WO2008106846A1

WO2008106846A1 - Method and apparatus for sleep management in wide-band wireless access communication system

Info

Publication number: WO2008106846A1
Application number: PCT/CN2007/003250
Authority: WO
Inventors: Wenchao Ma
Original assignee: Beijing Lenovo Software Ltd.; Lenovo (Beijing) Limited
Priority date: 2007-03-08
Filing date: 2007-11-16
Publication date: 2008-09-12
Also published as: CN101262383A; CN101262383B

Abstract

A method and an apparatus for sleep management in a wide-band wireless access communication system.In this method,when the data transmission intervals of recently successive first predetermined times are all greater or equal than the predetermined interval,the sleep mode is immediately activated,or when the data transmission intervals of recently successive first predetermined times are all less or equal than the predetermined interval,the normal mode is activated;in the predetermined interval,the consumed energy of user's terminal in the sleep mode is greater or equal than the consumed energy of user's terminal in the normal mode.

Description

Sleep management method and device in broadband wireless access communication system

Technical field

The present invention relates to a broadband wireless access communication system, and more particularly to a sleep management method and a sleep management apparatus in a broadband wireless access communication system. Background technique

As the demand for broadband wireless access grows, relevant standards are being developed and related network standards are being developed.

The broadband wireless access communication system can now support the mobility of users, while the user terminal equipment mainly holds the device. An important factor limiting the application of the handheld device is the battery life capability. In order to extend the battery's endurance, in addition to improving the battery technology, the energy management of the device itself is also an effective way.

Therefore, the broadband wireless access communication system proposes a sleep mechanism and a wake-up mechanism to minimize energy consumption during an idle interval in which user packet data is not transmitted, while also reducing interference between channel signals.

The sleep mechanism allows the user terminal to enter a sleep state during idle periods to reduce energy consumption, and when there is uplink or downlink data, the user terminal returns to the normal mode.

The sleep mode defined for the non-real time service in the broadband wireless access communication system is as follows - the user terminal transmits a sleep request including an initial sleep time, an initial sleep window size, a listening window size, and a final sleep window size;

Receiving, by the base station, the sleep request, and returning a feedback message indicating consent if the user terminal is allowed to enter a sleep state;

The user terminal starts to sleep after receiving the feedback message.

The size of the subsequent sleep window is twice that of the previous sleep window but cannot exceed the final sleep window. At the same time, once the uplink and downlink data arrives, the sleep process is terminated and the user terminal performs data transceiving operation.

However, the above mechanism does not specify the conditions for starting the sleep mechanism, nor does it define how to select the parameters. If the starting conditions and parameter selection are not appropriate, it will cause unnecessary energy consumption or transmission delay, retransmission or disconnection. . Summary of the invention

It is an object of the present invention to provide a sleep management method and apparatus in a broadband wireless access communication system, which regulates the initiation and termination of a sleep mechanism, minimizes energy consumption of the user terminal, and ensures timely delivery of downlink data.

In order to achieve the above object, the present invention provides a sleep management method in a broadband wireless access communication system, including the steps of:

The sleep mode is immediately activated when the most consecutive first predetermined number of data transmission intervals are greater than or equal to the predetermined time interval, or is activated when the most consecutive first predetermined number of data transmission intervals are less than or equal to the predetermined time interval. Mode

The energy consumed by the user terminal in the sleep mode is greater than or equal to the energy consumed by the user terminal in the normal mode during the predetermined time interval.

The sleep management method described above, wherein the final sleep window in the sleep mode is smaller than the TCP retransmission timeout.

The above sleep management method, wherein the final sleep window in the sleep mode is less than 1 second.

The sleep management method described above further includes the steps of: in the sleep mode, when the sleep window reaches the final sleep window and continues for a second predetermined number of times, the sleep mode is reactivated after extending the final sleep window.

The sleep management method described above, wherein the extending the final sleep window comprises:

Setting the final sleep window to a predetermined multiple of the original final sleep window; or

The final sleep window is set to a fixed number of frames, which is larger than the original final sleep window. The sleep management method described above, wherein the extending the final sleep window comprises: fixing the final sleep window between 30s and 100s.

In order to achieve the above objectives, the present invention further provides a sleep management apparatus in a broadband wireless access communication system, including:

a data transmission interval obtaining module, configured to acquire a data transmission interval after the data transmission is completed; and a sleep management module, configured to activate the sleep mode when the most consecutive first predetermined number of data transmission intervals are greater than or equal to a predetermined time interval, Or for using the normal mode when the most consecutive first predetermined number of data transmission intervals are less than or equal to the predetermined time interval;

The above sleep management device, wherein the final sleep window in the sleep mode is smaller than the TCP retransmission super Time.

The sleep management device described above, wherein the sleep management module is further configured to reactivate the sleep mode and extend the final sleep window when the sleep window reaches the final sleep window for a second predetermined number of times.

The sleep management method and apparatus of the present invention have the following advantages:

A condition for activation or termination of a sleep mechanism is specified, which determines whether to activate or terminate the sleep mode according to the energy consumption of the user terminal, thereby effectively saving energy consumption of the user terminal and ensuring timely delivery of the downlink data;

In the sleep mode, the TCP retransmission timeout is considered, and the final sleep window is set to be smaller than the TCP retransmission timeout, thereby avoiding unnecessary retransmission caused by excessively long sleep time;

A dual sleep mechanism is set to ensure a balance between energy consumption and delay. DRAWINGS

Figure 1 is a schematic flow chart of the method of the present invention;

Figure 2 is a schematic view showing the structure of the apparatus of the present invention. detailed description

Before explaining the method and apparatus of the present invention in detail, some concepts of the present invention are described in order to provide a better understanding of the present invention.

T _F , frame length;

Ε _τ , the energy consumed by the user terminal to send a sleep request message to the base station;

E _R> energy consumed by the user terminal to receive the sleep feedback message;

E _A , the average energy consumed per frame in normal mode;

E _S , the average energy consumed per frame in sleep mode;

E _W , the energy consumed by the sleep mode to switch to the normal mode;

Wj, initial sleep window size (in frames);

W _L , the size of the listening window (in frames);

W _F , the final sleep window size (in frames).

In the sleep management method and apparatus in the broadband wireless access communication system of the present invention, the start or termination of sleep is determined by a sleep management judgment condition:

The energy consumed by the user terminal cannot be from the start or stop of sleep to the next data transmission and reception. Exceeding the energy consumed to maintain the current state is explained in detail as follows:

When the user terminal switches from the normal mode to the sleep mode at the first time, the energy consumed by the user terminal in the sleep mode cannot exceed the period during which the normal mode is maintained during the second time period from the first time to the next data transmission and reception. energy of;

When the user terminal switches from the sleep mode to the normal mode at the first moment, the energy consumed by the user terminal in the normal mode cannot exceed the consumption of the sleep mode during the second time period from the first time to the next data transmission and reception. energy.

It can be seen from the above-mentioned sleep management judgment condition that the present invention first needs to know the time of the next data transmission and it is possible to perform correct judgment and processing. Therefore, how to determine the time of the next data transmission and reception will be described in detail below.

The present invention assumes the existence of such a situation: the MAC layer calculates the time interval from the last transmission after each completion of the DL UL packet transmission. For convenience of explanation, it is named as the data transmission interval IAT, when continuously scheduled. After the data transmission interval IAT of the number of times (such as 2 times, 3 times, 5 times, ...) is greater than or less than a certain time, the next data transmission interval IAT is considered to be greater or smaller than the time.

If the data transmission interval IAT is greater than or less than 5s for 4 consecutive times, the next data transmission interval IAT is considered to be greater or less than 5s.

After the time of the next data transmission can be known, the predetermined time interval should be determined according to the energy consumption in the sleep mode and the energy consumption in the normal mode for the sleep management judgment condition.

The following is a detailed description of how to select the predetermined time interval for the sleep management judgment condition, and the predetermined time is described as N frames.

First, whether the data should enter the sleep mode after the data is sent and received is described as ^, wherein the size of the subsequent sleep window in the sleep mode is twice that of the previous sleep window, and the listening window is 1 frame.

After the user terminal performs the current data transmission and reception, if the normal mode is maintained and the sleep mode is not entered, the energy NE _A consumed from the end of the current data transmission and reception to the start of the next data transmission and reception.

After the user terminal performs the data transmission and reception, if it enters the sleep mode, in the most ideal case, when the subsequent Nth frame enters the interception (assuming that K is interrupted at this time), the downlink data is detected, and then the normal data is entered. Mode, the energy consumed during this time includes the following parts:

The energy Ε _τ consumed by the user terminal to send the sleep request message to the base station, the energy E _R consumed by the user terminal to receive the sleep feedback message, the energy KE _W consumed by the sleep mode to switch to the normal mode, and the energy consumption of the user terminal in the sleep mode (2 ^K — 1 ) E _S , the energy consumed by the listener KE _A and used to process the hair The energy consumed by the 2 normal frames sent by the sleep request and receiving the feedback message 2E _A .

According to the above energy consumption analysis, if the following inequality (1) is established, it should go to sleep, otherwise the existing normal state is maintained.

ET+ER+KE _W + ( 2 ^K - 1 ) E _S + (K+2 ) E _A ≤NE _A (1) Of course, the above situation is that when the subsequent Nth frame enters the interception, it is heard that there is Downstream data, and assume that the user terminal is still in a sleep state at this time, and only after the sleep state ends (assumed to be an M frame) can the downlink data be found, then the energy consumption of entering the sleep state during the time of the N+M frame is of course It will also be less than in a normal state, because the energy consumption of the next M frame in the sleep state is of course smaller than the energy consumption in the normal state.

Inequality (1) can have multiple Ns that satisfy the condition, and the smallest one should be selected here, because if you do not choose the smallest one, it may cause waste of energy, such as N may be 8, 9, 10, ..., At this time, if 10 is selected, and the next data transmission and reception may arrive at the subsequent ninth frame, the user terminal will not go to sleep at this time, which will result in waste of energy.

At the same time, inequality (1) also includes a parameter K, indicating the number of times of entering sleep, and there are certain selection conditions for the parameter ,, which must satisfy the following inequality (2):

2 ^Κ - 1+Κ+4 <Ν (2) In sleep mode, if the number of sleeps is Κ, the number of frames in the period is 2 ^Κ — 1+Κ, and at least 1 time in the frame For sleep, the number of frames required is 2 ^Κ — 1+K+4, and the next 4 frames include 2 frames entering the first sleep and 2 frames requesting sleep, so the frame must satisfy the minimum number of frames for performing sleep. .

Here, determining the defect includes the following steps:

Step Al, select Ν value is 6;

Step Α2, according to the Ν value, the maximum Κ value using the inequality (2) is satisfied;

Step A3, determining whether the Ν value and the Κ value satisfy the inequality (1), and if so, acquiring the Ν value and using the sleep management judgment condition, otherwise proceeding to step Α4;

Step Α4, add 1 to the original Ν value as the new Ν value, and return to step Α2.

The above is the description that the size of the subsequent sleep window in the sleep mode is twice that of the previous sleep window, and the listening window is one frame. Of course, the sleep window is fixed to a frame in the sleep mode, and the listening window is fixed to In the case of b frames, the above two inequalities are - E _T + E _R + KEw + KaE _s + (Kb + 2) E _A ≤ NE _A Kb+Ka+4 <N

Of course, for the other cases, the corresponding two inequalities can also be obtained.

A first embodiment of the sleep management method in the broadband wireless access communication system of the present invention is as shown in Fig. 1, and includes:

Step 11: After the data transmission is completed, obtain a data transmission interval;

Step 12, determining whether the last three consecutive data transmission intervals are greater than or equal to a predetermined time interval, and if so, proceeding to step 13, otherwise proceeding to step 14;

Step 13 , immediately activate the sleep mode and perform a sleep process;

Step 14, determining whether the data transmission interval of three consecutive times is less than or equal to the predetermined time interval, and if yes, proceeding to step 15;

Step 15. Enter the normal mode. There are two cases here: Return to the normal mode after maintaining the normal mode or ending the sleep mode.

The step 13 specifically includes: Step 131, the user terminal sends a sleep request to the base station to start sleep time, initial sleep window size, listening window size, and final sleep window size;

Step 132: The user terminal starts to sleep after receiving the feedback message indicating that the base station agrees to enter sleep. Step 133: In the sleep mode, the sending and receiving of the data packet causes the sleep to be terminated, and the data packet transmitting and receiving operation is performed, and then returns to step 11.

The determination of the final sleep window is involved in the sleep processing in step 13. The sleep management method of the present invention takes into account the TCP retransmission timeout. If the final sleep window is set too long, it will cause unnecessary retransmission, so the present invention In the sleep management method, the length of the final sleep window is set to be smaller than the TCP retransmission timeout, that is, ^^! ^And Ding! The product of : is less than the retransmission timeout of TCP. Here, according to the retransmission timeout in the actual broadband wireless access communication system, the product of W _F and T _F is set to be smaller than ls in the specific embodiment.

At the same time, in the actual situation, the following situations may also be included, and there is no data transmission for a long time, and the final sleep window has been continuously repeated in the sleep mode. At this time, the present invention introduces a level 2 sleep mechanism, further saving users. The energy consumption of the terminal includes the following steps:

Step 21, determining whether the sleep window reaches the final sleep window, and finally the sleep window continues for a predetermined number of times, if it is to proceed to step 22, otherwise proceeds to step 23;

Step 22, re-activate sleep mode and extend the final sleep window;

Step 23, continue to process according to the process of step 13. Here, the extended final sleep window can be in the following manner:

1. Set the final sleep window to a predetermined multiple of the original final sleep window, such as 2 times, 3 times, 5 times, etc.;

2. The final sleep window is fixed to an M frame, which is larger than the original final sleep window;

3. Set the initial sleep window and the final sleep window to a predetermined multiple of the original initial sleep window and the final sleep window, such as 2 times, 3 times, 5 times, etc.;

4. Fix the initial sleep window and the final sleep window to M frames, which are larger than the original final sleep window.

According to the statistics of the user data transmission and reception time interval, it is found to be between 30s and 100s, so the initial sleep window and the final sleep window can be fixed between 30s and 100s.

The sleep management device in the broadband wireless access communication system of the present invention, as shown in FIG. 2, includes: a data transmission interval acquisition module, configured to acquire two adjacent data transmission intervals after the data transmission is completed;

a data transmission interval judging module, configured to determine a size relationship between a data transmission interval of a predetermined predetermined number of times and a predetermined time interval;

The sleep management module is configured to activate the sleep mode when the most recent predetermined number of data transmission intervals are greater than or equal to the predetermined time interval, and enter a normal state when the most recent predetermined number of data transmission intervals are less than or equal to the predetermined time interval.

At the same time, the predetermined number of times can be adjusted, which can be 1, 2, 3 or more times. However, in actual situations, it should be considered: If 1 or 2 consecutive data transmission intervals are greater than or equal to / less than or equal to The predetermined time interval is not sufficient to determine that such a situation will occur in the next data transmission interval. Therefore, in the specific embodiment of the present invention, the number of occurrences which is representative of the predetermined number of times may be selected three times.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

Claims

Rights request

A sleep management method in a broadband wireless access communication system, comprising the steps of:

2. The sleep management method according to claim 1, wherein the final sleep window in the sleep mode is smaller than the retransmission timeout of the TCP.

The sleep management method according to claim 2, wherein the final sleep window in the sleep mode is less than 1 second.

4. The sleep management method according to claim 1, further comprising the steps of:

In sleep mode, when the sleep window reaches the final sleep window and continues for a second predetermined number of times, the sleep mode is reactivated after extending the final sleep window.

The sleep management method according to claim 4, wherein the extending the final sleep window comprises:

Set the final sleep window to 2 or more times the original final sleep window; or

The final sleep window is set to a fixed number of frames, which is larger than the original final sleep window.

The sleep management method according to claim 4, wherein the extending the final sleep window comprises: fixing the final sleep window between 30s and 100s.

7. A sleep management device in a broadband wireless access communication system, comprising:

8. The sleep management device according to claim 7, wherein the final sleep window in the sleep mode Retransmission timeout less than TCP.

9. The sleep management apparatus according to claim 7, wherein the sleep management module is further configured to reactivate the sleep mode and extend the final sleep window when the sleep window reaches the final sleep window and continues for a second predetermined number of times.