GP configuration; for example, other UEs forward GP configuration information through a synchronization channel, where the GP configuration information includes indication information of whether to adopt GP;

the third method comprises the following steps: the first UE adopts the pre-configured GP size as the GP configuration, and may adopt different pre-configured GPs for different network connection situations. For example, for the UE in the network coverage, the pre-configuration adopts the GP size of one OFDM symbol as the GP configuration; for the UE out of the network coverage, if the synchronous channel of the UE in the network coverage is received, the pre-configured GP size of one OFDM symbol is used, otherwise, the pre-configuration does not use GP.

It should be noted that, the CP is configured as a CP type, such as a normal CP or an extended CP; here, GP is configured to be GP and/or GP size; for example, the GP size may be 0.5OFDM symbols or 1OFDM symbol or 2OFDM symbols.

Step two: the first UE determines CP indication information required to be carried in a synchronous channel according to the determined CP configuration, or determines GP indication information required to be carried in the synchronous channel according to the determined GP configuration, and when the first UE determines that the signal format indication information is required to be carried in the synchronous channel, the first UE sends the signal format indication information to the second UE through the synchronous channel.

The method for determining the CP indication information required to be carried in the synchronous channel by the first UE according to the determined CP configuration comprises the following steps:

the method comprises the following steps: determining that the CP indication information does not need to be carried in a synchronization channel if the CP of the first UE is configured as a pre-configured CP type; if the CP configuration of the first UE is obtained through CP configuration information of a network side or through CP configuration information forwarded by other UEs, determining that the CP type of a control signal or a data signal corresponding to a synchronous channel needs to be indicated by 1-bit CP indication information in the synchronous channel; specifically, the 1-bit information indicates that a normal CP or an extended CP is used;

the method 2 comprises the following steps: no matter how the CP configuration is obtained, the first UE uses several bits of CP indication information in the synchronization channel to indicate the CP type of the control signal or the data signal corresponding to the synchronization channel. For example, the normal CP or the extended CP is indicated by 1-bit information. For different control signals or data signals (such as D2D discovery signal and D2D communication signal) corresponding to the same synchronization channel, independent CP indication information may be used to indicate the CP type of each signal, or the same CP indication information may be used to indicate that the same CP type is used for each signal.

The method for determining the GP indication information which needs to be carried in the synchronization channel by the first UE according to the determined GP configuration comprises the following steps:

the first UE implicitly indicates GP configuration through other information carried in the synchronous channel and does not carry independent GP indication information in the synchronous channel; or,

the first UE adopts a plurality of bits of GP indication information to indicate GP configuration of a control signal or a data signal corresponding to the synchronization channel in the synchronization channel. For different control signals or data signals (such as D2D discovery signals and D2D communication signals) corresponding to the same synchronization channel, independent GP indication information may be used to indicate the respective GP lengths, or the same GP indication information may be used to indicate that the respective signals use the same GP length. For example, 1 or 2 bits of GP indication information are used to indicate whether a GP is present in the corresponding signal and/or the size of the GP used. For example:

the 1-bit GP indication information indicates whether a GP is present (if present, the length is predefined);

the 1-bit GP indication information indicates that GP size is 0.5OFDM symbol or 1OFDM symbol

The 2-bit GP indication information indicates the following:

indicating index	Indicating the content
		00	Absence of GP
01	GP size of 0.5OFDM symbol
		10	GP size 1OFDM symbol
11	GP size of 2OFDM symbols

When determining that the signal format indication information needs to be carried in a synchronization channel, the first UE sends the signal format indication information to the second UE through the synchronization channel, and the specific method includes: and the first UE sends the length indication information to the second UE through a synchronous channel by adopting preset CP configuration or GP configuration. For example, the signals in the synchronization channel are all transmitted by using the extended CP, or the signals in the synchronization channel are all transmitted by using the GP length of one OFDM symbol.

It should be noted that, for different types of control signals or data signals, the corresponding synchronization channels may be different. Specifically, for the D2D signal, the corresponding Synchronization Channel is typically a Physical Device to Device Synchronization Channel (PD 2 DSCH).

Step three: and the first UE generates and transmits a control signal or a data signal according to the determined CP configuration or GP configuration.

Wherein the control signal or the data signal has at least one of the following association relations with the synchronization channel:

the timing and frequency of the control channel/data channel and the synchronization channel are synchronous, or there is a stipulated offset; for example, the transmission timing of the control channel/data channel is the same as that of the synchronization channel, and the transmission frequency points are also the same;

the physical resources used by the control channel/data channel and the physical resources of the synchronous channel have an agreed mapping relation; for example, the control channel/data channel is transmitted in a plurality of subframes after N subframes sent by the synchronization channel, where N is an agreed fixed value;

the physical resources used by the control channel/data channel are indicated by information in the synchronization channel; for example, the physical resource pool used by the control channel/data channel is indicated by the resource configuration information in the synchronization channel;

the scrambling mode of the control channel/data channel or the Demodulation reference signal (DMRS) configuration is indicated by information in the synchronization channel; for example, the scrambling of the control channel/data channel or the generation of the DMRS sequence is performed according to a synchronization Identification (ID) in the synchronization channel.

Step four: the second UE detects the signal in the synchronous channel and acquires the information carried in the synchronous channel;

the method for detecting the signal in the synchronous channel by the second UE comprises the following steps: the second UE performs detection of a signal in the synchronization channel based on the predefined CP configuration or GP configuration. For example, the signals in the synchronization channel are all detected based on the assumption of the extended CP, or the signals in the synchronization channel are all detected based on the GP length of one OFDM symbol.

The information carried in the synchronization channel includes one or a combination of the following:

synchronization source information of the synchronization channel, such as a synchronization source type of the transmitting UE;

resource configuration information of a signal sent by a first UE to a second UE, for example, resource pool information used by the first UE to send the signal;

CP indication information of a signal sent by the first UE to the second UE, for example, for indicating a CP type;

GP indication information of a signal sent by the first UE to the second UE, for example, for indicating whether a GP exists, and/or a GP size.

Step five: the second UE determines CP configuration or GP configuration used by a control signal or a data signal corresponding to the synchronous channel according to the information in the synchronous channel;

the scrambling mode or DMRS configuration of the control channel/data channel is indicated by information in the synchronization channel; for example, the scrambling of the control channel/data channel or the generation of the DMRS sequence is performed according to a synchronization Identification (ID) in the synchronization channel.

The second UE determines the CP configuration used by the corresponding signal according to the information in the synchronization channel, where the specific determination method includes:

if the synchronous channel does not contain CP type indication information, adopting a pre-configured CP type as CP configuration; if the synchronous channel contains CP type indication information, determining the CP configuration used by the corresponding signal according to the CP type indication information; for example, 1-bit information in the synchronization channel indicates that the normal CP or the extended CP is used. For different control signals or data signals (such as D2D discovery signals and D2D communication signals) corresponding to the same synchronization channel, independent CP indication information may be used to indicate respective CP types, or the same CP indication information may be used to indicate the same CP type for the respective signals.

Or,

determining the CP configuration used by the corresponding signal directly according to the CP type indication information in the synchronous channel; for example, 1-bit information in the synchronization channel indicates that the normal CP or the extended CP is used. For different control signals or data signals (such as D2D discovery signals and D2D communication signals) corresponding to the same synchronization channel, independent CP indication information may be used to indicate respective CP types, or the same CP indication information may be used to indicate that the respective signals use the same CP type.

The determining, by the second UE, the GP configuration used by the corresponding signal according to the information in the synchronization channel specifically includes:

and the UE determines whether the GP exists in the corresponding signal according to the GP indication information or other information in the synchronous channel. If a GP is present, a predefined GP length may be employed.

If the synchronization source type indicated in the synchronization channel is a network side device, such as an eNB, determining that a GP exists; otherwise, determining that no GP exists; or,

if the synchronous channel contains the resource configuration information, determining that GP exists; otherwise, determining that no GP exists; or

If the synchronization source type indicated in the synchronization signal is a network side device, such as an eNB, and the synchronization channel includes resource configuration information, determining that a GP exists; otherwise, determining that no GP exists.

Directly determining whether GP exists according to GP indication information in a synchronous channel; for example, 1 bit GP indication information in the synchronization channel indicates whether there is a GP; for different control signals or data signals (such as D2D discovery signals and D2D communication signals) corresponding to the same synchronization channel, separate GP indication information may be used for indicating respectively, or the same GP indication information may be used for indicating that the signals use the same GP length.

And the UE determines the GP length of the corresponding signal according to the GP indication information in the synchronous channel. For different control signals or data signals (such as D2D discovery signal and D2D communication signal) corresponding to the same synchronization channel, separate GP indication information may be used to indicate or the same GP indication information may be used. For example, for a certain data signal:

the 1-bit GP indication information indicates that the GP size is 0.5OFDM symbol or 1OFDM symbol;

the 2-bit GP indication information indicates the following:

indicating index

Indicating the content

00	Absence of GP
		01	GP size of 0.5OFDM symbol
10	GP size 1OFDM symbol
		11	GP size of 2OFDM symbols

Step six: and the second UE detects a control signal or a data signal corresponding to the synchronous channel according to the determined CP configuration or GP configuration.

Further, the second UE may also determine the CP or GP configuration of the control signal or data signal sent by the second UE according to the determined CP configuration or GP configuration.

Two specific examples are given below.

Example 1: the first UE and the second UE are D2D UEs in network coverage, the first UE sends a discovery signal, and the second UE discovers the first UE through the discovery signal.

The first UE determines a CP type configuration for its discovery signal, which is notified to each UE by the eNB through broadcast signaling. Assume that the CP type of the first UE is configured as a normal CP.

The first UE indicates the CP type used by its discovery signal with 1-bit CP indication information in a synchronization channel (PD 2 DSCH); where 0 denotes a normal CP, 1 denotes an extended CP, and the current indication information is 0. And generating and transmitting the signals in the synchronous channel and the corresponding synchronous signals by adopting a predefined CP type, and assuming that the signals are extended CP. Meanwhile, the synchronization channel also indicates a physical resource pool configured by the eNB and used for the first UE to transmit the discovery signal.

The first UE generates a discovery signal based on a normal CP and transmits the discovery signal on resources in a physical resource pool configured by the eNB; the discovery signal and the synchronous signal/synchronous channel adopt the same sending timing and frequency point.

The second UE detects the synchronous signal of the first UE and the signal in the corresponding synchronous channel, and acquires a synchronous reference (comprising timing information and frequency point information) and CP type indication information and resource configuration information carried in the synchronous channel; wherein the second UE performs detection of the synchronization channel based on the predefined extended CP type.

The second UE learns that the CP of the discovery signal corresponding to the synchronization channel is configured as a normal CP according to the CP type indication information (the bit indication is 0) in the synchronization channel. The second UE acquires a resource region for detecting the discovery signal of the first UE according to the resource configuration information in the synchronous channel;

and the second UE detects the discovery signal of the first UE corresponding to the synchronization channel of the first UE in the determined resource region with the determined synchronization reference based on the determined normal CP type.

Example 2: the first UE is a D2D UE within network coverage and the second UE is a D2D UE outside network coverage, wherein the first UE transmits D2D broadcast communication signals and the second UE receives D2D broadcast communication signals.

And the first UE determines the GP configuration used by the broadcast communication signal according to the network coverage condition of the first UE. Since the first UE is in network coverage, the GP used by it to broadcast the communication signal is one OFDM symbol long GP and in the last symbol of the subframe.

The first UE implicitly indicates the GP configuration used by the broadcast communication signal of the first UE through synchronization source information and resource configuration information carried in a synchronization channel (PD 2 DSCH), and does not carry independent GP indication information in the synchronization channel. The first UE sends synchronization source information and resource configuration information in a synchronization channel, wherein the synchronization source information indicates that the synchronization source type of the first UE is eNB, and the resource configuration information indicates a resource pool used for broadcast communication signal transmission of the first UE. The signals in the synchronization channel are all generated and transmitted based on the GP length of a predefined OFDM symbol, i.e. the last symbol does not transmit a signal.

And the first UE generates and sends a broadcast communication signal corresponding to the synchronous channel according to GP configuration of one OFDM symbol length. Specifically, the last OFDM symbol of the broadcast communication signal is a GP in which no signal is transmitted. The broadcast communication signal and the synchronous signal/synchronous channel adopt the same transmitting frequency point, but the timing between the broadcast communication signal and the synchronous signal/synchronous channel has a well-agreed offset.

And the second UE detects the synchronous signal of the first UE and the signal in the synchronous channel and acquires the synchronous reference and the synchronous source information and the resource configuration information carried in the synchronous channel. Wherein the second UE performs detection of the synchronization channel based on a pre-defined GP length of one OFDM symbol.

The second UE knows that the synchronization source of the first UE is eNB according to the synchronization source information in the synchronization channel, and the synchronization channel carries the resource configuration information, thereby determining that GP exists in the broadcast communication signal of the first UE, and the length is the predefined length (1 OFDM symbol). The second UE knows the physical resource region used by the first UE for broadcasting the communication signal from the resource configuration information.

The second UE detects the broadcast communication signal of the first UE corresponding to the synchronization channel of the first UE in the determined physical resource region with the determined synchronization reference based on the determined GP configuration of one OFDM symbol length, that is, it is assumed that the last OFDM symbol of the broadcast communication signal is not transmitted;

the second UE determines that the first UE is an in-network-coverage UE according to other information in the synchronization channel, and further uses the GP configuration of the first UE as the GP configuration of its own broadcast communication signal, that is, the broadcast communication signal of the second UE is also generated based on the GP length of one OFDM symbol.

In summary, referring to fig. 4, at a sending end, a signal sending method provided in an embodiment of the present invention includes:

s101, the first UE determines the signal format configuration of a signal needing to be sent to the second UE;

s102, the first UE determines signal format indication information which needs to be carried in a synchronous channel according to the signal format configuration;

s103, when the first UE determines that the signal format indication information needs to be carried in a synchronous channel, the first UE sends the signal format indication information to a second UE through the synchronous channel;

and S104, the first UE generates the signal which needs to be sent to the second UE according to the signal format configuration and sends the signal to the second UE.

the first UE indicates GP configuration through information carried in a synchronous channel; or,

the first UE adopts GP configuration indication information of one or more bits in a synchronous channel to indicate GP configuration of a signal sent to a second UE by the first UE carried in the synchronous channel.

the scrambling scheme or DMRS configuration of the channel used to transmit the signal that the first UE needs to send to the second UE is indicated by information in the synchronization channel.

Correspondingly, at the receiving end, referring to fig. 5, a signal receiving method provided in an embodiment of the present invention includes the steps of:

s201, detecting a signal in a synchronous channel by a second UE, and acquiring information carried in the synchronous channel;

s202, the second UE determines the signal format configuration adopted by the signal sent to the second UE by the first UE corresponding to the synchronous channel according to the information carried in the synchronous channel;

s203, the second UE detects the signal sent by the first UE to the second UE corresponding to the synchronous channel according to the signal format configuration.

synchronization source information of a first UE;

resource configuration information of a first UE;

if the synchronous channel contains the resource configuration information of the first UE, the second UE determines that GP exists; otherwise, determining that no GP exists; or,

Preferably, the method further comprises:

Correspondingly to the above method, referring to fig. 6, a signal transmitting apparatus according to an embodiment of the present invention includes:

a first signal format configuration determining unit 11, configured to determine a signal format configuration of a signal that needs to be sent by a first UE to a second UE;

a signal format indication information determining unit 12, configured to determine, according to the signal format configuration, signal format indication information that needs to be carried in a synchronization channel;

a signal format indication information sending unit 13, configured to send the signal format indication information to the second UE through the synchronization channel when it is determined that the synchronization channel needs to carry the signal format indication information;

and a signal sending unit 14, configured to generate the signal to be sent to the second UE according to the signal format configuration, and send the signal to the second UE.

Accordingly, referring to fig. 7, a signal receiving apparatus provided in an embodiment of the present invention includes:

a synchronization channel detection unit 21, configured to detect a signal in a synchronization channel and obtain information carried in the synchronization channel;

a second signal format configuration determining unit 22, configured to determine, according to the information carried in the synchronization channel, a signal format configuration adopted by a signal sent by the first UE to the second UE, where the signal format configuration is corresponding to the synchronization channel;

and a signal detection unit 23, configured to detect, according to the signal format configuration, a signal sent by the first UE to the second UE, where the signal is corresponding to the synchronization channel.

synchronization source information of a first UE;

resource configuration information of a first UE;

The user equipment provided by the embodiment of the invention comprises the signal sending device and/or the signal receiving device.

In summary, in the technical solution provided in the embodiment of the present invention, the UE directly or indirectly knows the CP configuration or GP configuration used by the corresponding D2D signal through the information carried in the synchronization channel, and uses the CP configuration or GP configuration for receiving the corresponding D2D signal or transmitting the own D2D signal, so as to ensure the accuracy of detecting the D2D signal and reduce the interference of the own D2D signal to other signals. Specifically, after acquiring the CP configuration of the D2D signal, the UE does not need to traverse different CP configurations for detection during detection, so that the detection complexity of receiving the UE can be effectively reduced; after acquiring the GP configuration of the D2D signal, the UE can directly perform rate-matching (rate-matching) on the GP during detection, and the rate-matching is consistent with the sending end, so that the accuracy of D2D signal detection is ensured; after knowing the CP or GP configuration used by the surrounding cellular UEs or D2D UEs, the UE can generate its D2D signal according to the CP or GP configuration, thereby reducing interference to the surrounding cellular UEs or D2D UEs.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

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

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for signaling, the method comprising:

2. The method of claim 1, wherein determining, by the first UE, a signal format configuration of a signal to be transmitted to the second UE comprises:

3. The method according to claim 2, wherein the signal format is configured as a cyclic prefix, CP, type configuration or a signal guard interval, GP, configuration.

4. The method of claim 3, wherein the cyclic prefix is configured as a normal CP or an extended CP, and wherein the signal guard interval (GP) configuration comprises whether GP and/or GP length configuration is adopted.

5. The method of claim 3, wherein when the signal format configuration is a Cyclic Prefix (CP) type configuration, the determining, by the first UE, signal format indication information required to be carried in a synchronization channel according to the signal format configuration comprises:

when the first UE determines the CP type configuration of the signal which needs to be sent to the second UE through the first mode or the second mode, the first UE determines that 1-bit CP type indication information needs to be adopted in a synchronous channel and indicates the CP type of the signal which is sent to the second UE by the first UE; or,

the first UE adopts one or more bits of CP type indication information in a synchronous channel to indicate the CP type of a signal sent by the first UE to the second UE.

6. The method according to claim 3, wherein when the signal format configuration is a signal guard interval (GP) configuration, the determining, by the first UE, signal format indication information required to be carried in a synchronization channel according to the signal format configuration includes:

7. The method of claim 1, wherein the first UE sends the length indication information to the second UE through a synchronization channel, comprising: and the first UE sends the length indication information to the second UE through a synchronous channel by adopting preset signal format configuration.

8. The method of claim 1, wherein the first UE needs to send a signal to the second UE, and wherein the synchronization channel has at least one of the following associations:

9. A signal receiving method, comprising:

10. The method of claim 9, wherein the second UE detects the signal in the synchronization channel, comprising:

11. The method of claim 9, wherein the signal in the synchronization channel comprises one or a combination of the following information:

synchronization source information of a first UE;

resource configuration information of a first UE;

12. The method of claim 9, wherein the signal sent by the first UE to the second UE has at least one of the following associations with the synchronization channel:

13. The method of claim 9, wherein the signal format is configured as a Cyclic Prefix (CP) configuration or a signal guard interval (GP) configuration.

14. The method of claim 13, wherein the cyclic prefix is configured as a normal CP or an extended CP, and wherein the signal guard interval (GP) configuration comprises whether a GP and/or a length configuration of a GP is employed.

15. The method of claim 13, wherein when the signal format is configured as a Cyclic Prefix (CP) type configuration, the second UE determines, according to information carried in the synchronization channel, a CP type configuration adopted by a signal sent by the first UE to the second UE, and the CP type configuration is corresponding to the synchronization channel, and the method includes:

16. The method according to claim 13, wherein when the signal format configuration is a signal guard interval GP configuration, the second UE determines, according to information carried in the synchronization channel, a signal format configuration adopted by a signal sent by the first UE to the second UE, and the signal format configuration includes:

17. The method of claim 16, wherein the second UE determines whether there is a GP in a signal sent by the first UE to the second UE corresponding to the synchronization channel according to GP configuration indication information or other information in the synchronization channel, including:

18. The method of claim 9, further comprising:

19. A signal transmission apparatus, characterized in that the apparatus comprises:

20. The apparatus of claim 19, wherein the first signal format configuration determining unit determines the signal format configuration of the signal that the first UE needs to send to the second UE specifically by one of:

21. The apparatus of claim 20, wherein the signal format is configured as a Cyclic Prefix (CP) configuration or a signal guard interval (GP) configuration.

22. The apparatus of claim 21, wherein the cyclic prefix is configured as a normal CP or an extended CP, and wherein the signal guard interval (GP) configuration comprises whether a GP and/or a length configuration of a GP is employed.

23. The apparatus according to claim 21, wherein when the signal format configuration is a cyclic prefix, CP, type configuration, the signal format indication information determining unit is specifically configured to:

24. The apparatus according to claim 21, wherein when the signal format configuration is a signal guard interval GP configuration, the signal format indication information determining unit is specifically configured to:

25. The apparatus of claim 19, wherein the signal format indicator sending unit, when sending the length indicator to the second UE through a synchronization channel, is specifically configured to: and sending the length indication information to the second UE through a synchronous channel by adopting preset signal format configuration.

26. The apparatus of claim 19, wherein the signal that the first UE needs to send to the second UE has at least one of the following association relationships with the synchronization channel:

27. A signal receiving apparatus, comprising:

28. The apparatus of claim 27, wherein the synchronization channel detecting unit, when detecting the signal in the synchronization channel, is specifically configured to: and detecting the signal in the synchronous channel based on the preset signal format configuration.

29. The apparatus of claim 27, wherein the signal in the synchronization channel comprises one or a combination of the following information:

synchronization source information of a first UE;

resource configuration information of a first UE;

30. The apparatus of claim 27, wherein a signal sent by a first UE to a second UE has at least one of the following associations with the synchronization channel:

31. The apparatus of claim 27, wherein the signal format is configured as a Cyclic Prefix (CP) configuration or a signal guard interval (GP) configuration.

32. The apparatus of claim 31, wherein the cyclic prefix is configured as a normal CP or an extended CP, and wherein the signal guard interval (GP) configuration comprises whether a GP and/or a length configuration of a GP is employed.

33. The apparatus according to claim 31, wherein when the signal format configuration is a cyclic prefix, CP, type configuration, the second signal format configuration determining unit is specifically configured to:

34. The apparatus according to claim 31, wherein when the signal format configuration is a signal guard interval GP configuration, the second signal format configuration determining unit is specifically configured to:

35. The apparatus according to claim 34, wherein the second signal format configuration determining unit, when determining whether there is a GP in a signal sent by the first UE to the second UE and corresponding to the synchronization channel according to GP configuration indication information or other information in the synchronization channel, is specifically configured to:

36. The apparatus of claim 27, wherein the second signal format configuration determining unit is further configured to:

37. A user equipment, characterized in that the user equipment comprises: