CN101483918B - Buffer condition report sending method and apparatus thereof - Google Patents
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Abstract
An embodiment of the invention provides a method for sending buffer area status report and a device thereof. The method is used for confirming BSR trigger event and sending BSR by setting upper sending buffer area occupancy factor threshold, or time delay threshold, or finger. The method can provide buffer area status information with timely, high efficiency and giving attention to advanced serve requirement, at the same time reduces BSR sending cost, accordingly, the method is suitable for various operation that is sensitivity to packet loss ratio, time delay or requirement having advanced serve order.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method and an apparatus for transmitting a buffer status report.
Background
The Long Term Evolution (LTE) project prepares a mobile communication architecture that will be pushed in the next 10 years mainly for the 3GPP organization. In the existing LTE system, a base station performs unified scheduling on uplink transmissions of different terminals, thereby improving the channel utilization rate. The uplink dynamic scheduling process specifically comprises the following steps:
step one, the terminal sends an uplink scheduling information report to the base station under the trigger of a timer or an event. Among the uplink scheduling information reports, the most important is a Buffer Status Report (BSR), and in addition, a Power Headroom (Power Headroom) report may be included.
And step two, the base station allocates resources for the terminals according to a certain strategy according to the available resource condition and the uplink scheduling information of all the terminals, and generates authorization information for uplink transmission of the terminals.
And step three, the base station sends the authorization information to the terminal.
And step four, the terminal sends data and control information in an uplink mode according to the authorization information.
In the LTE system, in order to reduce overhead of reporting uplink scheduling information, uplink buffers (typically, uplink transmission buffers of a Radio link control layer) in a terminal may be grouped according to priorities of corresponding Radio Bearers (RBs), and report buffer status may be grouped. The frequency of sending the BSR may also be controlled, that is, the overhead of reporting the uplink scheduling information is further reduced by controlling the trigger condition of the BSR. The existing BSR triggering conditions are mainly the following:
1. the total buffer size increases by more than a threshold.
The size of each uplink transmission buffer in the terminal is limited, and the method judges whether the uplink transmission buffer is a BSR triggering event or not by using the condition of the total buffer.
2. The time since the last transmission of a BSR exceeds the threshold.
3. High priority data arrives in the buffer.
According to the QoS requirement of the service, the urgency degree of the signaling and other factors, the LTE system allocates corresponding priority to each uplink RB, and performs uplink resource scheduling and data transmission according to the priority.
According to the technical scheme disclosed by the above, the defects of the prior art are as follows:
1) the fullness degree of each uplink buffer area is not considered, and the packet loss phenomenon may be generated due to the overflow of the uplink sending buffer area, so that the method is not suitable for the service with higher packet loss rate sensitivity;
2) the system is difficult to determine a proper delay threshold for services with different requirements on the sensitivity of the delay, so that redundant BSR is generated or data is discarded, and the system is not suitable for the services with higher sensitivity to the delay.
3) Higher priority setting requirements can cause the system to have difficulty in determining a proper relative priority as a high priority, thereby generating redundant BSRs, and untimely BSR reporting, which can cause the differentiated services provided by the system to be inconsistent with the RB priority order.
As can be seen from the above, the BSR sending method in the prior art cannot provide timely, efficient and priority service requirement buffer status information for the base station, and cannot meet the service requirement that the packet loss rate or the delay sensitivity is high or the service needs to be performed according to the priority order.
Disclosure of Invention
The invention aims to solve the problem that a BSR sending method in the prior art cannot meet the requirement of providing timely, efficient and priority service requirement buffer area state information for a base station.
An embodiment of the present invention provides a method for sending a buffer status report, including the following steps:
the terminal sets up the occupancy rate threshold of the uplink transmission buffer area for the wireless bearer, and when the actual occupancy rate of the uplink transmission buffer area reaches the occupancy rate threshold of the uplink transmission buffer area, the terminal considers that the uplink transmission buffer area is a Buffer Status Report (BSR) trigger event, or
The terminal sets a delay threshold of an uplink sending buffer for a radio bearer, and when the waiting time of the queue head data in the uplink sending buffer reaches the delay threshold of the uplink sending buffer, the terminal considers that the data is a BSR trigger event or
The terminal configures a pointer for each uplink transmission buffer, wherein the pointer is used for indicating the position of reported data in the corresponding buffer, and when the uplink transmission buffer with the highest priority in the terminal has unreported data or all data with the highest priority in waiting data of all uplink transmission buffers are unreported data, the uplink transmission buffer is regarded as a BSR triggering event;
the terminal generates a BSR and sends the BSR to a base station. An embodiment of the present invention further provides an apparatus, which includes:
a trigger condition setting unit for setting a threshold;
the BSR triggering unit is used for triggering the BSR generation and sending unit when the triggering condition is determined to be met;
and the BSR generation and transmission unit is used for generating the BSR according to the trigger of the BSR trigger unit and transmitting the BSR to the base station.
The invention can provide timely and efficient buffer area state information considering priority service requirements for the base station while reducing the BSR sending overhead through the method of determining the BSR event and sending the BSR, thereby being suitable for different services which are sensitive to packet loss rate, time delay or priority service sequence requirements.
Drawings
Fig. 1 is a schematic flow chart of BSR transmission when uplink transmission resources exist in the embodiment of the present invention;
fig. 2 is a schematic flow chart of BSR transmission when there is no uplink transmission resource in the embodiment of the present invention;
fig. 3 is a BSR triggering diagram according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment of the present invention specifically includes the steps of:
step one, the terminal sets up the occupancy rate threshold of the uplink sending buffer area for the RB.
The threshold can be set according to the sensitivity of the RB corresponding to the buffer to the packet loss rate, and the value range is [0, 100% ]. The larger the maximum packet loss rate that the RB can accept, that is, the lower the sensitivity of the RB to the packet loss rate, the larger the uplink transmission buffer occupancy threshold of the RB can be set; correspondingly, if the maximum packet loss rate that the RB can accept is smaller, that is, the sensitivity of the RB to the packet loss rate is higher, the uplink transmission buffer occupancy threshold of the RB may be set smaller. For example, if the maximum acceptable packet loss rate of the RB is 1%, the threshold may be set to 80%; the maximum acceptable packet loss rate for the RB is 0.1%, the threshold should be less than 80%, for example, the threshold may be set to 60%.
And step two, when the actual occupancy rate of the uplink sending buffer reaches the set threshold, the actual occupancy rate is regarded as a BSR triggering event.
When the queue of the uplink sending buffer changes, the terminal records the actual occupancy rate of the uplink sending buffer, compares the actual occupancy rate with the threshold set in the step one, and if the actual occupancy rate reaches the threshold set in the step one, the terminal is regarded as a BSR triggering event. In this step, the queue change of the uplink transmission buffer may be the case that data arrives at the buffer or data moves out of the buffer.
And step three, the terminal generates a BSR and sends the BSR to the base station.
As shown in fig. 1, after determining a BSR triggering event, a terminal generates a BSR when obtaining sufficient uplink grant resources for sending the BSR, and sends the BSR to a base station in an uplink subframe where the uplink grant resources are located. Because the system settings may be different, the terminal may use the pre-allocated uplink resource to send the BSR, and may also wait for the uplink grant sent by the base station, and send the BSR to the base station after obtaining the uplink grant.
Further, as shown in fig. 2, when the terminal finds that the system does not have enough uplink grant resources to send the BSR, the terminal first sends an SR (Scheduling Request) to the base station, and after obtaining the uplink grant sent by the base station, the terminal generates a BSR and sends the BSR to the base station.
The first embodiment of the invention can report the BSR in time, effectively avoid packet loss caused by overflow of the uplink transmission buffer area and is suitable for services with higher sensitivity to packet loss rate.
The second embodiment of the present invention specifically includes the steps of:
step one, the terminal sets up the time delay threshold of the uplink sending buffer area for the RB.
The threshold may be set according to the sensitivity of the RB corresponding to the uplink transmission buffer to the delay. The larger the maximum time delay that the RB can accept, that is, the lower the sensitivity of the RB to the time delay, the larger the time delay threshold can be set when the uplink of the RB transmits the buffer; correspondingly, if the maximum time delay that the RB can accept is smaller, that is, the sensitivity of the RB to the time delay is higher, the time delay threshold may be set smaller when the uplink transmission buffer of the RB is configured. The threshold is usually not greater than the maximum time delay acceptable by the RB, and further, a specific threshold may be set according to the time of scheduling, data processing, and uplink transmission (including HARQ retransmission). For example, if the maximum delay that the RB can accept is 40ms, the threshold may be set to 10 ms; the maximum delay that the RB can accept is 60ms, the threshold should be greater than 10ms, for example, the threshold may be set to 30 ms.
And step two, when the waiting time of the queue head data in the uplink transmission buffer reaches the set threshold, the queue head data is regarded as a BSR triggering event.
When the data enters the uplink sending buffer area, the terminal starts a timer with a timer value as the threshold set in the step one for the data. If the timer is up, it is considered as a BSR triggering event. Further, when the data is reported (i.e. the data becomes reported data), or moves out of the buffer, or the timer timing arrives, the terminal deletes its corresponding timer.
Step three, which is the same as step three in the first embodiment, is not described again.
The second embodiment of the invention can report the BSR in time, effectively avoid the discarding of the data due to overlong waiting time of the uplink sending buffer, and is suitable for the service with higher sensitivity to time delay.
The third embodiment of the present invention specifically includes the steps of:
step one, a terminal configures a pointer for each uplink transmission buffer area, wherein the pointer is used for indicating the position of reported data in the corresponding buffer area.
The terminal configures a pointer for each uplink transmission buffer and points the pointer to the start position of the corresponding buffer. When the terminal generates the BSR, each pointer is moved to the last position of the reported data in the corresponding buffer. If part of the reported data moves out of the buffer, the corresponding pointer will point to the last location of the reported data. If all the reported data is moved out of the buffer, the corresponding pointer is pointed to the beginning of the buffer. If the BSR report fails, the pointers of each buffer are redirected to the positions pointed by the pointers before the BSR report.
And step two, when the uplink sending buffer with the highest priority in the terminal has unreported data or all data with the highest priority in the waiting data of the uplink sending buffer are unreported data, the uplink sending buffer is regarded as a BSR triggering event.
When data enters or moves out of a certain uplink transmission buffer, the terminal checks whether waiting data exists in all uplink transmission buffers according to the priority sequence (from high to low) of the uplink transmission buffers, and if the waiting data exists in the certain uplink transmission buffer and a pointer corresponding to the buffer is not positioned at the starting position of the buffer, the terminal does not consider a BSR triggering event; if there is waiting data in some uplink transmission buffer and the pointer corresponding to the buffer is at the start position of the buffer, all data with the highest priority in the waiting data is considered to be unreported data, and is considered to be a BSR triggering event. Further, if there are other buffers in the terminal with the same priority as the above-mentioned buffer (for example, priority a), and the corresponding pointers of these other buffers with priority a are all at the beginning position of their buffers, all the data with the highest priority in the waiting data are considered as unreported data, and are considered as BSR triggering events.
As shown in fig. 3, the terminal has 5 uplink transmission buffers A, B, C, D, E, the initial states are all empty, and the priorities are 1, 2, 3, 4, and 5, respectively. Wherein, the priority of A is 1, which means that the priority of A is the highest, and the priority of E is 5, which means that the priority of E is the lowest.
At time t0, new data enters E and the other buffers are empty. At this time, only the data just entering E is the waiting data, and its priority is highest among all the waiting data, and thus it is considered as a BSR triggering event.
At time t1, new data enters B, with waiting data in D and E, and A and C empty. At this time, the waiting data in B has the highest priority and is all unreported data, and therefore is considered to be a BSR triggering event.
At time t2, new data enters A, there is data in all buffers, and there is reported data in A. At this point, the waiting data in a has the highest priority, but contains the reported data, and is therefore not considered a BSR triggering event.
At time t3, new data enters into D where data originally exists, A and B are both empty, and waiting data exists in C and E. At this point, the priority of the waiting data in C is highest, but the waiting data is reported data and is therefore not considered a BSR triggering event.
At time t4, the terminal obtains the uplink grant resource and moves out data A, the remaining data in A has unreported data, B and C are both empty, and D and E have waiting data. At this time, the uplink transmission buffer a with the highest priority has unreported waiting data, and thus is considered as a BSR trigger event.
At time t5, there is a data move out of C, C is empty, and both A and B are empty, while there is waiting data in both D and E, and the waiting data in D is unreported. At this time, the waiting data in D has the highest priority and is all unreported data, and therefore is considered to be a BSR triggering event.
Step three, which is the same as step three in the first embodiment, is not described again.
The third embodiment of the invention can report the BSR in time, and effectively avoids that the data with higher priority is not sent uplink in time due to the fact that the BSR is not sent in time, thereby better executing the scheduling based on the priority and improving the system throughput.
It will be understood by those skilled in the art that an operator may select one or any combination of the BSR transmission methods according to the system requirements, without departing from the scope of the present invention.
A device according to a fourth embodiment of the present invention includes a threshold setting unit, a BSR triggering unit, and a BSR generating and sending unit.
The trigger condition setting unit is configured to set a corresponding threshold, and specifically, the unit sets one or any combination of an occupancy rate threshold of an uplink transmission buffer, or a delay threshold of the uplink transmission buffer, or a pointer indicating a position of reported data in the corresponding buffer.
The BSR triggering unit is used for judging whether the BSR triggering event is the BSR triggering event according to the triggering condition set by the triggering condition setting unit
The BSR generation and transmission unit is connected with the BSR trigger unit and used for generating the BSR when determining the BSR trigger event and transmitting the BSR to the base station.
Optionally, the apparatus may further include an uplink grant unit, configured to send the SR to the base station, and receive an uplink grant.
The embodiment of the invention can provide timely and efficient buffer area state information considering priority service requirements for a base station while reducing the cost of BSR transmission by determining the BSR event and transmitting the BSR, thereby being suitable for different services which are sensitive to packet loss rate, time delay or priority service sequence requirements.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (12)
1. A method for sending a Buffer Status Report (BSR), the method comprising:
the terminal sets up the occupancy rate threshold of the uplink transmission buffer area for the wireless bearer, and when the actual occupancy rate of the uplink transmission buffer area reaches the occupancy rate threshold of the uplink transmission buffer area, the uplink transmission buffer area is regarded as a BSR trigger event or a BSR trigger event
The terminal sets a delay threshold of an uplink sending buffer for a radio bearer, and when the waiting time of the queue head data in the uplink sending buffer reaches the delay threshold of the uplink sending buffer, the terminal considers that the data is a BSR trigger event or
The terminal configures a pointer for each uplink transmission buffer, wherein the pointer is used for indicating the position of reported data in the corresponding buffer, and when unreported data exists in the uplink transmission buffer with the highest priority in the terminal or all data with the highest priority in waiting data of all uplink transmission buffers are unreported data, the uplink transmission buffer is considered to be a BSR triggering event;
the terminal generates a BSR and sends the BSR to a base station.
2. The method according to claim 1, wherein the sending, by the terminal, the BSR to the base station specifically is:
and the terminal sends the BSR to the base station in an uplink subframe with enough authorized resources.
3. The method of claim 1, further comprising:
and the terminal sends a scheduling request to the base station, and after obtaining the uplink authorization, the terminal generates a BSR and sends the BSR to the base station.
4. The method of claim 1,
the lower the sensitivity of the radio bearer corresponding to the uplink transmission buffer to the packet loss rate is, the larger the occupancy rate threshold of the uplink transmission buffer is;
the higher the sensitivity of the radio bearer corresponding to the uplink transmission buffer to the packet loss rate, the smaller the occupancy rate threshold of the uplink transmission buffer.
5. The method of claim 1,
the lower the sensitivity of the radio bearer corresponding to the uplink transmission buffer to the time delay, the larger the time delay threshold of the uplink transmission buffer is;
the higher the sensitivity of the radio bearer corresponding to the uplink transmission buffer to the time delay, the smaller the time delay threshold when the uplink transmission buffer is used.
6. The method of claim 1, further comprising:
when the terminal configures a pointer for each uplink transmission buffer area, the pointer points to the starting position of the corresponding uplink transmission buffer area;
when the terminal generates BSR, each pointer is moved to the last position of reported data in the corresponding uplink transmission buffer;
when all the reported data in the uplink sending buffer area are moved out of the buffer area, corresponding pointers point to the starting position of the buffer area;
and if the BSR report fails, pointing the pointer of each buffer to the position pointed by each pointer before the BSR report.
7. The method of claim 1, further comprising:
when data enters or moves out of the uplink sending buffer, the terminal checks whether waiting data exists in all the uplink sending buffers according to the priority of the uplink sending buffer from high to low.
8. The method of claim 7,
waiting data exists in an uplink sending buffer area, and a pointer corresponding to the uplink sending buffer area is located at the starting position of the uplink sending buffer area, so that all data with the highest priority in the waiting data are considered to be unreported data;
9. the method of claim 8,
and if other uplink sending buffers exist in the terminal and have the same priority A as the uplink sending buffer, and the pointers corresponding to the other buffers with the priority A are all located at the starting positions of the other uplink sending buffers, all the data with the highest priority in the waiting data are considered to be unreported data.
10. The method of claim 1,
when the terminal obtains the uplink authorized resource, the uplink sending buffer with the highest priority has unreported data, and the data in the buffer cannot be sent at one time, the uplink sending buffer with the highest priority in the terminal is considered to have unreported data.
11. An apparatus, comprising:
a trigger condition setting unit for setting a threshold;
the buffer status report BSR triggering unit is used for triggering the BSR generation and sending unit when the triggering condition is determined to be met;
a BSR generation and transmission unit, configured to generate a BSR according to the trigger of the BSR trigger unit, and transmit the BSR to a base station; wherein:
the trigger condition setting unit is specifically configured to set an occupancy rate threshold of an uplink transmission buffer for a radio bearer, and the BSR trigger unit is specifically configured to trigger a BSR generation and transmission unit when an actual occupancy rate of the uplink transmission buffer reaches the occupancy rate threshold of the uplink transmission buffer; or,
the trigger condition setting unit is specifically configured to set an uplink transmission buffer delay threshold for a radio bearer, and the BSR trigger unit is specifically configured to trigger a BSR generation transmitting unit when a waiting time for uplink transmission of queue head data in a buffer reaches the uplink transmission buffer delay threshold; or,
the trigger condition setting unit is specifically configured to configure a pointer for each uplink transmission buffer, where the pointer is used to indicate a position of reported data in a corresponding buffer, and the BSR trigger unit is specifically configured to trigger the BSR generation and transmission unit when there is unreported data in the uplink transmission buffer with the highest priority or all data with the highest priority in waiting data of all uplink transmission buffers are unreported data.
12. The apparatus of claim 11, further comprising:
and the uplink authorization unit is used for sending the scheduling request to the base station and receiving the uplink authorization.
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| CN2008100651543A CN101483918B (en) | 2008-01-08 | 2008-01-08 | Buffer condition report sending method and apparatus thereof |
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| CN101483918A (en) | 2009-07-15 |
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