Patent Description:
In July <NUM>, <NUM> established a research group WUR (Wake-Up Receiver) of next generation Wi-Fi (Wireless Fidelity) technology, which was mainly used in the Internet of Things in order to save the power consumption of the devices as much as possible.

In the standard-setting process, two forms of receiving data by a device are defined in a document: the first is to receive a normal data packet; the second is to receive a wake-up frame, wherein after receiving a wake-up frame, a master communication device in a sleep state will restore an awake state for normal data communication. Thus, the purpose of defining a wake-up frame is to facilitate saving power consumption of the device, wherein the main communication refers to data communication of IEEE802. <NUM> or other signaling communication, e.g., sending a probe request frame, etc..

<CIT>, <CIT>, <CIT> and Standard for Information Technology- Telecommunications and information exchange between systems - Local and Metropolitan Area networks - Specific requirements - Part <NUM>: Wireless LAN.

<NPL> and <CIT> disclose aspects of Wi-Fi.

In order to fulfill the requirements of the WUR, for a CS (Carrier Sense)/CCA (Clear Channel Assessment) state machine, two states need to be defined: a state of sensing a normal data frame and a state of sensing a wake-up frame.

However, in the existing Wi-Fi standards, only the state machine for sensing a normal data frame is specified, and the state machine for sensing a wake-up frame is not specified. Therefore, it is necessary to redefine the state machine in order to fulfill the requirements of the WUR.

Just based on at least one of the technical problems described above, the present disclosure proposes a new communication solution for a wireless local area network, so that a device can respectively sense a wake-up frame and a normal data frame via different CS/CCA state machines physically separated or logically separated, fulfilling the requirements of the WUR, and thereby facilitating the reduction of device energy consumption.

The invention is a defined in claim <NUM>.

In this technical solution, since the CS/CCA state machine for sensing a wake-up frame and the CS/CCA state machine for sensing a non-wake-up frame are physically separated or logically separated, the device can respectively sense a wake-up frame and a normal data frame, which is a non-wake-up frame, via different CS/CCA state machines physically separated or logically separated, fulfilling the requirements of the WUR, and thereby facilitating the reduction of device energy consumption. In addition, since the sending power of the wake-up frame is generally small, by determining the type of the communication frame according to the receiving power of the communication frame, it is also possible to easily distinguish between the wake-up frame and the normal data frame, so as to ensure efficient utilization of the WUR mechanism.

In the above, when the CS/CCA state machine for sensing a wake-up frame and the CS/CCA state machine for sensing a non-wake-up frame are physically separated, the two state machines are two physical entities; and when the CS/CCA state machine for sensing a wake-up frame and the CS/CCA state machine for sensing a non-wake-up frame are logically separated, the two state machines share one physical entity.

In the above-mentioned technical solution, preferably, the step of determining, according to the receiving power of the communication frame, the type of the communication frame specifically comprises: determining that the communication frame is a wake-up frame, when the receiving power of the communication frame is less than or equal to a predetermined power value; and determining that the communication frame is a non-wake-up frame, when the receiving power of the communication frame is greater than the predetermined power value.

In any of the above-mentioned technical solutions, preferably, the communication method for a wireless local area network further comprises: entering an awake state to communicate with a sender of the communication frame, when it is determined that the communication frame is a wake-up frame.

For example, before receiving the wake-up frame, the device is in a sleep state, a power saving state, or a state defined by the wake-up frame (this state also serves to reduce the power consumption of the device), which can effectively reduce the power consumption of the device. When receiving the wake-up frame, the device enters an awake state to communicate with the sender of the communication frame.

According to an aspect of the present disclosure, there is further provided a communication method for a wireless local area network, comprising: generating a wake-up frame; and sending the wake-up frame by using a sending power which is less than or equal to a predetermined value.

In the technical solution, by making the sending power of the wake-up frame less than or equal to a predetermined value, the sending of the wake-up frame can cause as little interference as possible to the transmission of other data frames, and at the same time, after receiving the wake-up frame, the receiver of the wake-up frame can determine, according to the receiving power of the wake-up frame, that it is a wake-up frame that has been received.

The invention is further defined in claim <NUM>, which refers to a communication apparatus for a wireless local area network.

In the above-mentioned technical solution, preferably, the determining unit is specifically used for: determining that the communication frame is a wake-up frame, when the receiving power of the communication frame is less than or equal to a predetermined power value; and determining that the communication frame is a non-wake-up frame, when the receiving power of the communication frame is greater than the predetermined power value.

In any of the above-mentioned technical solutions, preferably, the communication apparatus for a wireless local area network further comprises: a processing unit for entering an awake state to communicate with a sender of the communication frame, when the determining unit determines that the communication frame is a wake-up frame.

According to an aspect of the present disclosure, there is further provided a communication apparatus for a wireless local area network, comprising: a generating unit for generating a wake-up frame; and a sending unit for sending the wake-up frame by using a sending power which is less than or equal to a predetermined value.

According to the fifth aspect of the present disclosure, there is further provided an access point, comprising: the communication apparatus for a wireless local area network as described above in the third aspect; and/or the communication apparatus for a wireless local area network as described above in the fourth aspect.

According to the sixth aspect of the present disclosure, there is further provided a station, comprising: the communication apparatus for a wireless local area network as described above in the third aspect; and/or the communication apparatus for a wireless local area network as described above in the fourth aspect.

By means of the above-mentioned technical solutions, the device can respectively sense a wake-up frame and a normal data frame via different CS/CCA state machines physically separated or logically separated, fulfilling the requirements of the WUR, and thereby facilitating the reduction of device energy consumption.

In order that the above-mentioned objectives, features and advantages of the present disclosure can be understood more clearly, a further detailed description of the present disclosure will be given below in connection with accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with one another if there is no conflict.

However, the present disclosure can also be implemented in other manners than those described herein. Therefore, the protection scope of the present disclosure is not limited to the specific embodiments disclosed below.

<FIG> is a schematic flowchart of a communication method for a wireless local area network according to a first embodiment of the present disclosure.

As shown in <FIG>, the communication method for a wireless local area network according to the first embodiment of the present disclosure comprises:.

Specifically, step S12specifically comprises: determining that the communication frame is a wake-up frame, when the receiving power of the communication frame is less than or equal to a predetermined power value; and determining that the communication frame is a non-wake-up frame, when the receiving power of the communication frame is greater than the predetermined power value.

For example, the transmitting power of the wake-up frame is <NUM> microwatts, there will be a loss in signal strength during the transmission of the wake-up frame, then the receiving power must be less than <NUM> microwatts, for example, when the receiving power is greater than <NUM> microwatts, it can be determined that what has been received is not a wake-up frame. Of course, the transmitting power of the wake-up frame may be other values, which will not be further described here.

In the communication method shown in <FIG>,since the CS/CCA state machine for sensing a wake-up frame and the CS/CCA state machine for sensing a non-wake-up frame are physically separated or logically separated, the device can respectively sense a wake-up frame and a normal data frame (such as a non-wake-up frame) via different CS/CCA state machines physically separated or logically separated, fulfilling the requirements of the WUR, and thereby facilitating the reduction of device energy consumption. In addition, since the sending power of the wake-up frame is generally small, by determining the type of the communication frame according to the receiving power of the communication frame, it is also possible to easily distinguish between the wake-up frame and the normal data frame, so as to ensure efficient utilization of the WUR mechanism.

Further, the communication method for a wireless local area network also comprises: entering an awake state to communicate with a sender of the communication frame, when it is determined that the communication frame is a wake-up frame.

In the above, the execution subject of the communication method shown in <FIG> may be an access point, such as a router, etc., or may be a station, such as a mobile phone, PDA (Personal Digital Assistant, palm computer) or the like.

<FIG> is a schematic block diagram of a communication apparatus for a wireless local area network according to the first embodiment of the present disclosure.

As shown in <FIG>, the communication apparatus <NUM> for a wireless local area network according to the first embodiment of the present disclosure comprises: a receiving unit <NUM>, a sensing unit <NUM> and a determining unit <NUM>.

In the above, the receiving unit <NUM> is used for receiving a communication frame; the sensing unit <NUM> is used for sensing a receiving power of the communication frame via a CS/CCA state machine, wherein a CS/CCA state machine for sensing a wake-up frame and a CS/CCA state machine for sensing a non-wake-up frame are physically separated or logically separated; and the determining unit <NUM> is used for determining the type of the communication frame, according to the receiving power of the communication frame.

In specific implementation, the receiving unit <NUM> may be a receiver, an antenna or the like, and the sensing unit <NUM> and the determining unit <NUM> may be a central processor, a baseband processor or the like.

In this technical solution, since the CS/CCA state machine for sensing a wake-up frame and the CS/CCA state machine for sensing a non-wake-up frame are physically separated or logically separated, the device can respectively sense a wake-up frame and a normal data frame (such as a non-wake-up frame) via different CS/CCA state machines physically separated or logically separated, fulfilling the requirements of the WUR, and thereby facilitating the reduction of device energy consumption. In addition, since the sending power of the wake-up frame is generally small, by determining the type of the communication frame according to the receiving power of the communication frame, it is also possible to easily distinguish between the wake-up frame and the normal data frame, so as to ensure efficient utilization of the WUR mechanism.

In the above-mentioned technical solution, preferably, the determining unit <NUM> is specifically used for: determining that the communication frame is a wake-up frame, when the receiving power of the communication frame is less than or equal to a predetermined power value; and determining that the communication frame is a non-wake-up frame, when the receiving power of the communication frame is greater than the predetermined power value.

For example, the transmitting power of the wake-up frame is <NUM> microwatts, there will be a loss in signal strength during the transmission of the wake-up frame, then the receiving power at which the receiver receives the wake-up frame must be less than <NUM> microwatts; if the receiving power is greater than <NUM> microwatts, it can be determined that what the receiver has received is not a wake-up frame. Of course, the sending power of the wake-up frame may be other values, which will not be further described here.

In any of the above-mentioned technical solutions, preferably, the communication apparatus <NUM> for a wireless local area network further comprises: a processing unit <NUM> for entering an awake state to communicate with a sender of the communication frame, when the determining unit <NUM> determines that the communication frame is a wake-up frame.

In specific implementation, the processing unit <NUM> may be a central processor, a baseband processor or the like.

<FIG> is a schematic flowchart of a communication method for a wireless local area network according to a second embodiment of the present disclosure.

As shown in <FIG>, the communication method for a wireless local area network according to the second embodiment of the present disclosure comprises:.

Specifically, for example, the sending power of the wake-up frame is set to <NUM> microwatts, since there will be a loss in signal strength during the transmission of the wake-up frame, the receiving power at which the receiver receives the wake-up frame must be less than <NUM> microwatts; if the receiving power is greater than <NUM> microwatts, it can be determined that what the receiver has received is not a wake-up frame. Of course, the sending power of the wake-up frame may be other values, which will not be further described here.

In the above, the execution subject of the communication method shown in <FIG> may be an access point, such as a router, etc., or may be a station, such as a mobile phone, PDA or the like.

<FIG> is a schematic block diagram of a communication apparatus for a wireless local area network according to the second embodiment of the present disclosure.

As shown in <FIG>, the communication apparatus <NUM> for a wireless local area network according to the second embodiment of the present disclosure comprises: a generating unit <NUM> and a sending unit <NUM>.

In the above, the generating unit <NUM> is used for generating a wake-up frame; and the sending unit <NUM> is used for sending the wake-up frame, a sending power of the wake-up frame being less than or equal to a predetermined value.

In specific implementation, the generating unit <NUM> may be a signal processor, a central processor, a baseband processor or the like; and the sending unit <NUM> may be a transmitter, an antenna or the like.

The present disclosure further provides an access point, comprising: the communication apparatus <NUM> for a wireless local area network as shown in <FIG>; and/or the communication apparatus <NUM> for a wireless local area network as shown in <FIG>.

The present disclosure further provides a station, comprising: the communication apparatus <NUM> for a wireless local area network as shown in <FIG>; and/or the communication apparatus <NUM> for a wireless local area network as shown in <FIG>.

To sum up, the technical solution of the present disclosure mainly is determining whether a wake-up frame has been received, by increasing the functions of the CS/CCA such that it can receive a frame and sense the type of the frame, thereby determining the operation of the device, which is specifically as follows:
Two sets of CCA determination mechanisms are maintained in a CS/CCA state machine. After the receiver receives a communication frame, the state machine determines the type of the received frame according to the sensed power of the receiver, if the received power is relatively small, it can be determined that a wake up communication frame has been received; and if the power is relatively large, it can be determined that a communication frame other than a wake up communication frame has been received. When it has been determined that the received communication frame is a wake-up frame, if the device is in a sleep state, a power saving state, or a state defined by the wake-up frame, the device is brought into an awake state by call instructions so as to communicate with the sender of the wake-up frame.

Specifically, as shown in <FIG>, one physical entity CS/CCA state machine maintains two sets of CCA determination mechanisms, wherein the CS/CCA state machine for sensing a wake-up frame is logically separated from the CS/CCA for sensing a normal data frame. After the receiving state machine receives a communication frame, the CS/CCA state machine senses the receiving power of the communication frame to determine whether a wake-up frame has been received, and may enter an awake state after receiving a wake-up frame, and data is sent by a sending state machine.

As shown in <FIG>, one device may have two physical entity CS/CCA state machines, one is for sensing a wake-up frame (i.e., the CS/CCA state machine for a wake-up frame shown in <FIG>), and the other is for sensing a normal data frame (i.e. the CS/CCA state machine for IEEE802. <NUM> communication shown in <FIG>), that is, the CS/CCA state machine for sensing a wake-up frame is physically separated from the CS/CCA for sensing a normal data frame. After the receiving state machine receives a communication frame, if the CS/CCA state machine for sensing a wake-up frame senses that the communication frame is a wake-up frame, the CS/CCA state machine for sensing a normal data frame is awakened, so that the device enters the awake state and then sends data via the sending state machine.

Claim 1:
A communication method for a wireless local area network, comprising:
receiving (S10) a communication frame;
sensing a receiving power of the communication frame via a CS/CCA state machine for sensing a wake-up frame and a CS/CCA state machine for sensing a non-wake-up frame; and
determining (S12) the type of the communication frame, according to the receiving power of the communication frame,
characterized in that
the CS/CCA state machine for sensing the wake-up frame and the CS/CCA state machine for sensing the non-wake-up frame are
- physically separated or
- logically separated, wherein the two CS/CCA state machines share one physical entity, wherein one physical entity CS/CCA state machine maintains two sets of CCA determination mechanisms, wherein after a receiving state machine receives a communication frame, the CS/CCA state machine senses the receiving power of the communication frame to determine whether the wake-up frame has been received, enters an awake state after receiving the wake-up frame, and data is sent by a sending state machine.