KR101068650B1 - Method and apparatus of transmission time interval bundling management - Google Patents

Abstract

A method for managing transmission time interval bundling transmissions at a user equipment of a wireless communication system includes forming a plurality of packets to be transmitted and the plurality of at the network end of the wireless communication system. Selecting a fixed time interval or a dynamic time interval for repeatedly transmitting each packet of the number of packets.

Description

Method and apparatus of transmission time interval bundling management

Cross Reference to Related Application

This application is filed on April 1, 2008, which is incorporated herein by reference in its entirety with the name "Multiple HARQ transmissions and DRX short cycle timer" incorporated herein by reference in its entirety. Claims priority to number 61 / 041,250.

The present invention relates to a transmission time interval bundling transmission management method and apparatus in a wireless communication system, and more particularly, to a method and apparatus for performing transmission time interval bundling transmission using two transmission methods in a wireless communication system.

Long-Term Evolution (LTE) system, an advanced high-speed wireless communication system established on 3G mobile telecommunications systems, supports only packet-switched transmission, and supports Node B and RNC (wireless networks). Medium Access Control (MAC) layer and Radio Link Control (RLC) in one single communication site, as in the case of implementation only on Node B rather than on each controller, Radio Network Controller. All layers are implemented, thus simplifying the system structure.

In LTE, a transmission time interval (TTI) bundling technique is introduced to improve uplink coverage according to the prior art. TTI bundling is performed by repeatedly transmitting the same packet with a default time, and such repeatedly transmitted packets are called bundles. UEs within cell boundaries using TTI bundling improve LTE uplink coverage by reducing transmission delay and signaling of control channels to improve transmission reliability and accuracy.

Looking at the TTI bundling technique, the prior art does not solve the problem of related transmission patterns, which may cause transmission delay and waste of radio resources.

It is therefore an object of the present invention to provide a method and apparatus for managing transmission time interval bundling transmissions in a wireless communication system.

The present invention discloses a method for managing transmission time interval bundling transmissions at a user equipment of a wireless communication system, the method comprising forming a plurality of packets to be transmitted and a network of the wireless communication system Selecting a fixed time interval or a dynamic time interval for repeatedly transmitting each packet of the plurality of packets to a network end.

The present invention also discloses a communication device for managing transmission time interval bundling transmissions in user equipment of a wireless communication system, the device being coupled to a processor and to the processor to execute a predetermined process. And a storage device for storing a program for executing the process. This process includes forming a plurality of packets to be transmitted and selecting a fixed time interval or a dynamic time interval for repeatedly transmitting each packet of the plurality of packets to a network end of the wireless communication system. It is characterized by.

The present invention provides a method and apparatus for managing transmission time interval bundling transmission in a wireless communication system.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Referring to FIG. 1, FIG. 1 is a diagram conceptually illustrating a wireless communication system 1000. The wireless communication system 1000 is preferably a long-term evolution communication system and is simply composed of one network terminal and a plurality of user equipments. In FIG. 1, network terminals and user equipment are only used to illustrate the structure of the wireless communication system 1000. In practice, the network terminal may include a plurality of evolved base stations (eNBs) and evolved UMTS radio access networks (EUTRANs), etc., depending on actual needs, and the user equipment (UE) may be a mobile telephone. Devices, such as computer systems and the like.

Referring to FIG. 2, FIG. 2 is a functional block diagram of a wireless communication device 100. Communication device 100 may be used to implement a UE in FIG. For simplicity, FIG. 2 shows only the input device 102, the output device 104, the control circuit 106, the central processing unit (CPU) 108, the memory 110, and the program 112 of the communication device 100. And only the transceiver 114. In the communication device 100, the control circuit 106 executes the program 112 in the memory 110 via the CPU 108, thereby controlling the operation of the communication device 100. The communication device 100 may receive signals input by a user through an input device 102 such as a keyboard, and may output an image or sound through an output device 104 such as a monitor or a speaker. The transceiver 114 is used to receive and transmit wireless signals, deliver the received signals to the control circuit 106, and wirelessly output the signals generated by the control circuit 106. From the point of view of the communication protocol framework, the transceiver 114 may be considered to be part of Layer 1, and the control circuit 106 may be used to implement the functions of Layer 2 and Layer 3.

With continued reference to FIG. 3, FIG. 3 is a conceptual diagram of the program 112 shown in FIG. Program 112 includes an application layer 200, layer 3 202 and layer 2 206, and is coupled to layer 1 218. Layer 3 (202) performs radio resource control. Layer 2 206 includes an RLC layer and a MAC layer, and performs link control. Layer 1 218 performs the physical connection.

In LTE, the MAC layer of Layer 2 206 may perform transmission time interval (TTI) bundling functionality to improve the reliability and precision of transmission, thereby improving uplink coverage. In such an environment, when TTI bundling is configured by the UE, an embodiment of the present invention provides TTI bundling management program code 220 for managing TTI bundling transmissions.

Referring to FIG. 4, FIG. 4 is a flow diagram of a process 40 in accordance with one embodiment of the present invention. Process 40 may be used to manage TTI bundling transmissions for a UE in wireless communication system 1000 and may be compiled into TTI bundling management program code 220. Process 40 includes the following steps.

Step 400: Start

Step 402: form a plurality of packets to be transmitted

Step 404: Select a fixed time interval or dynamic time interval for repeatedly transmitting each packet of the plurality of packets to the network end of the wireless communication system.

Step 406: Exit

According to process 40, when performing TTI bundling transmission, one embodiment of the present invention selects a fixed time interval or a dynamic time interval to transmit each packet repeatedly. In short, in one embodiment of the present invention, the UE repeatedly transmits each packet using a fixed time interval or a dynamic time interval.

In detail, when focusing on one of the packets, the UE forms a plurality of sub-packets corresponding to the packet. Each of the sub-packets may be the same as the packet or may be somewhat different from the packet because of operations such as coding, but the essence of the sub-packets is the same after the packet is decoded. Later on, focusing on all packets, the UE selects a fixed time interval or a dynamic time interval to transmit each packet repeatedly, ie, transmits sub-packets of all packets to the network end. 5 and 6 are conceptual diagrams illustrating the operation of TTI bundling using fixed time intervals and dynamic time intervals, respectively.

In FIG. 5, assuming that the time interval is T and the packets to be transmitted are P1, P2 and P3, and each bundle consists of two packets, each packet is transmitted twice. First, the UE converts packets P1, P2 and P3 into sub-packets P1_1, P1_2, P2_1, P2_2, P3_1 and P3_2 in order, and each sub-packet may be the same or somewhat different from the corresponding packet. The UE then transmits each sub-packet continuously, i.e., after the UE transmits sub-packets P1_1 and P1_2 at time point 2T, the UE continues to transmit sub-packets P2_1 and P2_2. In other words, in FIG. 5, the UE always transmits one bundle during each of two time intervals (0T-2T, 2T-4T, etc.), which means that the fixed time interval corresponds to the number of transmissions of each packet. In this case, if a transmission delay or packet loss occurs, whereby the UE cannot repeatedly transmit the packet, the UE waits to transmit the packet until the next fixed time interval. For example, between time points 4T and 5T, the UE cannot transmit sub-packets P3_1 and P3_2, in which case the UE waits for the next fixed time interval (which is between time points 6T and 7T) to send packet P3. Send repeatedly.

In comparison, as shown in FIG. 6, the UE repeatedly transmits packets P1, P2 and P3 using dynamic time intervals, ie, iteratively transmits sub-packets P1_1, P1_2, P2_1, P2_2, P3_1 and P3_2. Send. Therefore, if the UE does not transmit sub-packets P2_1 and P2_2 corresponding to packet P2 between time points 2T and 3T, the UE may immediately transmit sub-packets P2_1 and P2_2 in subsequent time intervals 3T-4T. Similarly, if packet P3 is not transmitted immediately following packet P2 and there is a gap between them, the UE can immediately transmit sub-packets P3_1 and P3_2 after packet P3 is formed.

5 and 6 illustrate the difference between the operation of fixed time intervals and dynamic time intervals when two-time transmissions are configured. In fact, the number of repetitive transmissions is not limited to two, but may be a different value.

In addition, in the present invention, the fixed time interval may be regarded as a specific case of the dynamic time interval, and those skilled in the art may make modifications and changes according to different requirements.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art while maintaining the teaching of the present invention. I will understand the point. Accordingly, it should be understood that the foregoing disclosure is only limited by the scope and limitations of the appended claims.

The present invention can be applied to a transmission time interval bundling transmission management method and apparatus in a wireless communication system, and in particular, to a method and apparatus for performing transmission time interval bundling transmission using two transmission methods in a wireless communication system. have.

1 is a conceptual diagram of a wireless communication system.

2 is a functional block diagram of a wireless communication device.

3 is a conceptual diagram of the program shown in FIG.

4 is a flow diagram of a process according to one embodiment of the invention.

5 is a conceptual diagram for performing transmission time interval bundling using a fixed time interval, according to an embodiment of the present invention.

6 is a conceptual diagram for performing transmission time interval bundling using dynamic time intervals, in accordance with an embodiment of the present invention.

Claims (12)

A method for managing transmission time interval bundling transmissions in a user equipment of a wireless communication system, the method comprising: Forming a plurality of packets to be transmitted; And Selecting a fixed time interval or a dynamic time interval for repeatedly transmitting each packet of the plurality of packets to a network end of the wireless communication system, Wherein said fixed time interval corresponds to the number of repetitions of transmitting each packet of said plurality of packets. delete The method of claim 1, wherein repeatedly transmitting each packet of the plurality of packets to a network end of the wireless communication system, Forming a plurality of sub-packets corresponding to each packet of the plurality of packets; And Transmitting the plurality of sub-packets corresponding to each packet to the network end. The method of claim 3, And the plurality of sub-packets corresponding to each packet are identical. The method of claim 3, Wherein said plurality of sub-packets corresponding to each packet is different. The method of claim 1, And wherein said wireless communication system is a long-term evolution communication system. A communication apparatus for managing transmission time interval bundling transmissions in a user equipment of a wireless communication system, A processor for executing a predetermined process; And A storage device coupled to the processor for storing a program for executing the process, wherein the process includes: Forming a plurality of packets to be transmitted; And Selecting a fixed time interval or a dynamic time interval for repeatedly transmitting each packet of the plurality of packets to a network end of the wireless communication system, Wherein said fixed time interval corresponds to the number of repetitions of transmitting each packet of said plurality of packets. delete 8. The method of claim 7, wherein repeatedly transmitting each packet of the plurality of packets to a network end of the wireless communication system during the process includes: Forming a plurality of sub-packets corresponding to each packet of the plurality of packets; And Transmitting said plurality of sub-packets corresponding to each packet to said network end. 10. The method of claim 9, And the plurality of sub-packets corresponding to each packet are identical. 10. The method of claim 9, And the plurality of sub-packets corresponding to each packet is different. The method of claim 7, wherein And wherein said wireless communication system is a long-term evolution communication system.

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