WO2018090741A1

WO2018090741A1 - Signal processing method and device

Info

Publication number: WO2018090741A1
Application number: PCT/CN2017/103970
Authority: WO
Inventors: 杜振国; 韩云博; 程勇; 容志刚
Original assignee: 华为技术有限公司
Priority date: 2016-11-16
Filing date: 2017-09-28
Publication date: 2018-05-24

Abstract

Provided by the embodiments of the present application are a method and device for signal processing. The method comprises: a first device receiving a first message sent by a second device; the first device determining a target duration of a synchronization signal according to the first message; the first device generating a second message according to the target duration of the synchronization signal, the second message comprising the synchronization signal, and the duration of the synchronization signal being the target duration; and the first device sending the second message to the second device. The first device of the embodiments of the present application may determine an appropriate duration of a synchronization signal according to a first message sent by the second device and may send to the second device a second message that comprises the synchronization signal having the target duration as the duration thereof, thereby avoiding the waste of channel resources caused by sending a second message which comprises a redundant synchronization signal duration and improving the utilization of channel resources.

Description

Signal processing method and device

Technical field

The present application relates to the field of communications and, more particularly, to methods and apparatus for signal processing.

Background technique

The Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard organization plans to develop a Wireless Fidelity Internet of Things (WiFi IoT) standard based on the 2.4G/5GHz band, which is characterized by low power. Consumption and long distance. One existing method is to reduce power consumption by using Low Power (LP) Wake-up Radio (WUR) on the WiFi IoT device side. The wake-up radio is also known as the Wake-up Receiver (WUR).

The frame that can be received by the WUR is called a WUR frame. In the prior art, the frame structure of the WUR frame may include a synchronization signal (Synchronization, SYNC) and a starting frame delimiter (SFD), which is related to 802.11b. Similarly, the role of SYNC is to allow the receiver to synchronize timing with the sender. The SYNC portions of the two frame formats supported by 802.11b are 128-bit all-one sequence and 56-bits all-one sequence, respectively, and the length of the SYNC portion is fixed. The use of a fixed length SYNC is usually considered in the worst case scenario, ie the SYNC length required to complete the timing synchronization in the worst case scenario. Obviously, this length is longer. While actual communication is not always in the worst case, it is not necessary to always use the most conservative SYNC length. Therefore, transmission of a WUR frame including a fixed length SYNC signal in the prior art causes waste of channel resources.

Summary of the invention

The embodiment of the present application provides a method and a device for signal processing, which can improve utilization of channel resources.

In a first aspect, a method for signal processing is provided, the method includes: receiving, by a first device, a first message sent by a second device; and determining, by the first device, a target duration of the synchronization signal according to the first message; A device generates a second message according to the target duration of the synchronization signal, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration; the first device sends the second message to the second device.

The first device of the embodiment of the present application receives the first message sent by the second device, determines a target duration of the synchronization signal according to the first message, and generates a second message, where the second message includes a synchronization signal, and the second message includes The duration of the synchronization signal is the target duration, and the second message is sent to the second device, so that the second device synchronizes with the first device, so that the second message sent by the first device to the second device is relatively short, but It is enough for the second device to complete the synchronization signal of the synchronization function, thereby reducing the waste of media resources and improving the efficiency of media utilization.

In some possible implementations, the first message carries a desired duration of the synchronization signal, where the expected duration represents a duration of the synchronization signal required by the second device to complete synchronization with the first device; wherein the first device Determining, according to the first message, the target duration of the synchronization signal includes: determining, by the first device, the target duration according to the expected duration, the target duration being greater than or equal to the expected duration.

After the first device receives the expected duration (represented as L ₀ ) transmitted by the second device, the target duration of the synchronization signal (denoted as L) is determined according to L ₀ . L is not less than L ₀ , and preferably L = L ₀ . In this way, the first message carries the desired duration, and the first device can determine the target duration of the synchronization signal, which saves power consumption of the first device.

In some possible implementations, before the first device receives the first message sent by the second device, the method further includes: the first device sending a third message to the second device on the first channel, to Having the second device measure the first channel according to the third message The channel quality is used to generate a channel quality measurement result of the first channel, and the expected duration of the synchronization signal is determined according to the channel quality measurement result of the first channel.

The first device may send a third message to the second device, so that the second device determines, according to the third message, a channel quality measurement result between the first device and the second device, so that the second device can be based on the channel quality measurement result. The desired duration is determined more accurately, so that the first device can accurately determine the target duration according to the expected duration, thereby further improving the media utilization efficiency.

In some possible implementations, the receiving, by the first device, the first message sent by the second device includes: receiving, by the first device, the first message sent by the second device on the first channel; wherein the first device is configured according to the first device Determining, by the first message, the target duration of the synchronization signal, the first device, according to the first message, measuring a channel quality of the first channel, and generating a channel quality measurement result of the first channel; The channel quality measurement result of the first channel determines a target duration of the synchronization signal.

Receiving, by the first device, the first message on the first channel, determining channel quality of the first channel according to the first message, and generating a channel quality measurement result of the first channel, so that the first device can be configured according to the channel of the first channel The quality measurement result determines the target duration of the synchronization signal, that is, the first device uses the channel quality of the second device to the first device direction according to the channel dissimilarity as the channel quality of the first device to the second device direction, that is, the first device. The channel quality can be learned without separately transmitting the channel measurement information, so that the overhead of the first device can be reduced.

In some possible implementations, the method further includes: before the first device receives the first message sent by the second device, the first device sends a third message to the second device on the first channel, where The third message is used by the second device to measure channel quality of the first channel and generate a channel quality measurement result of the first channel; the first message carries a channel quality measurement result of the first channel; wherein the first device Determining, according to the first message, the target duration of the synchronization signal, the first device determining, according to the channel quality measurement result of the first channel, a target duration of the synchronization signal.

The first device may send a third message to the second device, so that the second device determines, according to the third message, a channel quality measurement result between the first device and the second device, where the first device receives the channel quality sent by the second device The measurement result is such that the first device can determine the target duration more accurately according to the channel quality measurement result, and does not require the second device to determine the expected duration according to the channel measurement result, thereby saving power consumption of the second device.

In some possible implementations, the method further includes: before the first device receives the first message sent by the second device, the first device receives the receiving capability information sent by the second device, where the receiving capability information is Determining, by the first device, the receiving capability of the second message, where the determining, by the first device, the target duration of the synchronization signal, according to the channel quality measurement result of the first channel, that the first device is configured according to the channel of the first channel The quality measurement result and the reception capability information determine the target duration of the synchronization signal.

The first device can accurately determine the target duration of the synchronization signal according to the channel quality measurement result and the receiving capability information of the second device. The method is the most direct and accurate, thereby improving the accuracy of determining the target duration.

In some possible implementations, the first channel includes at least one subchannel, and the sending, by the first device, the second message to the second device includes: at least one of the first device in the first channel The second message is sent to the second device on the channel.

When the first device sends the second message to the second device, the channel that has been used before is used, or the subchannel of the used channel, for example, the channel that has been used may be when the first device sends the third message to the second device. The channel used, or may also be the channel used by the second device to send the second message to the first device. In this way, by using the channel that has been used, the first device can avoid using the faulty channel and improve the efficiency of transmitting the second message.

A second aspect provides a method for signal processing, the method comprising: sending, by a second device, a first message to a first device, where the first message is used by the first device to determine a target duration of the synchronization signal, and generating a second a message, the second message includes the synchronization signal, the duration of the synchronization signal is the target duration; the second device receives the second message sent by the first device; and the second device is configured according to the synchronization signal in the second message , synchronizing with the first device.

The second device sends a first message to the first device, so that the first device determines a target duration of the synchronization signal according to the first message, and generates a second message according to the target duration, where the second message includes a synchronization signal, and the The duration of the synchronization signal included in the second message is the target duration, and the second message sent by the first device is received, and the second device synchronizes with the first device according to the synchronization signal in the second message, so that the first device and the first device The negotiation of the second device is such that the second message is a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing media resource waste and improving media utilization efficiency.

In some possible implementations, the method further includes: the second device determining a desired duration of the synchronization signal, the expected duration of the synchronization signal indicating a synchronization signal required by the second device to complete synchronization with the first device The duration of the first message sent by the second device to the first device includes: the second device transmitting, to the first device, the first message that carries the synchronization signal for a desired duration.

The second device determines the duration (indicated as the expected duration) of the synchronization signal required to synchronize with the first device, and sends the first message to the first device, so that the first device can be accurate according to the expected duration of time carried in the first message. The target time is determined, thereby saving the power consumption of the first device.

In some possible implementations, the method further includes: receiving, by the second device, a third message, where the third message is used to measure channel quality of the first channel; and determining, by the second device, the first a channel quality measurement result of the channel, wherein the determining, by the second device, the expected duration of the synchronization signal comprises: determining, by the second device, a desired duration of the synchronization signal according to the channel quality measurement result of the first channel.

The second device receives the third message, and determines a channel quality measurement result according to the third message, so that the second device can accurately determine the expected duration according to the channel quality measurement result, and send the expected duration to the first device, so that the first The device can accurately determine the target duration, thereby further improving the efficiency of media utilization.

In some possible implementations, the method further includes: receiving, by the second device, a third message, where the third message is used to measure channel quality of the first channel; and determining, by the second device, the first The channel quality measurement result of the channel, wherein the sending, by the second device, the first message to the first device includes: sending, by the second device, the first message that carries the channel quality measurement result of the first channel to the first device.

The second device determines the channel measurement result according to the third message, and sends the channel measurement result to the first device, where the first device determines the target duration according to the channel measurement result, so that the second device does not need to determine the expected duration according to the channel measurement result, thereby saving the second The power consumption of the device.

A third aspect provides a method for determining a length of a synchronization signal for sending a message, where the method includes: receiving, by a first device, a first message sent by a second device by using a first interface or a second interface, where the first device is based on Determining a synchronization signal length L; the first device generates a second message, where the second message includes a first synchronization signal, the length of the first synchronization signal is L; An interface sends the second message to the second device.

In some possible implementations, before the first device receives the first message sent by the second device by using the first interface or the second interface, the first device passes the first interface or the second interface. Sending a third message, so that the second device measures the channel based on the third message, and obtains a channel measurement result; wherein, the channel used by the first device to send the third message is a first channel, The channel used by the first device to send the second message is a second channel, the second channel is a subchannel of the first channel, and the channel measurement result includes at least the second device pair The measurement result of the second channel is described.

In some possible implementations, the first device receives the first message sent by the second device by using the second interface, where the first device determines the synchronization signal length L based on the first message, including: the first The channel includes the channel measurement result, and the first device determines the synchronization signal length L based on the channel measurement result.

In some possible implementations, the first device receives the first message sent by the second device by using the second interface, where the first device determines the synchronization signal length L based on the first message, including: the first length L ₀ of the synchronizing signal message comprises a second desired device, said first device based on the determination of the L ₀ L, wherein, L≥L _0.

In some possible implementation manners, the determining, by the first device, the synchronization signal length L based on the first message, includes: the first device, according to the first message measurement channel, obtaining a channel measurement result, and based on the The channel measurement result determines a synchronization signal length L, wherein the channel used by the second device to send the first message is a third channel, and the channel used by the first device to send the second message is a second channel, The second channel is a subchannel of the third channel, and the channel measurement result includes at least a measurement result of the first device to the second channel.

In some possible implementations, the second interface is a primary communication interface.

In a fourth aspect, a first device is provided, where the first device can communicate with a second device, where the first device includes: receiving, by the first device, the first device, by using the first interface or the second interface a determining unit, configured to determine a synchronization signal length L based on the first message, a generating unit, configured to generate a second message, where the second message includes a first synchronization signal, and the length of the first synchronization signal is After receiving the first message, the first interface is further configured to send the second message to the second device.

In some possible implementations, the first interface or the second interface is further configured to: before the first device receives the first message sent by the second device by using the first interface or the second interface, The first device sends a third message by using the first interface or the second interface, so that the second device measures the channel based on the third message, and obtains a channel measurement result; where the first device sends the The channel used by the third message is a first channel, the channel used by the first device to send the second message is a second channel, and the second channel is a subchannel of the first channel, The channel measurement result includes at least the measurement result of the second device by the second device.

In some possible implementations, the second interface is configured to receive a first message sent by the second device, and the determining unit is configured to determine a synchronization signal length L based on the first message, including: The channel measurement result is included in a message, and the first device determines the synchronization signal length L based on the channel measurement result.

In some possible implementations, the second interface is configured to receive a first message sent by the second device, and the determining unit is configured to determine a synchronization signal length L based on the first message, including: A message includes a synchronization signal length L ₀ desired by the second device, and the first device determines the L based on the L0, where L≥L ₀ .

In some possible implementations, the determining unit, configured to determine a synchronization signal length L based on the first message, includes: the first device, according to the first message measurement channel, obtain a channel measurement result, and based on the The channel measurement result determines a synchronization signal length L. The channel used by the second device to send the first message is a third channel, and the channel used by the first device to send the second message is a second channel. The second channel is a subchannel of the third channel, and the channel measurement result includes at least a measurement result of the first device to the second channel.

In some possible implementations, the first interface is a wake-up radio interface, and the second interface is a main communication interface.

In a fifth aspect, a first device is provided, the first device comprising means for performing the method of the first aspect or any of the possible implementations of the first aspect.

In a sixth aspect, a second device is provided, the second device comprising means for performing the method of the second aspect or any of the possible implementations of the second aspect.

In a seventh aspect, a signal processing system is provided, the system comprising:

The first device of the fifth aspect/fourth aspect and the second device of the sixth aspect described above.

In an eighth aspect, the application provides a first device, including: a processor, a memory, and a communication interface. The processor is coupled to the memory and communication interface. The memory is for storing instructions for the processor to execute, and the communication interface is for communicating with other network elements under the control of the processor. When the processor executes the instructions stored by the memory, the executing causes the processor to perform the method of the first aspect or any possible implementation of the first aspect, or the execution causes the processor to perform the third aspect or the third aspect The method in any possible implementation.

In a ninth aspect, the application provides a second device, including: a processor, a memory, and a communication interface. The processor is coupled to the memory and communication interface. The memory is for storing instructions for the processor to execute, and the communication interface is for communicating with other network elements under the control of the processor. When the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of any of the possible implementations of the second aspect or the second aspect.

In a tenth aspect, the present application provides a computer storage medium having stored therein program code for indicating a signal in performing any of the above first aspect or the first aspect of the first aspect. An instruction of the method of processing, or the program code is for indicating an instruction to perform the method of signal processing in any of the possible implementations of the third aspect or the third aspect above.

In an eleventh aspect, the present application provides a computer storage medium having stored therein program code for indicating execution of any of the possible implementations of the second aspect or the second aspect described above. Instructions for the method of signal processing.

Receiving, by the first device, the first message sent by the second device, determining a target duration of the synchronization signal according to the first message, and generating a second message, and sending the second message to the second device, so that the first device can be configured according to the first The first message sent by the two devices determines the target duration of the appropriate synchronization signal, thereby avoiding waste of channel resources caused by the second message including the redundant synchronization signal duration, and improving channel resource utilization.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiments or the prior art description will be briefly described below.

Figure 1 is an architectural diagram of a low power wake-up system;

2 is a specific design of a wake-up package in the prior art;

3 is a transmission mode of a wake-up packet in the prior art;

4 is a frame structure of a WUR frame according to an embodiment of the present application;

5 is a frame structure of a frame conforming to the 802.11b standard in the prior art;

6 is a schematic interaction flowchart of a method of signal processing according to an embodiment of the present application;

7 is a schematic diagram of a method of signal processing according to still another embodiment of the present application;

FIG. 8 is a schematic structural diagram of a synchronization signal according to an embodiment of the present application; FIG.

9 is a schematic structural diagram of a synchronization signal according to an embodiment of the present application;

FIG. 10 is a schematic diagram of a method of signal processing according to an embodiment of the present application; FIG.

11 is a schematic diagram of a method of signal processing according to still another embodiment of the present application;

FIG. 12 is a schematic diagram of a method of signal processing according to still another embodiment of the present application; FIG.

FIG. 13 is a schematic interaction flowchart of a method for signal processing according to still another embodiment of the present application; FIG.

14 is a schematic interaction flowchart of a method of signal processing according to still another embodiment of the present application;

15 is a schematic interaction flowchart of a method of signal processing according to still another embodiment of the present application;

16 is a schematic block diagram of a first device of an embodiment of the present application;

17 is a schematic block diagram of a second device of an embodiment of the present application;

18 is a schematic block diagram of a system for signal processing according to an embodiment of the present application;

19 is a schematic structural diagram of a first device according to an embodiment of the present application;

20 is a schematic structural diagram of a second device according to an embodiment of the present application;

21 is an interaction flowchart of an embodiment of the present application;

22 is an interaction flowchart of another embodiment of the present application;

23 is an interaction flowchart of still another embodiment of the present application;

24 is an interaction flowchart of still another embodiment of the present application;

25 is an interaction flowchart of still another embodiment of the present application;

Figure 26 is a schematic view showing the structure of still another embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments. It is apparent that the described embodiments are part of the embodiments of the present application, and not all of them.

The embodiment of the present application can be applied to a Wireless Local Area Network (WLAN). Currently, the standard adopted by the WLAN is the Institute of Electrical and Electronics Engineers (IEEE) 802.11 series. The WLAN may include multiple Basic Service Sets (BSSs), the network nodes in the BSS are stations (Stations, STAs), and the STAs include access points (APs) and non-access points of the access point class. Site (none Access Point Station, non-AP STA). Each BSS may include one AP and multiple non-AP STAs associated with the AP.

APs are also called wireless access points or hotspots. The AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors. An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet. Specifically, the AP may be a terminal device or a network device with a Wireless Fidelity (WiFi) chip. Optionally, the AP may be a device supporting the 802.11ax system. Further, the AP may be a device supporting multiple WLAN technologies such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a or subsequent versions.

The non-AP STA may be a wireless communication chip, a wireless sensor, or a wireless communication terminal. For example: mobile phone supporting WiFi communication function, tablet computer supporting WiFi communication function, set-top box supporting WiFi communication function, smart TV supporting WiFi communication function, smart wearable device supporting WiFi communication function, and vehicle communication supporting WiFi communication function Devices and computers that support WiFi communication. Optionally, the site can support the 802.11ax system. Further optionally, the site supports multiple WLAN formats such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a or subsequent versions. A non-AP STA may also be simply referred to as an STA.

Figure 1 shows an architectural diagram of a low power wake-up system. The station (STA) introduces an LP-WUR interface based on the traditional WiFi interface (ie, the 802.11 main radio). The STA's LP-WUP is continuously in the receiving state, or intermittently in the receiving state. When the LP-WUR receives the Wake-up Packet from the AP in the receiving state, it sends a wake-up signal to the 802.11 main communication module to Wake up the 802.11 master communication module in hibernation and then communicate with the AP. The AP may logically include an 802.11 primary communication module and a WUR module. However, for the current 802.11 standard, the 802.11 primary communication module is often an OFDM wideband signal, and the WUR wakeup signal is a narrowband signal, for cost reduction and simple structure. It is contemplated that a narrowband WUR wake-up signal can be generated using an OFDM wideband transmitter. For example, a partial subcarrier of the OFDM signal is vacant and the signal is transmitted only on the narrowband corresponding to the WUR wakeup signal, thereby generating a narrowband signal. This is an example of generating a WUR narrowband signal by using an OFDM wideband transmitter, as shown in FIG. A main communication module for transmitting and receiving signals.

It should be specially noted that the 802.11 main communication module and the WUR module can also be implemented separately in the specific implementation of the AP. In addition, in Figure 1, both the AP and the STA have only one antenna. This is mainly because the 802.11 main communication module and the WUR module use the same frequency band carrier (for example, 2.4 GHz), and the same antenna can be shared to save cost and simplify the device structure. However, when the 802.11 primary communication module and the WUR module use different frequency band carriers, the two should be configured with different antennas. For example, the 802.11 primary communication module uses the 5 GHz band, and the WUR module uses the 2.4 GHz band. In this case, the two should correspond to different antennas.

The reason why STA uses WUR compared to the direct use of 802.11 main communication module can reduce power consumption. The main reason is that the receiving and decoding of wake-up packets is much simpler than traditional 802.11 frames. The wake-up packet usually adopts a modulation method that is easy to receive at the receiving end, such as on-off key (OOK) modulation. Taking OOK modulation as an example, the receiving end judges the information carried by the receiving signal by the presence or absence of energy, for example, the energy is 1, and the energy is zero. The traditional 802.11 frame adopts Orthogonal Frequency Division Multiplexing (OFDM), Binary Convolutional Code (BCC)/Low-density Parity Check (LDPC) at the transmitting end. Correspondingly, the receiving end needs to perform complex signal processing operations such as Fast Fourier Transform (FFT) and Forward Error Correction (FEC) decoding, which require a lot of energy.

The 802.11 main radio of the STA in FIG. 1 may also be other communication interfaces, such as Long Term Evolution (LTE). A module for data communication, collectively referred to as a main communication module or a main communication interface (main radio), such as an LTE, WiFi module; a module for wake-up of a device, collectively referred to as a wake-up radio frequency (WUR) module or a wake-up radio interface.

Figure 2 shows a specific design of a wake-up package in the prior art. As shown in Figure 2, Legacy Short Training Field (L-STF), Legacy Long Training Field (L-LTF), and legacy signaling domain (Legacy Signal, L-SIG) Corresponding to the preamble part of the traditional 802.11, for backward compatibility, and transmitting by OFDM on a bandwidth of 20 MHz (or an integer multiple of 20 MHz), so that the traditional WiFi device can judge that the current packet is a WiFi packet, thereby Select the appropriate channel listening decision threshold. If backward compatibility is not considered, L-STF, L-LTF, and L-SIG may not exist. The Payload portion of the wake-up packet uses an easy-to-demodulate modulation scheme, such as On-Off Key (OOK) modulation (such as Amplitude Shift Keying (ASK)), which allows for narrower bandwidth. Up-conversion, such as 2MHz channel, 4MHz channel, 5MHz channel, etc. (the traditional WiFi minimum channel is 20MHz), makes the energy consumption of the receiving end smaller.

The wake-up payload (Wayload) includes the Wake-up preamble and the Medium Access Control (MAC) part. The wake-up front part is similar to the STF and LTF in the traditional WiFi for synchronization and automatic gain control (Automatic Gain Control (AGC) and channel estimation; the media intervention control part is similar to the MAC part of the traditional WiFi frame, and further includes a MAC header, a Frame Body, a Frame Check Sequence (FCS), and a MAC. Some may use simple code coding such as repetition code, spreading code, Manchester code, etc. to improve reliability, but it is also possible to not use channel coding. The Wake-up preamble includes a sequence of specific sequences. The WUR of the STA may not receive the previous Legacy preamble part, but directly detects the specific sequence to identify the beginning of the wake-up packet. When the WUR of the STA receives the wake-up packet and detects its own identity (unicast/multicast/broadcast address) from the MAC portion of the wake-up packet, it sends a wake-up signal to the 802.11 primary communication module. For the sake of transmission efficiency, the wake-up packet can be free of Legacy 802.11 preamble, and the MAC part can also be used without channel coding. In addition to OOK, the Payload section can also use other modulation methods that are easy to demodulate, such as Frequency Shift Keying (FSK).

If the STA's WUR is active for a long time, it will obviously consume more power. A compromise is that the WUR is intermittently active. The appearance of such a wake window should be regular so that the AP can know when the WUR of the STA can receive the wake-up packet. For example, WUR is active for 2ms every 100ms, as shown in Figure 3. When the AP has data to send to the STA, the wake-up packet can be sent in the wake-up window of the STA, thereby waking up the STA's 802.11 main communication module. Of course, the wake-up window may not be introduced, that is, the WUR of the STA is always in the listening state, which makes the AP wake up the STA at any time, which is beneficial to reducing the wake-up delay. The disadvantage is that the STA consumes more power.

The above frame structure can be used not only for wake-up packets, but also for other frames received by the WUR, such as sync frames for synchronization functions. Frames that can be received by the WUR in the above format are collectively referred to as WUR frames. Since the function of the WUR frame is relatively simple, the frame body in the MAC part may not exist.

A frame structure of a Wake-up Preamble is composed of a synchronization signal (Synchronization, SYNC), a Starting Frame Delimiter (SFD), and a Signaling Domain (Signal, SIG), as shown in FIG. Where the synchronization signal is a series of repetitions The signal waveform, for example, the waveform generated by OOK modulation of 10101010..., the receiving end realizes clock synchronization based on the detection of the repeated waveform; the starting frame delimiter is usually a predefined fixed sequence for performing the frame start position. Identification, that is, when the receiving end detects the predefined SFD sequence based on the synchronization signal, it is considered to be the start of a WUR frame; the signaling domain is used to carry the MAC part control information, such as the length of the MAC part, and the transmission rate. Etc. If the WUR length is fixed and only a specific transmission rate is used, the SIG may not exist.

Since the WUR frame adopts a simple modulation method such as OOK, the receiving end often needs to receive by non-coherent demodulation. Compared with the OFDM modulation adopted by the conventional WiFi and the coherent demodulation at the receiving end, the reliability of the WUR frame is worse. To ensure high transmission reliability, the transmission of WUR frames per bit should take longer, that is, the symbol length per bit is larger. For example, it has been suggested in the literature that the symbol length of a WUR frame is 4 us, that is, one symbol is transmitted every 4 us. It is estimated that the transmission duration of a WUR frame may require hundreds of us. On the other hand, since the function of the WUR frame is relatively simple, its MAC portion is usually short, and may be only a few bytes or a dozen bytes, which causes the Wake-up Preamble to occupy a larger portion in the entire WUR frame. Especially when the MAC part allows higher rate transmission, the Wake-up Preamble can only use the lowest rate, and the Wake-up Preamble transmission time accounts for a larger proportion of the entire frame transmission time. In short, the long Wake-up Preamble will cause a waste of larger media resources. "Media" here refers to a wireless channel.

Based on the assumption of the Wake-up Preamble structure, the embodiment of the present invention proposes a method for reducing the length of the Wake-up Preamble, which can shorten the WUR frame length as much as possible, thereby reducing waste of media resources and improving media utilization efficiency.

The preamble of the two frame formats supported by 802.11b is shown in Figure 5. The long format shown in (a) of FIG. 5 is actually a format supported by the original 802.11 standard earlier than 802.11b, 802.11 is compatible with this format, and the SYNC part is 128 bits of all 1 sequence; FIG. 5(b) The short format is a newly introduced format of 802.11b, and its SYNC part is a 56-bit all-one sequence. It can be seen that the technological evolution shortens the synchronization signal length. Regardless of 802.11b or original 802.11, the SYNC portion of the preamble of the supported frame format is always fixed length. This length is determined by the most conservative case, which means that in many cases, such a length of SYNC signal is unnecessary, resulting in a waste of resources.

FIG. 6 shows a schematic flow chart of a method of signal processing according to an embodiment of the present application.

601. The second device sends a first message to the first device.

In the embodiment of the present application, the first device includes a main communication module, the second device includes a main communication module and a WUR module, or the first device may further include a WUR module. The first device is a device that sends a wake-up radio frame, and the second device is a device that receives a wake-up radio frame.

For example, the first device may be an AP (such as a router), the second device may be an STA (such as a mobile phone); or the first device may be an STA (such as a mobile phone), and the second device may be a wearable device, such as a wristband. The first device and the second device may also be other devices having the corresponding functions described above, but the application is not limited thereto.

The first device may receive the first message through the primary communication interface or the WUR interface. The synchronization signal is composed of a plurality of repeated signal waveforms, wherein the duration of the synchronization signal may be represented by the time domain length of the synchronization signal, or may be represented by the number of repeated signal waveforms included in the synchronization signal waveform. It may be the bit length of the synchronization sequence corresponding to the synchronization signal, which is not limited in this application.

In some scenarios, two devices may have WUR transceiving capabilities at the same time, and the roles of the two devices depend on the current communication scenario. For example, mobile phones and wristbands, both of which may have WUR transceiving capabilities, and have power-saving requirements, so they can run in WUR mode at the same time, but need to inform the other party's own wake-up window. Specifically, when the mobile phone has data to send to the wristband, the wake-up packet is sent to the wristband in the wake-up window of the wristband. At this time, the mobile phone is the first device, and the wristband is the second device; when the wristband has data to When the mobile phone sends, the wake-up packet is sent to the mobile phone in the wake-up window of the mobile phone. At this time, the wristband is the first device, and the mobile phone is the second device.

It should be understood that, in the embodiment of the present application, the WUR module may be represented by the first interface, and the second interface represents the main communication module, and the embodiment of the present application may also not distinguish between the WUR module or the WUR interface, and the main communication module and the main communication interface. No distinction is made.

Optionally, as an embodiment, the second device determines a desired duration of the synchronization signal, where the second device sends the first device to the first device. Sending the first message includes: sending, by the second device, the first message that carries the synchronization signal for a desired duration to the first device.

As shown in FIG. 7, the second device determines the duration (indicated as the desired duration) of the synchronization signal required to complete synchronization with the first device, which may be determined based on the capabilities of its own first interface (ie, the WUR module). The duration of the sync signal is reported to the first device. The receiving capability of the WUR module itself is usually determined when the device is shipped from the factory, so it can be reported to the first device as a basic capability information. Or the second device may determine the duration of the synchronization signal that is expected by the second device according to other information, which is not limited in this application.

For example, the first message may be an Association Request/Response frame, where the duration of the desired synchronization signal is included, that is, the second device may report the length of the synchronization signal expected by the WUR module in the association process. . At this time, the first message is transmitted through the second interface (ie, the main communication module).

The second device sends a first message carrying the desired duration to the first device, where the first message may be a management frame, a data frame, or a control frame. For example, as shown in FIG. 8, a first message is a management frame, the management frame comprises a sync signal element (Information Element, IE) carrying a synchronization signal for a predetermined length of specifically defined (length L ₀ is assumed desired) a. The first message is a control frame, carrying L ₀ in the control domain of these frames by piggyback, using high throughput (HT)/very high throughput in 802.11n/ac/ax data frames. (Very High Throughput, VHT)/High Efficiency (HE) Control (Control) domain or Quality of Service (QoS) Control domain, or Frame control field of control frame, etc., to carry the second device The desired sync signal length L ₀ . As shown in FIG. 9, the reserved bits in the Frame Control field using control frames (such as Request to Send (RTS)/Clear to Send (CTS)/Acknowledge (ACK), etc. carry L ₀ Where the bit with a value of 0 is a reserved bit and can be used to carry L ₀ .

Optionally, as an embodiment, the target duration of the synchronization signal in the second message may be divided into several files, where the identifier of the synchronization signal target duration used by the second device when the second device is expected to be sent by the second device may be indicated in the first message. . For example, the target duration of the synchronization signal in the second message may be 8 bits, 16 bits, 24 bits, and 32 bits, and the identifiers may be 0, 1, 2, and 3, respectively, and the second message may be used to indicate the second device in the first message. The identifier of the synchronization signal target duration used by the desired first device when transmitting the second message. If the target duration of the synchronization signal in the second message is only two files, for example, 8 bits and 16 bits, the first message can be indicated by only 1 bit. For example, 0 means 8 bits and 1 means 16 bits. In the above description, the target duration of the synchronization signal in the second message is represented by the sequence bit length of the synchronization signal. Equivalently, the target duration of the synchronization signal in the second message may also be represented by the time domain length of the synchronization signal, for example, 32 μs, 64μs and so on. The target duration of the synchronization signal in the second message in all embodiments of the present invention may be represented by the sequence bit length of the synchronization signal, or may be replaced by the time domain length of the synchronization signal, which is equivalent between the two.

Optionally, before the first device receives the first message sent by the second device, the first device sends a third message for measuring channel quality of the third channel to the second device, where the second device determines, according to the third message, The channel quality measurement result of the third channel, and determining the expected duration of the synchronization signal according to the channel quality measurement result of the third channel.

It should be noted that, in the embodiment of the present application, the channel used by the second device to send the first message is referred to as a “first channel”, and the first device sends a third message to the second device. The channel is called the "third channel." The first channel and the third channel may be the same or different.

The third message may be sent through the first interface or the second interface, and the third message may be a WUR frame, that is, the first device sends a WUR frame, and the second device measures the third channel based on the WUR frame. That is, before the second device sends the first message through the second interface, the first device may send a third message to the second device, where the third message is used to measure the direction of the first device to the second device in the third channel. a channel quality (which may be represented as a first direction), the second device determining a channel quality measurement result of the third channel according to the third message, and estimating a length of the synchronization signal that is desired by the channel quality measurement result (represented as an expectation The duration is reported to the first device by the first message.

The channel quality measurement result may be channel quality information (CQI), channel state information (CSI), or signal-to-noise ratio (SNR).

Optionally, as shown in FIG. 10, the first device sends a third message for measuring channel quality of the third channel to the second device, where the second device determines the third channel according to the third message. The channel quality measurement result is carried in the first message and sent to the first device.

Specifically, the channel quality measurement result may also be CQI, CSI, SNR, or the like. Specifically, the first message carrying the channel quality measurement result may be a management frame (as shown in FIG. 8). The third message may be a dedicated channel measurement message, such as a Null Data Packet (NDP) channel sounding message (Sounding). At this time, the first device should also send a measurement notification message before the third message is sent to notify the second device of which channels to measure, as shown in FIG. 11 (the subsequent third message is omitted in the figure), and should be noted. A possible measurement notification message located before the third message is not shown in FIG. The method has high flexibility, and can be used even if the main channel of the main communication module is completely different from the WUR channel. For example, the main channel of the main communication module is channel 1, the WUR channel is in channel 2, and the two channels have no overlap. A device may send measurement notification information in channel 1, instructing the second device to subsequently receive NDP Sounding on channel 2 to perform measurement on channel 2; the third message may also be other messages sent by the primary communication module, such as periodically transmitting Beacon frame, the advantage of this method is that there is no need to send a special measurement message, so the overhead is small.

The embodiment of the present application may refer to the channel quality measurement result of determining the first direction of the third channel by using the third message as “explicit feedback”, and the “explicit feedback” has the advantage of having higher accuracy. The second device feeds back the channel quality measurement result in the first message, and the channel quality measurement result at least includes the measurement result of the channel (represented as the second channel) used for transmitting the second message. Of course, the measurement result of the entire channel (ie, the first channel) may be further included.

Optionally, as an embodiment, the channel quality measurement result may be equivalently represented by a modulation coding scheme (MCS) recommended by the second device, that is, the second device recommends one in the first message. The MCS has a corresponding relationship between the MCS and the channel quality, so that the first device can roughly estimate the approximate channel condition from the first device to the second device according to the MCS recommended by the second device.

For example, in the current 802.11 standard, the second device can piggyback the recommended MCS in the HT Control field of the data frame, and the first device can estimate the preset length by using the recommended MCS, so that no special measurement process is needed. Measuring the channel further reduces overhead.

Optionally, as an embodiment, in a case where the target duration of the synchronization signal is only divided into two files in the second message, the design of the first message may be more simplified. For example, the target duration of the synchronization signal in the second message may be only 8 bits and 16 bits. The first message sent by the second device to the first device may be without any channel quality measurement result and the desired synchronization signal length. _0, etc., and only need to indicate that the first message is a synchronization signal target duration switch message (can be indicated by frame type, indicator bit or other means). Each time the first device receives a first message from the second device, the synchronization signal target duration used to transmit the second message to the second device is switched. The synchronization signal target duration used by the first device to send the second message remains unchanged until the new first message is received. For example, if the first device originally uses 8 bits as the synchronization signal target duration of the second message, after receiving the first message, the first device switches the synchronization signal target duration of the second message of the second device to 16 bits. And before receiving the next first message from the second device, the synchronization signal target duration in the second message sent by the first device to the second device is always 16 bits; when the first device receives the first During the first message of the second device, the synchronization signal target duration in the second message sent by the first device to the second device is switched to 8 bits. The device identifier of the second device should obviously be carried in the first message, so that the first device identifies which device the first message came from.

There may be different schemes when the second device sends the first message. In the first solution, the second device may reuse an Association Request/Association Response frame or a Reassociation Request/Reassociation Response frame as the first message. The situation obviously occurs when the second device and the first device The stage of association/re-association. In the second solution, the second device may send the first message by the way in the second interface communication with the first device, for example, the second device piggybacks the recommended in the HT Control field in the data frame. The MCS, or the data frame sent by the second device as the first message, causes the first device to measure the channel based on this. This occurs when the second interface of the second device is active and is in data interaction with the first device. In the third solution, when the second device considers that the target device needs to modify the target duration of the synchronization signal of the second message, the second device may send a special management frame or a control frame or an NDP frame as the first message, and The first device is sent through the second interface. All of the above three schemes are used when the second interface is in an active state.

However, in many cases, the second device may be in a state in which the second interface is closed and the first interface is turned on. If the second device moves in this state and the channel quality changes, the first device should also be enabled. Know the change of the channel status in time, and then change the target duration of the synchronization signal. In the fourth solution, the second device in the foregoing state may periodically send the first message, where the first message may be sent through the first interface (if the first interface has the sending capability), or The two interfaces are sent. For the latter, the second interface of the second device needs to be periodically activated to send the first message. In the fifth solution, the second device may receive the third message sent by the first device by using the first interface, for example, the third message may be a wake-up frame sent by the first device to the other device by using the first interface, or the third The message may be a WUR Beacon frame sent by the first device through the first interface, and the second device may measure the received power of the third message to estimate the channel. When the second device finds that the channel state changes greatly, the second device sends the first message by using the first interface, or the second device activates the second interface to send the first message. For example, when the second device finds that the MCS that can be recommended to the first device is changed from MCS1 to MCS0 according to the measurement of the third message, the second interface is activated to send the first message to the first device. The first message in the fourth solution and the fifth solution may be any one of the foregoing first messages, such as an NDP frame, a first message carrying a target duration identifier, a first message carrying L ₀ , or carrying a channel quality measurement result. The first news and so on. For the fifth solution, the second device may determine whether to send the first message and the specific content of the recommended content in the first message according to the SNR (Signal-Noise Ratio) or the received signal strength of the received third message. Value. Taking the MCS of the recommended second message as an example, when the second device detects that the SNR of the third message changes from SNR>Thr to SNR<Thr, the second device sends the first message and indicates MCS0. When the second device detects that the SNR of the third message changes from SNR<Thr to SNR>Thr, the second device sends the first message and indicates MCS1. In order to prevent the second device from moving back and forth, causing the second device to frequently switch between the two states, thereby causing the second device to frequently send the first message, causing an increase in transmission overhead and an increase in power consumption, a method of introducing a viscosity coefficient (Δ) may be introduced. . For example, rule 1 is that MCS0 is indicated in the first message when the SNR value detected by the second device is changed from SNR>Thr-Δ to SNR<Thr-Δ. For another example, rule 2 is that when the second device detects that the SNR value changes from SNR<Thr+Δ to SNR>Thr+Δ, MCS1 is indicated in the first message. Δ may be a standard predefined value, or a value assigned by the first device to the second device. The same is true for Thr. Where Δ>0. It should be noted that Rule 1 and Rule 2 are independent of each other and are not required to be used at the same time. Considering that a longer synchronization signal can be used in the case where the second device is closer to the first device, and a shorter synchronization signal cannot be used in the case where the second device is farther away from the first device, a more reasonable rule is : when the SNR value detected by the second device changes from SNR>Thr to SNR<Thr, MCS0 is indicated in the first message; when the SNR value detected by the second device is changed from SNR<Thr+Δ to SNR>Thr When +Δ, MCS1 is indicated in the first message. The replacement of the SNR in the above discussion with the received signal strength is also similar and will not be described again. The above rules apply to the case where the target duration of any two-stage second message synchronization signal is switched.

When the second interface of the second device is in an active state, one or more of the first, second, and third solutions may be adopted. When the second device is in a state in which the second interface is closed and the first interface is turned on, one or more of the fourth and fifth solutions may be adopted.

There may be multiple second devices associated with the first device. The first device should save the second message synchronization signal target duration of each second device. When the first device receives a first message from the second device again and determines a second message synchronization signal target duration different from the saved value according to the first message, the first device may save the second The second message synchronization signal corresponding to the device has a longer target time. The new second is the re-determined second message sync signal target duration. When the first device sends the second message to the second device, the saved second message synchronization signal target duration is always used.

602. The first device determines, according to the first message, a target duration of the synchronization signal.

Optionally, if the first message carries the expected duration of the synchronization signal, the first device determines the target duration according to the expected duration.

After the first device receives the expected duration (represented as L ₀ ) transmitted by the second device through the second interface or the first interface, the target duration of the synchronization signal (denoted as L) is determined according to L ₀ . L is not less than L ₀ , and preferably L = L ₀ . As shown in FIG. 7, the second message omits the Legacy Preamble that may exist, and the following figures all adopt a similar manner, but the application is not limited thereto.

Optionally, the first message carries a channel quality measurement result of the third channel, and the first device determines a target duration of the synchronization signal according to the channel quality measurement result.

Before the second device sends the first message through the second interface, the first device sends a third message to the second device, so that the second device measures the third channel according to the third message, and obtains a third channel quality measurement result. Subsequently, the second device reports the channel quality measurement result to the first device through the first message. In general, the better the channel quality, the smaller the target duration; the worse the channel quality, the larger the target duration.

Optionally, as an embodiment, the first device receives the first message sent by the second device on the first channel, and the first device may measure channel quality of the first channel according to the first message, and generate The channel quality measurement result of the first channel may further determine a target duration of the synchronization signal according to the channel quality measurement result of the first channel.

According to the channel dissimilarity, it is assumed that the channel quality between the first device and the second device is substantially equivalent in both directions, so the measurement of the first device (represented as the second direction) of the second device to the first device is performed. The result is considered to be a channel quality measurement of the first channel (denoted as the first direction) of the first device to the second device, which may be referred to as "implicit feedback." That is, the first message is sent by the second device as the channel measurement message, and the first device measures the first channel according to the first message and generates a channel quality measurement result, and determines the target duration of the synchronization signal based on the channel quality measurement result. . As shown in FIG. 12, the channel quality measurement result may specifically be Channel Quality Information (CQI) or Channel State Information (CSI). Through "implicit feedback", it is possible to achieve known channel quality without separately transmitting channel measurement information, thereby reducing overhead.

The first message in this embodiment is similar to the third message, and the first message may be a dedicated channel measurement message, such as NDP Sounding, or other frames, such as a data frame, a management frame, or a control frame. The first device measures the channel based on the first message. Similarly, the first message can be sent through the first interface (WUR) or through the second interface. Considering that the second device often does not have the WUR transmission capability, it is preferred to send the first message through the second interface.

Optionally, the method further includes: receiving, by the first device, the receiving capability information sent by the second device, where the receiving capability information indicates that the second device receives the receiving capability of the second message, where the first device is configured according to the channel The quality measurement result determines that the target duration of the synchronization signal includes: the first device determines a target duration of the synchronization signal according to the channel quality measurement result and the reception capability information.

When the second device determines L ₀ based on the channel quality measurement result, or when the first device determines L based on the channel quality measurement result fed back by the second device, it may be necessary to consider the receiving capability information of the second device that receives the second message. (The second device receives the receiving capability information of the wake-up radio frame.) In the embodiment of the present application, the “wake-up radio frame” is expressed as “second message”. The "receiving capability" herein may be the receiving capability of the second device to receive the same type of second message (such as the same frame format) or a different type of second message (such as different frame formats).

For example, if the synchronization signal length determined by the first device based on the channel quality measurement result is L ₁ and the synchronization signal length determined based on the WUR reception capability information of the second device is L ₂ , the finally determined L ₀ or L should be taken as the two. The larger one, max{L ₁ , L ₂ }.

Since the synchronization signal length of the WUR frame mainly affects the reception performance of the second device, and the WUR frame is transmitted by the first device and received by the second device, the self-receiving capability and the first device to the second device fed back by the second device Measurement results of channels between devices, for The first device determines the synchronization signal length of the WUR frame to be the most direct and accurate.

Optionally, if the second message is a unicast frame, that is, there is only one second device, the first device determines a synchronization signal length L according to the first message sent by the second device; if the second message is a multicast frame Or broadcast a frame, that is to say there are multiple second devices, then it is necessary to consider the first message fed back by each of the plurality of second devices. Specifically, if the receiving object of the second message is a plurality of known determining devices (for example, the first device is an AP and the second device is a plurality of STAs associated with the AP), the synchronization signal length of the second message is L. It should be considered according to the most conservative one of the plurality of second devices. For example, the L determined by the AP based on the first message sent by each of the three STAs is 30, 35, and 27 respectively (unit: number of repeated waveforms), and the AP sends the first The synchronization signal length of the two messages should be the maximum value of 35 of the three; if the receiving object of the first device is ambiguous (for example, the first device is an AP, and the second device includes both the associated STA and the non-associated STA, the latter does not The first message will be sent as the AP, and the synchronization signal length L of the second message should be the maximum allowed value of the length of the synchronization signal, that is, in the most conservative case.

In addition, the first device determines the target duration according to the channel quality, and specifically may determine the target duration according to the distance between the first device and the second device, and the transmit power, etc., thereby reducing the probability that the STA at a remote location receives the WUR frame. Therefore, the security of the second message transmission is improved, and the application to the wearable device is of great significance.

603. The first device generates a second message according to the target duration of the synchronization signal, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration.

The first device determines the target duration of the synchronization signal, and then generates a wake-up radio frame (represented as the second message) according to the frame format of the system. For example, the wake-up radio frame may include a synchronization signal, a starting frame delimiter (SFD). And/or signaling domains, etc. The first device may generate a wake-up radio frame in different formats for different systems, as long as the synchronization signal is included in the application. The format of the wake-up radio frame is not limited in this application.

The length of the shortest synchronization signal required to receive the WUR frame by the WUR interface of the different second device may be different. This is due to several reasons:

1. The capabilities of the receivers of different devices vary. For example, the WUR of a mobile phone has higher accuracy and reception performance, and requires a shorter synchronization signal to successfully complete synchronization; sensors (for example, sensors for forest monitoring) must be inexpensive because of the need for large-scale deployment, and accordingly, The configured WUR is less accurate and requires a longer sync signal to complete the synchronization.

2. The longer the same device is used, the lower the accuracy due to aging of the device, and the longer synchronization signal is required to complete the synchronization. For example, sensor devices are expected to work for 5-10 years, such a long period of time, coupled with possible harsh environments (for example, sensors in the forest monitoring receive wind, rain and sun), the device ages significantly.

3. With the development and advancement of technology, the synchronization function can be completed with a shorter synchronization signal. For example, from the original 802.11 to 802.11b, the sync signal length becomes shorter.

4. The effect of distance and transmit power. The shorter the distance between the first device and the second device is, the larger the transmission power of the first device is, the smaller the synchronization signal length required for the second device to complete synchronization; conversely, the larger the distance and the smaller the transmission power, the second device is completed. The longer the sync signal required for synchronization.

Among the above four factors, the capability of the receiver itself is determined when the device leaves the factory. The reduction of the synchronization signal length caused by technological advancement is also determined when the device leaves the factory, so it can be collectively reduced to the receiver's own capability (Capability); The change in the length of the synchronization signal caused by the aging, the distance, and the change in the transmission power can be attributed to the influence of the channel between the first device and the second device.

On the other hand, changes in the length of the sync signal do not cause an increase in the complexity of the receiver implementation. The receiver does not detect a predefined number of synchronization signals from the received signal. The repetitive waveform is considered to be the start of the frame, but first detects the predefined repetitive waveform, after synchronizing based on the detection of the predefined repetitive waveform, A signal that detects a predefined sequence (ie, SFD) is considered to be the start of the frame. In other words, when the receiver synchronizes based on the synchronization signal, the number of repetitive waveforms is not counted, and the start position of the frame is determined by the subsequent SFD. Decide. The change in the length of the sync signal is due to the change in the number of repetitive waveforms contained therein. As long as the second device is sufficiently synchronized, the change in the length of the sync signal has no effect on the implementation of the second device.

Obviously, the worse the channel quality, the longer the target duration of the synchronization signal in the second message; the better the channel quality, the shorter the target duration of the synchronization signal in the second message. At the same time, the MCS of the MAC part of the second message can also be adjusted accordingly. For example, the worse the channel quality, the lower the MCS of the MAC portion of the second message can be; the better the channel quality, the higher the MCS of the MAC portion of the second message can be. Further, in the second message, the MCS of the MAC portion can be indicated by the length of the synchronization sequence. For example, when the synchronization sequence length is 8 bits in the second message, the MCS of the MAC part is MCS1; when the synchronization sequence length is 32 bits in the second message, the MCS of the MAC part is MCS0.

604. The first device sends a second message to the second device.

Optionally, the first device sends the second message to the second device by using the first interface, where the channel used by the first device to send the third message to the second device (represented as the third channel) should be able to cover the subsequent transmission. The channel used by the message (for convenience of description, hereinafter referred to as "second channel"). In other words, the second channel used for transmitting the second message may be the third channel, or may be at least one subchannel of the third channel, that is, the second channel may be all subchannels or partial parts of the third channel. channel. For example, the third message is transmitted on a 20 MHz channel and the second message is transmitted on a 4 MHz channel in the 20 MHz channel.

Or the second channel used by the first device to send the second message to the second device may be the first channel used by the second device to send the first message to the first device, or the subchannel of the first channel.

It should be understood that the third channel used by the first device to send the third message to the second device may be the same as the first channel used by the second device to send the first message to the first device, or may be different. Limited.

605. The second device synchronizes with the first device according to the synchronization signal in the second message.

The first device in the embodiment of the present application determines the target duration of the synchronization signal and generates a second message by receiving the first message sent by the second device, and then sends the second message to the second device, so that the second device and the first device Synchronization is performed, so that the second message sent by the first device to the second device has a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing media resource waste and improving media utilization efficiency.

It should be understood that when there are multiple second devices in the network, the synchronization signals of the second message sent by the first device to different second devices may be different, but the selected synchronization signal length L must be relatively short but sufficient to support The receiving end completes the synchronization.

It should also be understood that in various embodiments of the present invention, 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 implemented by the present invention. The implementation of the examples constitutes any limitation.

Therefore, the method for signal processing in the embodiment of the present application receives the first message sent by the second device, determines the target duration of the synchronization signal according to the first message, and generates a second message, and sends the second device to the second device. a second message synchronized with the first device, so that the first device can determine a target duration of the appropriate synchronization signal according to the first message sent by the second device, and send a second message including the target duration of the synchronization signal to the second device. Therefore, the waste of transmitting the second message including the redundant synchronization signal duration to the channel resource is avoided, and the channel resource utilization is improved.

Figure 13 illustrates an interaction flow diagram of a method of signal processing in accordance with one embodiment of the present application. The meanings of the various terms in the embodiments of the present application are the same as those of the foregoing embodiments.

It should be noted that this is only to help those skilled in the art to better understand the embodiments of the present application, and not to limit the scope of the embodiments of the present application.

1301. The first device receives a first message on a first channel, where the first channel includes at least one subchannel.

1302. The first device determines a channel quality measurement result of the first channel according to the first message.

1303. The first device determines a target duration of the synchronization signal according to the channel quality measurement result of the first channel.

1304. The first device generates a second message according to the target duration. The second message includes the synchronization signal, and the duration of the synchronization signal is the target duration.

1305. The first device sends the second message to the second device on the at least one subchannel in the first channel.

1306. The second device synchronizes with the first device according to the synchronization signal in the second message.

Therefore, in the signal processing method of the embodiment of the present application, the first device receives the first message sent by the second device on the first channel, determines a channel quality measurement result of the first channel according to the first message, and according to the first channel The channel quality measurement result determines a target duration of the synchronization signal to generate a second message, and the second channel of the first channel transmits a second message for the second device to synchronize with the first device, so that the first device can Determining, by using the first message as a measurement message, a channel quality measurement result, determining a target duration of the appropriate synchronization signal according to the channel quality measurement result, and transmitting a second message including a target duration of the synchronization signal to the second device, thereby avoiding sending The waste of channel resources caused by the second message including the redundant synchronization signal duration improves the channel resource utilization.

FIG. 14 shows an interaction flowchart of a method of signal processing according to another embodiment of the present application. The meanings of the various terms in the embodiments of the present application are the same as those of the foregoing embodiments.

1401. The first device sends a third message on the third channel, where the third channel includes at least one subchannel.

1402. The second device measures a channel quality measurement result of the third channel according to the third message.

1403. The second device determines a preset length of the synchronization signal according to the channel quality measurement result of the third channel.

1404. The second device sends a first message that carries a desired duration.

1405. The first device determines the target duration according to the expected duration.

1406. The first device generates a second message according to the target duration, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration.

1407. The first device sends the second message to the second device on the subchannel of the third channel.

1408. The second device synchronizes with the first device according to the synchronization signal in the second message.

Therefore, in the signal processing method of the embodiment of the present application, the first device sends a third message that performs channel measurement on the third channel to the second device, so that the second device determines the channel quality of the third channel according to the third message. Measuring, and determining, according to the channel quality measurement result, a desired duration of the synchronization signal required by the second device, the second device sending, to the first device, a first message carrying the expected duration of the synchronization signal, where the first device is configured according to the synchronization signal Determining the target duration of the synchronization signal and generating the second message, the first device transmitting a second message for the second device to synchronize with the first device, so that the first device can be synchronized according to the second device The expected duration of the signal determines a target duration of the appropriate synchronization signal, and transmits a second message including the target duration of the synchronization signal to the second device, thereby avoiding the transmission of the second message including the redundant synchronization signal duration to the channel resource Waste, improve channel resource utilization.

15 shows an interaction flow diagram of a method of signal processing in accordance with another embodiment of the present application. The meanings of the various terms in the embodiments of the present application are the same as those of the foregoing embodiments.

1501. The second device receives a third message sent by the first device on the third channel, where the third message is used to measure channel quality of the third channel, where the third channel includes at least one subchannel.

1502. The second device determines, according to the third message, a channel quality measurement result of the third channel.

1503. The second device sends a first message that carries a channel quality measurement result to the first device.

1504. The first device determines a target duration according to the channel quality measurement result.

1505. The first device generates a second message according to the target duration. The second message includes the synchronization signal, and the duration of the synchronization signal is the target duration.

1506. The first device sends the second message to the second device on the subchannel of the third channel.

1507. The second device synchronizes with the first device according to the synchronization signal in the second message.

Therefore, in the signal processing method of the embodiment of the present application, the first device sends a third message that performs channel measurement on the third channel to the second device, so that the second device determines the channel quality of the third channel according to the third message. The second device sends a first message carrying the channel quality measurement result to the first device, and the first device determines a target duration of the synchronization signal according to the channel quality measurement result, and generates a second message, where the first device sends the second message to the second device. Sending a second message for the second device to synchronize with the first device, so that the first device can determine a target duration of the appropriate synchronization signal according to the channel quality measurement result sent by the second device, and send the synchronization signal to the second device. The second message of the target duration, thereby avoiding the waste of channel resources caused by the second message including the redundant synchronization signal duration, and improving channel resource utilization.

It should be understood that, in the various embodiments of the present application, the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application. The implementation process constitutes any limitation.

The method of signal processing according to an embodiment of the present application is described in detail above, and an apparatus for signal processing according to an embodiment of the present application will be described below.

FIG. 16 shows a schematic block diagram of a first device in accordance with an embodiment of the present application. As shown in FIG. 16, the first device 1600 includes:

The receiving module 1610 is configured to receive a first message sent by the second device.

The processing module 1620 is configured to determine, according to the first message received by the receiving module 1610, a target duration of the synchronization signal;

The processing module 1620 is further configured to generate a second message according to the target duration of the synchronization signal determined by the processing module 1620, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration;

The sending module 1630 is configured to send the second message generated by the processing module 1620 to the second device.

Therefore, the first device in the embodiment of the present application determines the target duration of the synchronization signal by generating the first message sent by the second device, and generates a second message, where the second message includes a synchronization signal, and the second message includes The duration of the synchronization signal is the target duration, and the second message is sent to the second device, so that the second device synchronizes with the first device, so that the second message sent by the first device to the second device is relatively short, but Sufficient synchronization signal for the second device to complete the synchronization function, thereby reducing waste of media resources and improving media utilization efficiency.

Optionally, the first message carries a desired duration of the synchronization signal, and the expected duration of the synchronization signal indicates a duration of the synchronization signal required by the second device to complete synchronization with the first device; the processing module 1620 is specifically configured to: And determining, according to the expected duration, a target duration of the synchronization signal, the target duration being not less than the expected duration.

Optionally, the sending module 1630 is further configured to send a third message to the second device on the first channel, so that the second device measures the channel quality of the first channel according to the third message, to generate the first channel. The channel quality measurement result, and determining the expected duration of the synchronization signal according to the channel quality measurement result of the first channel.

Optionally, the receiving module 1610 is further configured to: receive, by the first device, the first message sent by the second device on the first channel; the processing module 1620 is specifically configured to: measure the first channel according to the first message The channel quality is generated and the channel quality measurement result of the first channel is generated; and the target duration of the synchronization signal is determined according to the channel quality measurement result of the first channel.

Optionally, the sending module 1630 is further configured to send a third message to the second device, where the third message is used by the second device to measure channel quality of the first channel and generate the first channel. Channel quality measurement result; the first message carries a channel quality measurement result of the first channel; the processing module 1620 is specifically configured to: determine the synchronization according to the channel quality measurement result of the first channel The target duration of the signal.

Optionally, the receiving module 1610 is further configured to receive the receiving capability information that is sent by the second device, where the receiving capability information indicates that the second device receives the receiving capability of the second message. The processing module 1620 is specifically configured to: according to the first The channel quality measurement result of one channel and the reception capability information determine the target duration of the synchronization signal.

Optionally, the first channel includes at least one subchannel, and the sending module 1630 is specifically configured to send the second message to the second device on the at least one subchannel of the first channel.

A first device according to an embodiment of the present application may correspond to an execution body of a method of signal processing according to an embodiment of the present application, and the above-described and other operations and/or functions of respective modules in the first device are respectively implemented in order to implement the respective methods described above The corresponding process, for the sake of brevity, will not be described here.

FIG. 17 shows a schematic block diagram of a first device in accordance with an embodiment of the present application. As shown in FIG. 17, the second device 1700 includes:

The sending module 1710 is configured to send, to the first device, a first message, where the first message is used by the first device to determine a target duration of the synchronization signal, and generate a second message, where the second message includes the synchronization signal, the synchronization signal The duration of the target;

The receiving module 1720 is configured to receive the second message sent by the first device.

The processing module 1730 is configured to synchronize with the first device according to the synchronization signal in the second message.

Therefore, the second device in the embodiment of the present application sends the first message to the first device, so that the first device determines the target duration of the synchronization signal according to the first message, and generates a second message according to the target duration. The second message includes a synchronization signal, and the duration of the synchronization signal included in the second message is the target duration, and the second message sent by the first device is received, and the second device is configured according to the synchronization signal in the second message and the first device. Synchronization is performed, so that the second message received by the second device is a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing media resource waste and improving media utilization efficiency.

Optionally, the processing module 1730 is further configured to determine a desired duration of the synchronization signal, where a desired duration of the synchronization signal indicates a duration of a synchronization signal required by the second device to complete synchronization with the first device; the sending module 1710 Specifically, the method is: sending, to the first device, the first message that carries the synchronization signal for a desired duration.

Optionally, the receiving module 1720 is further configured to receive, by the second device, a third message, where the third message is used to measure channel quality of the first channel, and the processing module 1730 is further configured to determine the first message according to the third message. The channel quality measurement result of the channel; the processing module 1730 is specifically configured to: determine a desired duration of the synchronization signal according to the channel quality measurement result of the first channel.

Optionally, the receiving module 1720 is further configured to receive a third message, where the third message is used to measure channel quality of the first channel, and the processing module 1730 is further configured to determine, according to the third message, the channel of the first channel. The processing module 1730 is specifically configured to: send the first message that carries the channel quality measurement result of the first channel to the first device.

A second device according to an embodiment of the present application may correspond to an execution subject of a method of signal processing according to an embodiment of the present application, and The foregoing and other operations and/or functions of the respective modules in the two devices are respectively omitted in order to implement the corresponding processes of the foregoing various methods.

FIG. 18 shows a system 1800 for signal processing in accordance with an embodiment of the present application, the system 1800 comprising:

The first device 1600 in the embodiment shown in FIG. 16 and the second device 1700 in the embodiment shown in FIG.

FIG. 19 is a schematic structural diagram of a first device provided by an embodiment of the present application. As shown in FIG. 19, the first device includes at least one processor 1902 (eg, a general purpose processor CPU with computing and processing capabilities, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array ( The FPGA 1702 is configured to manage and schedule modules and devices within the first device. The processing module 1620 in the embodiment shown in FIG. 16 can be implemented by the processor 1902. The first device also includes at least one transceiver 1905 (receiver/transmitter 1905), a memory 1906, and at least one bus system 1903. The receiving module 1610 and the transmitting module 1630 in the embodiment shown in FIG. 16 can be implemented by the transceiver 1905. The various components of the first device are coupled together by a bus system 1903, which may include a data bus, a power bus, a control bus, a status signal bus, etc., but for clarity of description, various buses are labeled as Bus system 1903.

The method disclosed in the above embodiments of the present application may be applied to the processor 1902, or used to execute an executable module, such as a computer program, stored in the memory 1906. The memory 1906 may include a high speed random access memory (RAM), and may also include a non-volatile memory. The memory may include a read only memory and a random access memory, and provides the processor with Required signaling or data, programs, etc. A portion of the memory may also include non-volatile line random access memory (NVRAM). A communication connection with at least one other network element is achieved by at least one transceiver 1905 (which may be wired or wireless).

In some embodiments, the memory 1906 stores a program 19061, and the processor 1902 executes the program 19061 for performing the following operations:

Receiving, by the transceiver 1905, the first message sent by the second device;

Determining a target duration of the synchronization signal according to the first message;

Generating a second message according to the target duration of the synchronization signal, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration;

The second message is sent to the second device by the transceiver 1905.

It should be noted that the first device may be specifically the first device in the embodiment shown in FIG. 16 and may be used to perform the method embodiments in FIG. 6, FIG. 13, FIG. 14 and FIG. Each step and/or process corresponding to a device.

As can be seen from the foregoing technical solution provided by the embodiment of the present application, the first device determines the target duration of the synchronization signal by receiving the first message sent by the second device, and generates a second message, where the second message includes a synchronization signal, and The duration of the synchronization signal included in the second message is the target duration, and the second message is sent to the second device, so that the second device synchronizes with the first device, so that the second device sends the second message to the second device. The synchronization signal has a relatively short but sufficient second device to complete the synchronization function, thereby reducing waste of media resources and improving media utilization efficiency.

FIG. 20 is a schematic structural diagram of a second device provided by an embodiment of the present application. As shown in FIG. 20, the second device includes at least one processor 2002 (eg, a general purpose processor CPU with computation and processing capabilities, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array ( The FPGA 2002 is used to manage and schedule the modules and devices in the second device. The processing module 1730 in the embodiment shown in FIG. 17 can be implemented by the processor 2002. The second device also includes at least one transceiver 2005 (receiver/transmitter 2005), memory 2006, and at least one bus system 2003. The receiving module 1720 and the transmitting module 1710 in the embodiment shown in FIG. 17 can be implemented by the transceiver 2005. The various components of the second device are coupled together by a bus system 2003, which may include a data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as the bus system 2003 in the figure.

The method disclosed in the above embodiments of the present application may be applied to the processor 2002 or used to execute an executable module, such as a computer program, stored in the memory 2006. The memory 2006 may include a high speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory. The memory may include a read only memory and a random access memory, and provides the processor with Required signaling or data, programs, etc. A portion of the memory may also include non-volatile line random access memory (NVRAM). A communication connection with at least one other network element is achieved by at least one transceiver 2005 (which may be wired or wireless).

In some embodiments, the memory 2006 stores the program 20061, and the processor 2002 executes the program 20061 for performing the following operations:

Transmitting, by the transceiver 2005, a first message to the first device, where the first message is used by the first device to determine a target duration of the synchronization signal, and generating a second message, where the second message includes the synchronization signal, and the duration of the synchronization signal The length of time for the target;

Receiving, by the transceiver 2005, the second message sent by the first device;

The second device synchronizes with the first device according to the synchronization signal in the second message.

It should be noted that the second device may be specifically the second device in the embodiment shown in FIG. 17 and may be used to perform the method embodiments in FIG. 6, FIG. 13, FIG. 14 and FIG. The respective steps and/or processes corresponding to the two devices.

It can be seen from the foregoing technical solution provided by the embodiment of the present application that the second device sends the first message to the first device, so that the first device determines the target duration of the synchronization signal according to the first message, and generates the target duration according to the target duration. a second message, the second message includes a synchronization signal, and the duration of the synchronization signal included in the second message is the target duration, and the second message sent by the first device is received, and the second device is configured according to the second message. The synchronization signal is synchronized with the first device, so that the second message received by the second device is a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing media resource waste and improving media utilization efficiency.

The embodiment of the present application further provides a computer storage medium, which can store program instructions for indicating any of the above methods.

Optionally, the storage medium may be specifically a memory 1906 or 2006.

It is to be noted that the priority of the prior application is hereby incorporated by reference. The meanings of the various terms described below are the same as in the previous embodiments.

The embodiment of the present invention solves the problem that the Wake-up Preamble occupies a large size in the WUR frame, and proposes a method for reducing the Wake-up Preamble, which can shorten the WUR frame length as much as possible, thereby reducing waste of media resources and improving media utilization efficiency. .

In an embodiment of the present invention, the first device receives the first message sent by the second device by using the first interface or the second interface, and determines a synchronization signal length L based on the first message; the first device generates a second message, The second message includes a first synchronization signal, and the length of the first synchronization signal is L. The first device sends the second message to the second device by using the first interface. The signaling interaction and processing flow of this embodiment is as shown in FIG. 21.

It should be noted that the "synchronization signal length" herein corresponds to the "target duration of the synchronization signal" in the above embodiment.

In the embodiment of the present invention, the second message sent by the first device to the second device has a synchronization signal that is relatively short but sufficient for the second device to complete the synchronization function, thereby reducing media resource waste and improving media utilization efficiency. When there are multiple second devices in the network, the synchronization signals of the second message sent by the first device to different second devices may be different, but the length L of the selected synchronization signal must be relatively short but sufficient to support the completion of the receiving end. Synchronous.

In an embodiment of the invention, the first interface may be a WUR, and accordingly, the second message may be a WUR frame. The first message may be received by the first interface or the second interface of the first device, and the second interface may be a primary communication interface, that is, a WiFi interface or other high-speed communication interface, such as LTE. If the first device has no WUR receiving capability, or the second device has no WUR sending capability, the first message can only pass the first An interface is transmitted.

The first device is a device that sends a WUR frame, and the second device is a device that receives a WUR frame. For example, the first device may be an AP, such as a router, and the second device may be a STA, such as a mobile phone; the first device may also be a STA, such as a mobile phone, and the second device may be a wearable device, such as a smart phone, a wristband, or the like. In some scenarios, two devices may have WUR transceiving capabilities at the same time, and the roles of the two devices depend on the current communication scenario. For example, mobile phones and wristbands, both of which may have WUR transceiving capabilities, and have power-saving requirements, so they can run in WUR mode at the same time, but need to inform the other party's own wake-up window. Specifically, when the mobile phone has data to send to the wristband, the wake-up packet is sent to the wristband in the wake-up window of the wristband. At this time, the mobile phone is the first device, and the wristband is the second device; when the wristband has data to When the mobile phone sends, the wake-up packet is sent to the mobile phone in the wake-up window of the mobile phone. At this time, the wristband is the first device, and the mobile phone is the second device.

The first synchronization signal is composed of a plurality of repeated signal waveforms. The first synchronization signal length L may be the time domain length of the first synchronization signal, or may be the number of repeated signal waveforms included in the first synchronization signal waveform, or may be the bit of the synchronization sequence corresponding to the first synchronization signal. length. The substantive meanings of the three are the same and are used to describe the duration of the first synchronization signal.

The first message is a feedback message, and the first device determines, according to the feedback message from the second device, the length of the synchronization signal used when the WUR frame (ie, the second message) is subsequently transmitted. The length of the synchronization signal of the WUR frame sent to the second device can vary, mainly for two reasons:

On the one hand, the length of the shortest synchronization signal required to receive the WUR frame by the WUR interface of the different second device may be different. This is due to several reasons:

A. The capabilities of the receivers of different devices vary. For example, the WUR of a mobile phone has higher accuracy and reception performance, and requires a shorter synchronization signal to successfully complete synchronization; sensors (for example, sensors for forest monitoring) must be inexpensive because of the need for large-scale deployment, and accordingly, The configured WUR is less accurate and requires a longer sync signal to complete the synchronization.

B. The longer the same device is used, the lower the accuracy due to aging of the device, and the longer synchronization signal is required to complete the synchronization. For example, sensor devices are expected to work for 5-10 years, such a long period of time, coupled with possible harsh environments (for example, sensors in the forest monitoring receive wind, rain and sun), the device ages significantly.

C. As technology advances and advances, shorter synchronization signals are required to complete the synchronization function. For example, from the original 802.11 to 802.11b, the sync signal length becomes shorter.

D. Influence of distance and transmit power. The shorter the distance between the first device and the second device, the larger the transmission power of the second device to send the second message, the smaller the synchronization signal length required for the second device to complete synchronization; conversely, the larger the distance, the smaller the transmission power. The longer the synchronization signal required for the second device to complete the synchronization.

Among the above four factors, the capability of the receiver itself is determined when the equipment is shipped from the factory. The reduction of the synchronization signal length caused by technological advancement is also determined when the equipment leaves the factory, so it can be attributed to the receiver's own capability (Capability); The change in the length of the synchronization signal caused by the change in distance and transmission power can be attributed to the influence of the channel between the first device and the second device.

On the other hand, changes in the length of the sync signal do not cause an increase in the complexity of the receiver implementation. The receiver does not detect a predefined number of synchronization signals from the received signal. The repetitive waveform is considered to be the start of the frame, but first detects the predefined repetitive waveform, after synchronizing based on the detection of the predefined repetitive waveform, A signal that detects a predefined sequence (ie, SFD) is considered to be the start of the frame. In other words, when the receiver synchronizes based on the synchronization signal, the number of repetitive waveforms is not counted, and the start position determination of the frame is determined by the subsequent SFD. The change of the length of the synchronization signal is due to the change of the number of repetitive waveforms contained therein. As long as the receiving end completes the synchronization, the change of the synchronization signal length has no effect on the implementation of the receiving end.

It should be noted that if the second message is a unicast frame, that is, there is only one second device, the synchronization signal length L of the second message depends only on the first message fed back by the second device; if the second message is more Broadcast frame or broadcast frame, that is, there are multiple second devices, you need to consider more The first message that each of the second devices feeds back. Specifically, if the expected receiving object of the second message is a plurality of known determining devices (for example, the first device is an AP and the second device is a plurality of STAs associated with the AP), the synchronization signal length of the second message L should be considered according to the most conservative one of the plurality of second devices. For example, the L determined by the AP based on the first message sent by each of the three STAs is 30, 35, and 27 respectively (unit: number of repeated waveforms), and the AP transmits The synchronization signal length of the second message should be the maximum value of 35 of the three; if the expected destination of the second message is ambiguous (for example, the first device is an AP, and the second device includes both the associated STA and the non-associated STA, The synchronization signal length L of the second message should be the maximum allowable value of the synchronization signal length, that is, according to the most conservative case.

Embodiment 1: The first message is an explicit feedback message

The second device feeds back the first synchronization signal length L0 that is expected by the first device to the first device, or feeds back the channel state information of the first device to the second device. In this embodiment, the first message is transmitted through a second radio.

Specifically, there are two situations:

1) The second device determines a desired first synchronization signal length L0 based on its own first interface (WUR interface) and reports it to the first device.

The receiving capability of the WUR interface itself is usually determined when the device is shipped from the factory, so it can be reported to the first device as a basic capability information. For example, the first message is an Association Request/Response frame, which includes a desired first synchronization signal length L ₀ , that is, the second device reports the synchronization signal length L ₀ expected by its own WUR receiver during the association process. At this time, the first message is transmitted through the second interface (ie, the main communication interface).

After the first device receives the first message sent by the second device through the second interface, the synchronization signal length L is determined according to the L ₀ reported therein. L is not less than L ₀ , and preferably L = L ₀ . The first device then uses L for the transmission of the second message on the first interface.

The above process is shown in FIG. Note that for ease of illustration, the second message in Figure 7 omits the Legacy Preamble that may be present. The following figures are all in a similar manner and will not be described again. Figure 22 is a signaling interaction and processing flow of the solution.

2) The second device measures the channel, and feeds the channel measurement result or L ₀ determined based on the channel measurement result to the first device by using the first message.

Before the second device sends the first message through the second interface, the first device sends a third message to the second device, so that the second device measures the channel based on the third message, and obtains the channel measurement result. Then, the second device reports the channel measurement result to the first device by using the first message, or the second device estimates the synchronization signal length L ₀ expected by the first interface (WUR interface) of the first device based on the channel measurement result, and passes the first The message is reported to the first device.

In this embodiment, the channel measurement result may specifically be Channel Quality Information (CQI), Channel State Information (CSI), or Signal-Noise Ratio (SNR). In addition, the channel measurement result can also be represented by the recommended MCS, that is, the second device recommends one MCS in the first message, so that the first device uses when sending a message to the second device. Since the MCS generally has a corresponding relationship with the channel quality, the first device may estimate the approximate channel condition from the first device to the second device based on the MCS recommended by the second device, thereby determining the synchronization signal length L ₀ . In the current 802.11 standard, the receiving end can piggyback the recommended MCS in the HT Control field of the data frame to achieve the purpose of MCS feedback. In this embodiment, the recommended MCS can be used to estimate L ₀ , so that no special measurement is needed. The process to measure the channel further reduces overhead.

If the second device reports the expected synchronization signal length L ₀ through the first message, the first device determines the synchronization signal length L according to L ₀ , as shown in FIG. 10 , and its signaling interaction and processing flow is as shown in FIG. 23 . L is not less than L ₀ , and preferably L = L ₀ .

If the second device reports the channel measurement result by using the first message, the first device determines the synchronization signal length L based on the channel measurement result. As shown in FIG. 11, the signaling interaction and processing flow is as shown in FIG. In general, the better the channel quality, the smaller the L; the worse the channel quality, the larger L. The first device then uses L for the transmission of the second message on the first interface.

The third message may be sent through the first interface, that is, the first device sends a WUR frame, and the second device measures the channel based on the WUR frame.

The third message may also be sent through the second interface. At this time, the channel used to send the third message (referred to as the first channel) should be able to cover the channel used for the subsequent transmission of the second message (referred to as the second channel), that is, the first The two channels are subchannels of the first channel. For example, the third message is transmitted on a 20 MHz channel and the second message is transmitted on a 4 MHz channel in the 20 MHz channel. If the second device feeds back the channel measurement result in the first message, the channel measurement result at least includes the measurement result of the channel used for transmitting the second message (for example, the foregoing 4 MHz channel). Of course, the measurement result of the entire channel (for example, the aforementioned 20 MHz channel) may be further included.

The third message may be a dedicated channel measurement message, such as NDP Sounding. At this time, the first device should send a measurement notification message before sending the third message to notify which STAs to measure which channels, as shown in FIG. 11 ( The transmission of the subsequent third message is omitted in the figure. Note that the possible measurement notification messages located before the third message are not shown in FIGS. 10 and 23. The method has high flexibility, and can be used even if the main channel of the main radio and the WUR channel are completely different. For example, the main radio main channel is channel 1, the WUR channel is in channel 2, and the two channels have no overlap, then the first device can Sending measurement notification information in channel 1, instructing the second device to subsequently receive NDP Sounding on channel 2 to perform measurement on channel 2; the third message may also be other messages sent by main radio, such as periodically transmitting Beacon frames, The advantage of this method is that there is no need to send a special measurement message, so the overhead is small, but since the main radio transmission must use the primary channel, if the WUR channel does not overlap with the main radio primary channel, the method may be difficult to use.

When the second device feeds back the channel measurement result through the first message, the first message should be a management frame, where the channel measurement result is carried. For the case where the second device feeds back the expected synchronization signal length L ₀ by using the first message in the embodiment, the first message may also be a management frame, which includes a specially defined information element for carrying the synchronization signal length L ₀ ( Information Element (IE), such as the synchronization signal IE shown in FIG. 8; the first message may also be a data frame or a control frame, carrying L ₀ in the control domain of these frames by piggyback, for example, using 802.11 The HT/VHT/HE Control field or the QoS Control field in the n/ac/ax data frame, or the Frame Control field of the control frame, etc., carries the synchronization signal length L ₀ expected by the second device. 9 is an example of a reserved bit carrying L _{0 in} a Frame Control field using a control frame (eg, RTS/CTS/ACK, etc.), where a bit having a value of 0 is a reserved bit and can be used to carry L ₀ .

It should be noted that whether the second device determines L ₀ based on the channel measurement result or when the first device determines L based on the channel measurement result fed back by the second device, it may be necessary to consider the WUR receiving capability of the second device. For example, if the synchronization signal length determined based on the channel measurement result is L ₁ and the synchronization signal length determined based on the WUR reception capability of the second device is L ₂ , then the finally determined L ₀ or L should take the larger of the two. That is, max{L ₁ , L ₂ }.

The advantage of explicit feedback is that it has higher accuracy. Since the synchronization signal length of the WUR frame mainly affects the receiving performance of the receiving end, and the WUR frame is sent by the first device and received by the second device, the self-receiving capability fed back by the second device and the first device to the second device are The measurement result of the inter-channel is the most direct and accurate for determining the synchronization signal length of the WUR frame by the first device. The main disadvantage of this embodiment is that the overhead of the measurement and feedback process is slightly larger.

Embodiment 2: The first message is an implicit feedback message

Implicit feedback, that is, according to channel reciprocity, assuming that the channel quality between the first device and the second device is substantially equal in both directions, the measurement result of the channel from the second device to the first device is regarded as The channel measurement result from the first device to the second device. At this time, the channel measurement message (ie, the first message) is sent by the second device, and the first device measures the channel based on the channel, and estimates the synchronization signal length L based on the channel measurement result. As shown in Figure 12. The channel measurement result may specifically be a letter CQI or a CSI or the like. FIG. 25 is a signaling interaction and processing flow of the embodiment.

The first message in this embodiment is similar to the third message in the first embodiment, and the receiving end performs measurement on the channel based on the message. Similarly, the first message may be sent through the first interface (WUR) or through the second interface (main radio). Considering that the second device often does not have the WUR transmission capability, it is preferred to send the first message through the second interface. At this time, the first message sent on the second interface The channel used (referred to as the third channel) should be able to cover the channel (referred to as the second channel) used for subsequent transmission of the second message, that is, the second channel is a subchannel of the third channel. For example, the first message is transmitted on a 20 MHz channel and the second message is transmitted on a 4 MHz channel in the 20 MHz channel. The first message may be a dedicated channel measurement message, such as NDP Sounding; or may be another frame, such as a data frame, a management frame, or a control frame sent by the second device to the first device.

Similar to the first embodiment, it should be noted that when the first device determines L based on the channel measurement result obtained by measuring the first message, it may be necessary to consider the WUR receiving capability of the second device, and the receiving capability of the second device may be It is feedback in advance, such as using the Association Request/Response frame in the association process to feed back.

For example, if the synchronization signal length determined based on the channel measurement result is L ₁ and the synchronization signal length determined based on the WUR reception capability of the second device is L ₂ , then the finally determined L ₀ or L should take the larger of the two. That is, max{L ₁ , L ₂ }.

The advantage of implicit feedback is that the overhead is small, only one channel measurement message can be used; the disadvantage is that the channel quality equivalent forward channel (the first device to the first channel) using the reverse channel (the channel of the second device to the first device) The channel quality of the channel of the two devices may not be accurate enough in some cases, which may affect the accuracy of the L determined by the first device, thereby affecting the performance of the second device receiving the second message.

Embodiment 3

The embodiment of the present invention provides a first device, which may be used in the foregoing embodiment to perform various steps and/or processes corresponding to the first device in the foregoing method embodiment. The specific structure may be the structure of the first device as shown in FIG. 26, wherein the module 300 corresponds to the first device. For the first device 300, it includes sub-modules 301, 302, 303, 304, and 305. The first device receives the first message sent by the second device by using the first interface 301 or the second interface 302, and determines a synchronization sequence length L based on the first message in the processor 303; the processor 303 generates a second message, the second message The first synchronization signal is included, and the length of the first synchronization signal is L. The first device sends the second message to the second device through the first interface 301. In FIG. 26, the submodule 301 corresponds to the first interface and can be provided by the WUR. The sub-module 302 corresponding to the second transceiver of the device being awakened, that is, the second interface, may be provided by a main radio (for example, 802.11 main radio). The sub-module 303 corresponds to the processor (which may be one or more), and may implement the foregoing function of determining L according to the first message and generating the second message, that is, the determining unit and the generating unit in claim 7 may be implemented by the processor 303. Sub-module 304 corresponds to a memory (which may be one or more). Sub-module 303 and sub-module 304 can be shared by the first interface and the second interface.

In the example shown in FIG. 26, the first interface 301 and the second interface 302 can share the same antenna sub-module 305, mainly for reducing equipment hardware cost and implementing simple considerations. The first interface 301 and the second interface 302 may also correspond to different antennas, especially when the two work on different frequency bands, for example, the two work in the 2.4 GHz band and the 5 GHz band, respectively. In the actual product, the first device 300 can be implemented by a System on a Chip (SoC) or an integrated circuit.

The embodiment of the present application can shorten the WUR frame length, so that the WUR sent by the AP to each user has the shortest synchronization signal, thereby reducing waste and improving system efficiency; and adjusting the synchronization sequence length according to the distance and the transmission power, and reducing the distance farther. The probability that the three-party STA receives the WUR frame improves the security of the WUR transmission, which is particularly meaningful for wearable devices.

It should be understood that the specific examples in the present application are only intended to help those skilled in the art to better understand the embodiments of the present application, and do not limit the scope of the embodiments of the present application.

It should be understood that the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

For the structure of the first device and the second device involved in the embodiments of the present application, reference may be made to the structural diagram shown in FIG. 1 or FIG.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

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 by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. 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 may be Integrate 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, and may be in an electrical, mechanical or other form.

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 purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application 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 application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used 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 application. 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. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of this application is subject to the scope of protection of the claims.

Claims

A method of signal processing, comprising:

Receiving, by the first device, the first message sent by the second device;

Determining, by the first device, a target duration of the synchronization signal according to the first message;

The first device generates a second message according to the target duration, where the second message includes the synchronization signal, and the duration of the synchronization signal is the target duration;

The first device sends the second message to the second device.
The method according to claim 1, wherein said first message carries a desired duration of said synchronization signal, said desired duration representing a synchronization required by said second device to complete synchronization with said first device The length of the signal;

The determining, by the first device, the target duration of the synchronization signal according to the first message includes:

The first device determines the target duration according to the expected duration, and the target duration is greater than or equal to the expected duration.
The method according to claim 2, wherein before the first device receives the first message sent by the second device, the method further includes:

The first device sends a third message to the second device on the first channel, so that the second device measures channel quality of the first channel according to the third message to generate the first channel. Channel quality measurement results, and determining the expected duration based on channel quality measurements of the first channel.
The method according to claim 1, wherein the receiving, by the first device, the first message sent by the second device comprises:

Receiving, by the first device, the first message sent by the second device on a first channel;

The determining, by the first device, the target duration of the synchronization signal according to the first message includes:

Determining, by the first device, a channel quality of the first channel according to the first message, and generating a channel quality measurement result of the first channel;

The first device determines the target duration according to a channel quality measurement result of the first channel.
The method according to claim 1, wherein before the first device receives the first message sent by the second device, the method further includes:

Transmitting, by the first device, a third message to the second device, where the third message is used by the second device to measure channel quality of the first channel and generate a channel of the first channel Quality measurement result;

The first message carries a channel quality measurement result of the first channel;

The determining, by the first device, the target duration of the synchronization signal according to the first message includes:

The first device determines the target duration according to a channel quality measurement result of the first channel.
The method according to claim 4 or 5, wherein before the first device receives the first message sent by the second device, the method further includes:

Receiving, by the first device, the receiving capability information sent by the second device, where the receiving capability information indicates that the second device receives the receiving capability of the second message;

The determining, by the first device, the target duration of the synchronization signal according to the channel quality measurement result of the first channel includes:

The first device determines the target duration according to the channel quality measurement result of the first channel and the receiving capability information.
The method according to any one of claims 3 to 5, wherein the first channel comprises at least one subchannel;

The sending, by the first device, the second message to the second device includes:

The first device sends the second message to the second device on at least one of the first channels.
A method of signal processing, comprising:

The second device sends a first message to the first device, where the first message is used by the first device to determine a target duration of the synchronization signal, and generates a second message, where the second message includes the synchronization signal, The duration of the synchronization signal is the target duration;

Receiving, by the second device, the second message sent by the first device;

The second device synchronizes with the first device according to a synchronization signal in the second message.
The method of claim 8 further comprising:

Determining, by the second device, a desired duration of the synchronization signal, the expected duration representing a duration of the synchronization signal required by the second device to complete synchronization with the first device;

The sending, by the second device, the first message to the first device includes:

Sending, by the second device, the first message that carries the expected duration to the first device.
The method of claim 9 wherein the method further comprises:

The second device receives a third message, where the third message is used to measure channel quality of the first channel;

Determining, by the second device, a channel quality measurement result of the first channel according to the third message;

The determining, by the second device, the expected duration of the synchronization signal includes:

The second device determines the expected duration based on a channel quality measurement result of the first channel.
The method of claim 8 further comprising:

The second device receives a third message, where the third message is used to measure channel quality of the first channel;

Determining, by the second device, a channel quality measurement result of the first channel according to the third message;

The sending, by the second device, the first message to the first device includes:

The second device sends the first message carrying a channel quality measurement result of the first channel to the first device.
A first device, comprising:

a receiving module, configured to receive a first message sent by the second device;

a processing module, configured to determine a target duration of the synchronization signal according to the first message received by the receiving module;

The processing module is further configured to generate a second message according to the target duration determined by the processing module, where the second message includes the synchronization signal, and a duration of the synchronization signal is the target duration;

And a sending module, configured to send, to the second device, the second message generated by the processing module.
The first device according to claim 12, wherein the first message carries a desired duration of the synchronization signal, and the expected duration represents that the second device needs to complete synchronization with the first device. The duration of the synchronization signal;

The processing module is specifically configured to:

Determining the target duration according to the expected duration, the target duration being greater than or equal to the expected duration.
The first device according to claim 13, wherein the sending module is further configured to send a third message to the second device on the first channel, so that the second device is configured according to the third message. Measuring a channel quality of the first channel to generate a channel quality measurement result of the first channel, and determining the expected duration based on a channel quality measurement result of the first channel.
The first device according to claim 12, wherein the receiving module is further configured to: receive, by the first device, the first message sent by the second device on a first channel;

The processing module is specifically configured to:

And measuring, according to the first message, a channel quality of the first channel and generating a channel quality measurement result of the first channel;

Determining the target duration according to the channel quality measurement result of the first channel.
The first device according to claim 12, wherein the sending module is further configured to send a third message to the second device on the first channel, where the third message is used by the second device to measure Channel quality of the first channel and generating the first channel Channel quality measurement results;

The first message carries a channel quality measurement result of the first channel;

The processing module is specifically configured to:

Determining the target duration according to the channel quality measurement result of the first channel.
The first device according to claim 15 or 16, wherein the receiving module is further configured to receive the receiving capability information sent by the second device, where the receiving capability information indicates that the second device receives the second The ability to receive messages;

The processing module is specifically configured to:

Determining the target duration according to the channel quality measurement result of the first channel and the receiving capability information.
The first device according to any one of claims 14 to 16, wherein the first channel comprises at least one subchannel;

The sending module is specifically configured to:

Transmitting the second message to the second device on at least one of the first channels.
A second device, comprising:

a sending module, configured to send a first message to the first device, where the first message is used by the first device to determine a target duration of the synchronization signal, and generate a second message, where the second message includes the synchronization signal, The duration of the synchronization signal is the target duration;

a receiving module, configured to receive the second message sent by the first device;

And a processing module, configured to synchronize with the first device according to the synchronization signal in the second message.
The second device according to claim 19, wherein the processing module is further configured to determine a desired duration of the synchronization signal, the expected duration indicating that the second device completes synchronization with the first device The length of time required for the sync signal;

The sending module is specifically configured to:

Sending the first message carrying the expected duration to the first device.
The second device according to claim 20, wherein the receiving module is further configured to: receive, by the second device, a third message, where the third message is used to measure channel quality of the first channel;

The processing module is further configured to determine, according to the third message, a channel quality measurement result of the first channel;

The processing module is specifically configured to:

Determining the expected duration according to the channel quality measurement result of the first channel.
The second device according to claim 19, wherein the receiving module is further configured to receive a third message, where the third message is used to measure channel quality of the first channel;

The processing module is further configured to determine, according to the third message, a channel quality measurement result of the first channel;

The processing module is specifically configured to:

Transmitting, to the first device, the first message carrying a channel quality measurement result of the first channel.
A method of signal processing, the method comprising:

Receiving, by the first device, the first message sent by the second device by using the first interface or the second interface, where the first device determines the synchronization signal length L based on the first message;

The first device generates a second message, where the second message includes a first synchronization signal, and the length of the first synchronization signal is L;

The first device sends the second message to the second device by using a first interface.
The method of claim 23, wherein the first device passes the first interface before the first device receives the first message sent by the second device by using the first interface or the second interface Or the second interface sends a third message, so that the second device base Measuring, by the third message, a channel, and obtaining a channel measurement result, where the channel used by the first device to send the third message is a first channel, and the first device sends the second message The channel used is a second channel, the second channel is a subchannel of the first channel, and the channel measurement result includes at least a measurement result of the second device to the second channel.
The method of claim 24, wherein the first device receives the first message sent by the second device by using the second interface, and the first device determines the synchronization signal length L based on the first message, including:

The channel information includes the channel measurement result, and the first device determines the synchronization signal length L based on the channel measurement result.
The method of claim 23 or 24, wherein the first device receives the first message sent by the second device by using the second interface, and the first device determines the synchronization signal length L based on the first message, The method includes: the first message includes a synchronization signal length L 0 expected by the second device, and the first device determines the L according to the L 0 , where L≥L 0 .
The method of claim 23, wherein the determining, by the first device, the synchronization signal length L based on the first message comprises:

The first device obtains a channel measurement result based on the first message measurement channel, and determines a synchronization signal length L based on the channel measurement result;

The channel used by the second device to send the first message is a third channel, the channel used by the first device to send the second message is a second channel, and the second channel is the The subchannel of the three channels, the channel measurement result including at least the measurement result of the first device to the second channel.
The method of any one of the preceding claims 23-27, wherein the first interface is a wake-up radio interface, and the second interface is a main communication interface.
A first device, characterized in that it can communicate with a second device, the first device comprising:

Receiving, by the first device, the first message sent by the second device by using the first interface or the second interface;

a determining unit, configured to determine a synchronization signal length L based on the first message;

a generating unit, configured to generate a second message, where the second message includes a first synchronization signal, the length of the first synchronization signal is L;

After receiving the first message, the first interface is further configured to send the second message to the second device.
The first device of claim 29, wherein the first interface or the second interface is further configured to:

Before the first device receives the first message sent by the second device by using the first interface or the second interface, the first device sends a third message by using the first interface or the second interface, so that the The second device measures the channel based on the third message, and obtains a channel measurement result;

The channel used by the first device to send the third message is a first channel, the channel used by the first device to send the second message is a second channel, and the second channel is the a subchannel of the first channel, where the channel measurement result at least includes a measurement result of the second device by the second device.
The first device of claim 30, wherein the second interface is configured to receive a first message sent by the second device, and the determining unit is configured to determine a synchronization signal based on the first message Length L, including:

The channel information includes the channel measurement result, and the first device determines the synchronization signal length L based on the channel measurement result.
The first device of claim 29 or 30, wherein the second interface is configured to receive a first message sent by the second device, and the determining unit is configured to determine, according to the first message Synchronization signal length L, including:

The first message includes a synchronization signal length L 0 desired by the second device, and the first device determines the L based on the L 0 , where L≥L 0 .
The first device according to claim 29, wherein the determining unit is configured to determine a synchronization signal length based on the first message L, including:

The first device obtains a channel measurement result based on the first message measurement channel, and determines a synchronization signal length L based on the channel measurement result;

The channel used by the second device to send the first message is a third channel, the channel used by the first device to send the second message is a second channel, and the second channel is the The subchannel of the three channels, the channel measurement result including at least the measurement result of the first device to the second channel.
The first device of any one of the preceding claims 29-33, wherein the first interface is a wake-up radio interface, and the second interface is a main communication interface.
A first device, the terminal comprising: a processor, a memory and a transceiver;

The transceiver is configured to receive and send data;

The memory is for storing instructions;

The processor is operative to invoke the instructions in the memory to perform the method of any of claims 1-7, 23-28.
A second device, wherein the access point comprises: a processor, a memory, and a transceiver;

The transceiver is configured to receive and send data;

The memory is for storing instructions;

The processor is operative to invoke the instructions in the memory to perform the method of any of claims 8-11.
An apparatus, comprising: a memory, a processor, a first communication interface, and a second communication interface; the memory is configured to store an instruction; the processor is configured to invoke an instruction stored by the memory, by using the A communication interface and the second communication interface perform the method of any of claims 1-11, 23-28.
The device of claim 37, wherein the first communication interface is a wake-up radio frequency interface, and the second communication interface is a main communication interface.
A computer program product, comprising a computer program, characterized in that the computer program, when executed on a computer, causes the computer to implement the method of any of claims 1-11, 23-28.
A computer program, characterized in that the computer program, when executed on a computer, causes the computer to implement the method of any of claims 1-11, 23-28.
A computer readable storage medium having stored thereon a computer program, wherein the computer program, when executed on a computer, causes the computer to implement any of claims 1-11, 23-28 The method described.
A chip, comprising: a processing module and a communication interface, the processing module for performing the method of any one of claims 1-11, 23-28.
The chip according to claim 42, wherein the chip further comprises a storage module (eg, a memory), the storage module is configured to store an instruction, and the processing module is configured to execute an instruction stored by the storage module, And the execution of the instructions stored in the storage module causes the processing module to perform the method of any one of claims 1-11, 23-28.
A communication system, comprising a first device according to any one of claims 1-7, 23-28 and a second device according to any of claims 8-11.