CN101695194A - Multiplexing method for dispatching middle uplink logic channel in semi-static state by LTE systecm - Google Patents

Abstract

A multiplexin method for dispatching middle uplink logic channel in semi-static state of an LTE system comprises sending semi-static data by user UE on semi-static dispatching resources assigned on a base station, and data whose priority is higher than semi-static data on the semi-static dispatching resources are to be sent when the cycle of semi-static dispatching transmission reaches, UE generates conventional buffer state report BSR of high-priority data, the transmission of dispatching request SR is triggered when judging that residual resources after semi-static dispatching resources fill in semi-static data are insufficient for sending BSR and only semi-static dispatching resources exist. The embodiment of the invention can avoid increasing data transmission time delay and segmented overhead for semi-static dispatching.

Description

A method for multiplexing uplink logical channels in LTE system semi-persistent scheduling

technical field

The present invention relates to the technical field of mobile communication, and more specifically, relates to a method for multiplexing uplink logical channels in semi-persistent scheduling of an LTE system.

Background technique

In order to meet the challenges of broadband access technology and meet the requirements of new services, the international standardization organization 3GPP started its long-term evolution (LTE) technology standardization work at the end of 2004. The LTE system adopts downlink Orthogonal Frequency Division Multiple Access (OFDMA) and uplink Single Carrier Frequency Division Multiple Access (SC-FDMA) access methods, and introduces multiple-input multiple-output (MIMO) technology to greatly improve transmission It can effectively resist multi-path interference, and can flexibly configure different bandwidths. In the case of 20M bandwidth, the target reaches the peak transmission rate of uplink 50Mbps and downlink 100Mbps. The evolution goal of LTE is an all-IP communication network, which can support rich multimedia, VoIP (Voice over IP), data download and other services. Among them, VoIP is a characteristic service mainly promoted by the LTE system.

LTE is characterized by high speed, and VoIP service is a low-speed service, but the characteristic of VoIP service is that the arrival time of data is relatively uniform and fixed. For special services such as VoIP, the LTE system uses a scheduling method that is not available in previous communication systems - a semi-static scheduling method to control the transmission of such services.

Semi-persistent scheduling refers to a semi-statically configured transmission cycle, and after one scheduling, the user UE performs semi-static data transmission and reception according to the configured cycle and initially scheduled resources. If semi-persistent scheduling is used to transmit VoIP services, the default semi-persistent scheduling transmission period for uplink transmission is 20ms. If the initial service scheduling is on resource number n, UE will send on resource n every 20ms.

When the transmission cycle of semi-static scheduling arrives, if there is data that needs to be transmitted on the UE side with a higher priority than the currently transmitted semi-static data, according to the multiplexing process of the uplink logical channel stipulated in the current 3GPP protocol, the current available resources are prioritized for transmission. The high-priority data triggers the regular buffer status report BSR and its data, and then the base station obtains the information of the BSR and makes a scheduling response.

Figure 1 is a method for multiplexing uplink logical channels in semi-persistent scheduling in the prior art. When the semi-persistent scheduling resource is performing semi-persistent data transmission, the higher priority data in Figure 1 arrives during the semi-persistent scheduling transmission period, and the medium access control MAC layer of the UE generates a regular BSR and transmits it in the semi-persistent scheduling resource. report, and higher priority data will be transmitted first. BSR and higher-priority data will occupy semi-persistent scheduling resources, resulting in the amount of currently transmitted data being greater than the carrying capacity of the remaining semi-persistent scheduling resources, resulting in more data segmentation and causing the radio link control RLC layer. For example, in FIG. 1, a semi-static data packet is divided into two semi-static data segments. One part is sent on semi-statically scheduled resources, and the other part is dynamically scheduled to be sent. However, the semi-static data sent by dynamic scheduling requires the base station to schedule resources to send, and the delay caused by data segmentation increases accordingly. In addition, the data rate of semi-persistent scheduling itself is low, and more data segments require more overhead than data without segments, because each segment of data needs to add a header to transmit the segment of data. Correspondingly, the more data is divided, the more segmentation overhead is required.

After receiving the BSR of the service with higher priority, the base station uses dynamic scheduling to schedule data transmission. Since higher-priority data has occupied semi-persistent scheduling resources to complete transmission, the semi-static data that should have been sent in the semi-persistent scheduling period is segmented and transmitted on dynamically scheduled resources because the semi-persistent scheduling resources are occupied. However, for the segmented semi-static data, the reception delay from the physical layer to the RLC layer at the base station at the receiving end will increase, resulting in an increase in data transmission delay.

Contents of the invention

The embodiment of the present invention proposes a method for multiplexing uplink logical channels in the semi-persistent scheduling of the LTE system, so as to avoid increasing the data transmission delay and segmentation overhead of the semi-persistent scheduling.

The technical scheme of the embodiment of the present invention is as follows:

(After the claim is confirmed, just copy it directly)

It can be seen from the above technical solutions that in the embodiment of the present invention, the UE sends semi-static data on the semi-static scheduling resources allocated by the base station; There is data with a higher priority than the semi-static data waiting to be sent, and the UE generates a BSR for the high-priority data, and judges that the remaining resources after the semi-static scheduling resources are filled with semi-static data are not enough to send a BSR, and only half When resources are statically scheduled, the sending of a scheduling request SR is triggered. Avoids the segmentation of semi-static data, thereby reducing the data transmission delay and segmentation overhead of semi-static scheduling

Description of drawings

FIG. 1 is a schematic diagram of a method for multiplexing uplink logical channels in semi-persistent scheduling in the prior art;

FIG. 2 is a schematic diagram of an uplink logical channel multiplexing method in semi-persistent scheduling of an LTE system according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

In the uplink transmission of the LTE system, the UE multiplexes each logical channel and limits the content of data transmission on semi-persistent scheduling resources. Arranged according to the priority of the logical channel, while assigning the transmission sequence, it ensures the normal transmission of semi-static data and reduces data transmission delay and segmentation overhead.

In the existing LTE standard, in the uplink logical channel multiplexing process, the leaky bucket (Token Bucket) algorithm is used to perform priority processing and transmission bit number control among multiple logical channels of the same user, and the control plane (RRC) The layer will configure a priority value for each logical channel, a priority bit rate (PBR) and a leaky bucket size duration (BSD) to control the multiplexing between uplink logical channels, and the priority guarantee configuration is higher Data transmission of the logical channel.

The LTE protocol stipulates that among each logical channel and the media access control (MAC) control unit, the priority order of various data is from high to low:

1. A MAC control element including a cell radio network temporary identifier (C-RNTI) or data of an uplink UL-CCCH channel.

2. Other BSR MAC control elements except filling BSR.

3. Power Space Reporting Media Access Control (PHR MAC) control unit.

4. Data of other logical channels except the uplink UL-CCCH channel.

5. Other MAC control elements including filling the BSR.

In the embodiment of the present invention, when the UE is activated for semi-persistent data transmission for the first time, it records the logical channel number currently scheduled for transmission and the size of the semi-persistent scheduling resource allocated by the base station. When the period of semi-persistent scheduling transmission arrives, only apply for semi-static data from the logical channel corresponding to the recorded logical channel number.

When the period of semi-persistent scheduling transmission arrives, when there is data with a higher priority than semi-static data waiting to be sent, the MAC layer of the UE generates a BSR for higher priority data. From the size of the semi-persistent scheduling resources recorded by the UE and the transmitted semi-persistent scheduling data, it is judged that the semi-persistent scheduling resources filled with semi-static data are not enough to send the BSR of higher priority data, and the UE has only semi-persistent scheduling resources at this time. Then there is no need to consider the priority of the data to be sent. Semi-persistent scheduling resources are preferentially used for the transmission of semi-persistent data. Of course, if it is judged that the semi-persistent scheduling resource is just filled with semi-static data, at this time, the semi-persistent scheduling resource has no resources to send the BSR of high-priority data, and the UE only has the semi-persistent scheduling resource at this time, and there is no need to consider the same The priority of sending data. When judging that the remaining resources after the semi-static scheduling resources are filled with semi-static data are sufficient to send the BSR, then using the remaining resources after filling the semi-static data to send the BSR, which also includes: judging the semi-persistent scheduling resources In the case that the remaining resources filled with semi-static data are just used to send the BSR, the remaining resources filled with semi-static data are also used to send the BSR.

The UE sends a scheduling request SR in the uplink control channel PUCCH, requesting the base station to allocate resources to send high-priority data. In the LTE system, data is transmitted on the uplink shared channel PUSCH, and SR is transmitted on the PUCCH. The transmission of SR in PUCCH will not affect the transmission of semi-static data in PUSCH.

In Figure 2, when the initial activation occurs, the semi-static scheduling transmission cycle arrives, and the logical channel data corresponding to the transmitted logical channel is recorded; when the semi-static scheduling transmission cycle arrives, if data with a higher priority than the semi-static data arrives, it is determined that the transmission The semi-persistent scheduling resource after the semi-static data is not enough to send the BSR of high-priority data, and the UE only has semi-persistent scheduling resources. For the BSR of high-priority data, it is considered that there is no available uplink resource to transmit the BSR, then the PUCCH Send a scheduling request SR, requesting the base station to allocate resources to send high-priority data. The semi-static data in the logical channel corresponding to the recorded logical channel number is sent on the only semi-static resource of the UE. The UE receives scheduling resources from the base station, and dynamically schedules and sends BSR and high-priority data. It realizes the transmission of semi-static data on semi-static resources, and sends BSR and high-priority data on dynamic scheduling resources, thereby avoiding the increase of data transmission delay and segmentation overhead of semi-static scheduling.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. a method for multiplexing uplink logical channels in LTE system semi-persistent scheduling, characterized in that the method comprises: The user UE sends semi-static data on the semi-static scheduling resources allocated by the base station; When the semi-persistently scheduled transmission period arrives, there is data with a higher priority than semi-static data waiting to be sent on the semi-persistently scheduled resource, and the UE generates a regular buffer status report BSR for the high-priority data, and judges that the semi-persistently After the static scheduling resources are filled with semi-static data, the remaining resources are not enough to send BSR, and when there are only semi-static scheduling resources, the sending of a scheduling request SR is triggered. 2. according to the multiplexing method of uplink logical channel in the semi-persistent scheduling of the LTE system of claim 1, it is characterized in that, The sending of semi-static data by the UE on the semi-persistent scheduling resources allocated by the base station specifically includes: When the UE is activated for semi-persistent scheduled transmission for the first time, it records the logical channel number currently required for semi-persistent transmission; When the period of each semi-persistent scheduled transmission arrives, only apply for semi-static data from the logical channel corresponding to the logical channel number. 3. according to the multiplexing method of uplink logic channel in the described LTE system semi-persistent scheduling of claim 1 or 2, it is characterized in that, The judging that the remaining resource after the semi-persistent scheduling resource is filled with semi-static data is not enough to send a BSR further includes that the semi-persistent scheduling resource is just filled with semi-static data. 4. The method for multiplexing uplink logical channels in the semi-persistent scheduling of the LTE system according to claim 1 or 2, further comprising, judging that the remaining resources after the semi-persistent scheduling resources are filled with semi-static data are sufficient to send BSR , the BSR is sent using the remaining resources filled with semi-static data. 5. The method for multiplexing uplink logical channels in the semi-persistent scheduling of the LTE system according to claim 4, wherein the judging that the remaining resources after the semi-persistent scheduling resource is filled with semi-static data is sufficient to send a BSR further comprises, It is judged that the remaining resource after the semi-persistent scheduling resource is filled with semi-persistent data just sends a BSR.

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