CN1777080B - Transmission method of MAC-e signaling - Google Patents

Abstract

A method for transmitting MAC-e signaling, comprising steps: RNC configures QoS attributes for MAC-e signaling, and notifies UE; when UE performs data transmission, if MAC-e PDU contains MAC-e signaling information , the UE determines the QoS of the entire MAC-ePDU according to the QoS of the MAC-e signaling and the QoS attribute of the data; the UE determines the transmit power of the MAC-e PDU according to the determined QoS, so as to transmit the MAC-e PDU. In the present invention, when MAC-e Signaling is included in the MAC-e PDU, the UE can accurately determine the QoS attribute of the entire MAC-e PDU according to the needs of MAC-e Signaling, so that the transmission power can be used reasonably and effectively Transmit MAC-e Signalling.

Description

Transmission method of MAC-e signaling

technical field

The invention relates to the third generation of mobile communication, in particular to a method for transmitting MAC-e signaling.

Background technique

The second generation mobile communication system includes GSM (Global System for Mobile Communications) and IS (Interim Standard)-95, the main goal is to provide voice services. GSM adopts TDMA (Time Division Multiple Access) technology, which was commercialized in 1992 and is mainly used in Europe and China. What IS-95 uses is code division multiple access technology, mainly used in the United States and South Korea.

At present, mobile communication technology has evolved into the third generation mobile communication system, which provides high-speed and high-quality data services and multimedia services in addition to voice services. The third-generation mobile communication system includes the asynchronous CDMA system (or WCDMA system, or UMTS) studied by the 3GPP ( ^3rd Generation Project Partnership) International Organization for Standardization, that is, the timing between the base stations is asynchronous, and 3GPP2 (3rd ^Generation Project Partnership) Generation Project Partnership 2) The synchronous CDMA system (or CDMA2000) studied by the International Organization for Standardization, that is, the timing between the base stations is the same.

Both synchronous and asynchronous third-generation mobile communication systems are standardizing on providing high-speed, high-quality data packet services. For example: 3GPP has standardized HSDPA (High Speed Downlink Access) to increase the downlink data rate, and 3GPP2 is also standardizing 1xEV-DV (Evolution-Data and Voice). 3GPP continues to enhance the transmission of uplink packet data (EUDCH), so as to improve the capacity and coverage of uplink. Compared with the uplink DCH of Rel99/4/5, EUDCH has introduced the HARQ (Hybrid Automatic Repeat Request) mechanism, and is considering using a shorter TTI (transmission time interval) than the uplink DCH of Rel99/4/5, such as with HSDPA is the same as 2ms.

In order to support EUDCH, compared with the specification of WCDMA system R99, some new channels have been added. The newly added transport channel is called E-DCH, and the services supported by EUDCH will be mapped to this transport channel. The newly added physical channels are Enhanced Dedicated Physical Data Channel (E-DPDCH) and Enhanced Dedicated Physical Control Channel (E-DPCCH). Figure 4 shows the types of all physical channels after the EUDCH is introduced. It includes the Dedicated Physical Control Channel (DPCCH) in Rel99, the Dedicated Physical Data Channel (DPDCH), and the uplink dedicated physical control channel HS-DPCCH for HSDPA in Rel5, and the addition of E-DPDCH and E-DPCCH after the introduction of EUDCH . E-DPDCH is used to transmit data from E-DCH transport channel, while E-DPCCH transmits control information for E-DPDCH decoding, such as E-TFI (size and transmission format of data packet), scheduling information, HARQ information (such as receiving the serial number RSN) and so on.

Similar to HSDPA, in order to support the introduced HARQ technology, EUDCH also adds a new entity in the MAC layer, see Figure 1. In UE and Node B, the new MAC entity is called MAC-e, and the entity added on RNC is called MAC-es. The channel between MAC-e and the physical layer is the newly defined E-DCH transmission channel, and the data packet in E-DCH is called MAC-e PDU. The channel between MAC-e and MAC-d entities is MAC-d Flow, and the data packets transmitted in MAC-d Flow are MAC-d PDUs.

The main function of the UE-side MAC-e entity is to determine the size of the MAC-e PDU to be sent according to the scheduling command of the Node B and the current available transmit power of the UE, and then select an appropriate number of MAC-d PDUs to load into the In a MAC-e PDU, it is handed over to the physical layer for data transmission. Another main function is to decide whether to retransmit the previously sent MAC-e PDU according to the feedback from the Node B, the QoS requirements of the MAC-e PDU, etc., that is, the function of HARQ. While sending data, some status information about the UE will also be encapsulated in the MAC-e PDU along with the MAC-d PDU. The status information about the UE includes the currently available transmit power, the amount of data to be sent in the memory, etc., which are very useful reference information for Node B scheduling. Since this information is transmitted through MAC-e PDU and terminated at the MAC layer of Node B, it is called MAC-e signaling (hereinafter referred to as MAC-eSignalling). The main function of the MAC-e entity of Node B is to generate ACK/NACK according to whether the MAC-ePDU sent to the UE is successfully received or not. If the MAC-e PDU is successfully received, analyze the MAC-e Signaling information in it, schedule the data rate of the UE (generate a scheduling command), and send the data except the MAC-e Signaling and padding bits in the MAC-e Payload to the RNC. The main function of the MAC-es entity of the RNC is to sort the received data.

The structure of MAC-e PDU is shown in Figure 2. A MAC-e PDU includes two parts: MAC-e Header and MAC-ePayload. MAC-e Header indicates the data structure of the following MAC-e Payload. MAC-e Payload consists of MAC-e Signalling, one or more MAC-d PDUs, and some padding bits (Padding). MAC-e Signaling is the aforementioned UE status information that is useful for Node B scheduling. But not every MAC-e PDU contains MAC-eSignalling, it only transmits when needed according to scheduling needs. The MAC-e Header can indicate whether the MAC-e Payload contains MAC-e Signaling information. MAC-d PDU is the main content of MAC-e Payload, which is a packet from some MAC-d Flow. The padding bits are only used for padding when all the previous information cannot constitute the length of a specified MAC-ePDU. It can also be seen from Figure 2 that MAC-dPDUs with different QoS attributes can be encapsulated in the same MAC-e PDU. Just because the MAC-e PDU may contain MAC-d PDUs with different QoS attributes, there must be a method to determine the QoS attributes of the entire MAC-e PDU.

At present, 3GPP already has a method to determine the QoS attribute of MAC-e PDU, but this method does not consider the situation that MAC-e Signaling is included in MAC-e PDU. The specific description of this method is: when a MAC-e PDU only contains a MAC-d PDU with one QoS attribute, the QoS is the QoS of the entire MAC-e PDU; when a MAC-e PDU contains multiple QoS attributes For different MAC-dPDUs, the QoS of the entire MAC-e PDU is the QoS of all MAC-d PDUs, requiring the strictest QoS. The QoS mentioned here mainly includes two attributes, one is the power offset (PO for short), and the other is the maximum number of retransmissions. UTRAN configures QoS attributes for each MAC-d Flow. The QoS of a MAC-d PDU is the QoS attribute of the MAC-d Flow to which it belongs. That is to say, when a MAC-e PDU contains multiple MAC-d PDUs with different QoS attributes, the PO of the entire MAC-ePDU determined by the UE is the largest PO value among all MAC-d PDUs. The maximum number of retransmissions of the entire MAC-e PDU is the maximum value of the maximum number of retransmissions corresponding to all MAC-d PDUs.

After the QoS attribute of a MAC-e PDU is determined, the UE can determine the transmission power when transmitting the data packet according to the QoS (mainly the power offset PO) and other information. The specific method is: the network configures in advance the gain factor β (power ratio of E-DPDCH/DPCCH) corresponding to each E-TFI under the reference QoS, and the power offset PO between each QoS and the reference QoS. The UE first determines the transmit power of the MAC-e PDU according to the gain factor corresponding to the E-TFI of the MAC-e PDU, and then adjusts the transmit power according to the power offset PO between the QoS of the MAC-e PDU and the reference QoS attribute. Make corrections to finally determine the transmit power of the MAC-e PDU.

From the above description, it can be seen that the current 3GPP does not consider the MAC-e Signaling included in the MAC-e PDU when determining the QoS attribute of the MAC-e PDU. However, the information carried in MAC-eSignalling is necessary for scheduling, so the QoS attribute of MAC-e Signaling must also be considered when determining the QoS attribute of MAC-e PDU. Currently, the uplink scheduling information includes rate increase request, sending power, amount of data to be sent in the memory, and the like. Since the information is used for Node B scheduling, and the Node B itself only has the MAC layer and the physical layer, it is impossible for these information to be transmitted on the layer above the MAC. Since the number of bits required for this information is relatively large, and it is not information that needs to be transmitted in every frame, at present, 3GPP basically prefers that the rate increase request (Rate Request, only one bit) is defined in the frame structure of the physical layer , the other two kinds of information are transmitted in MAC-e Signalling.

Due to the nature of the content transmitted in MAC-e Signaling, it is determined that it must be transmitted from the UE to the Node B as soon as possible, and it is meaningless to reach the Node B after a large transmission delay. If the MAC-e Signaling is not considered when determining the QoS attribute of the MAC-e PDU, such a problem may occur: the transmission delay requirement of the MAC-e PDU where the MAC-e Signaling is located is very low, and the MAC -e The transmission power of the PDU is relatively small, resulting in the successful reception of the data packet after multiple retransmissions. At this time, the information in MAC-e Signaling is invalid, because at this time, the transmit power of the UE or the amount of data to be sent in the memory has changed.

Contents of the invention

The purpose of the present invention is to provide a method for transmitting MAC-e signaling.

In order to achieve the above object, a transmission method of MAC-e signaling, comprising steps:

1) The RNC configures the QoS attribute for the MAC-e signaling and notifies the UE;

2) When MAC-e PDU contains only MAC-e signaling but no data, the QoS of MAC-e signaling is the QoS of MAC-e PDU, or when MAC-e PDU contains both MAC-e signaling and For data, the QoS of the entire MAC-e PDU is determined by the QoS of the data part;

3) The UE determines the transmission power of the MAC-e PDU according to the determined QoS, so as to transmit the MAC-e PDU.

In the present invention, when MAC-e Signaling is included in the MAC-e PDU, the UE can accurately determine the QoS attribute of the entire MAC-e PDU according to the needs of MAC-e Signaling, so that the transmission power can be used reasonably and effectively Transmit MAC-e Signalling.

Description of drawings

FIG. 1 is a schematic diagram of a newly added MAC entity of EUDCH;

Figure 2 is a structural diagram of the MAC-e PDU;

Figure 3 is the PayLoad part of the MAC-e PDU containing multiple MAC-d Flow;

Fig. 4 is the physical channel of EUDCH.

Detailed ways

The basic principle of the present invention is that when the MAC-e PDU contains MAC-e signaling, the UE can accurately determine the QoS attribute of the entire MAC-e PDU according to the needs of the MAC-e signaling, so that it can reasonably use the transmission power, to effectively transmit MAC-e signaling.

In the present invention, the term "base station" has the same meaning as the word "Cell" in the 3GPP English specification.

The present invention comprises following content:

The RNC configures the QoS attribute for the MAC-e signaling, and notifies the UE of the attribute.

When the UE is transmitting data, if the MAC-e PDU contains MAC-e signaling, the QoS of the MAC-e signaling should be considered when determining the QoS of the entire MAC-e PDU, and then the MAC-e signaling is determined according to the determined QoS. e PDU transmission power, so as to perform MAC-e PDU transmission.

The UE determines whether to end the transmission of the MAC-e signaling based on the confirmation information of the base station for the MAC-e PDU and other information.

The following describes in detail that the RNC configures the QoS attribute for the MAC-e signaling and notifies the UE of the attribute.

The parameters included in the QoS attribute are power offset (PO) and maximum number of retransmissions.

The size of the power offset PO in QoS is determined by the network and notified to the UE through RRC signaling or system information broadcasting. If the Node B needs this information, it can notify the Node B through the Iub/Iur interface signaling.

As for the maximum number of retransmissions in QoS, there are two methods: 1) not configuring the maximum number of retransmissions for MAC-e signaling; 2) configuring a fixed value for MAC-e signaling.

When method 1 is used, that is, when the maximum number of retransmissions is not configured for MAC-e signaling, the maximum number of retransmissions of MAC-e signaling is 0, that is, the maximum number of retransmissions of the entire MAC-e PDU is determined by the data part, but The number of transmissions of MAC-e signaling is not limited by the maximum number of retransmissions of MAC-e PDUs. That is, the (re)transmission of the MAC-e signaling can continue until it is successfully received or the content of the MAC-e signaling changes, and the transmission of the MAC-e signaling is abandoned.

When using method 2, that is, configuring a fixed value for the maximum number of retransmissions of MAC-e signaling, the fixed value can be determined by UTRAN and notified to UE and Node B (if required by Node B); it can also be specified in the standard specified.

In order to facilitate the description of how the UE considers the QoS of MAC-e signaling when determining the QoS of the MAC-e PDU, first classify the cases where MAC-e signaling is included in the MAC-e PDU: Situation 1) There is only MAC in the MAC-e PDU -e signaling, no other data; case 2) MAC-e PDU contains data and MAC-e signaling at the same time, the length of MAC-e signaling is relatively large, and the frequency of transmission is not frequent, it can be called " MAC-e signaling with large length but low frequency". For example, the report of Buffer status in all priority queues may be transmitted once every 200 milliseconds, but each time there will be dozens or even hundreds of bits of information; case 3) MAC-e PDU contains both data and MAC-e information Therefore, the length of the MAC-e signaling is relatively small, but the transmission frequency is relatively high, which can be called "short length but high frequency" MAC-e signaling. For example, a one-bit RR (Rate Request) is transmitted every TTI or every two or three TTIs.

In the following, how the UE determines the QoS of the MAC-ePDU is described respectively for the above three situations.

In case 1, when the UE is transmitting a MAC-e PDU, the QoS of the MAC-e signaling is the QoS of the entire MAC-e PDU, that is, the power offset PO of the MAC-e signaling will be used for the MAC-e e PDU power adjustment.

In case 2 and 3, UE can have two methods to determine the QoS of MAC-e PDU. Method 1: No matter case 2 or case 3, the QoS of MAC-e PDU is determined by the data part. Method 2: For case 2, the QoS of MAC-e PDU is determined by both MAC-e signaling and data; for case 3, the QoS of MAC-e PDU is only determined by the data part.

The following describes whether the UE determines whether to end the transmission of the MAC-e signaling. The specific process is:

First, the UE determines the base station that must receive the MAC-e signaling, which is called "must receive base station" for the convenience of description. Then, put the MAC-e signaling into a MAC-e PDU for transmission, and process it as follows: 1) When the MAC-e PDU is not received by any base station and does not reach the maximum weight of the MAC-e PDU 2) When the MAC-e PDU is received by some (some) base stations, but not received by all the must-receive base stations, or the number of transmissions has reached the MAC-ePDU The maximum number of retransmissions, the data part in the MAC-e PDU does not need to be retransmitted, and the MAC-e signaling part needs to be retransmitted (that is, put the MAC-e signaling into the subsequent MAC-e PDU for transmission); 3) When the MAC-e PDU is successfully received by all the must-receive base stations, stop the transmission of the MAC-e signaling; 4) Before the MAC-e signaling is successfully received by all the must-receive base stations, the MAC-e signaling When the content changes, stop transmitting the old MAC-e signaling and start transmitting the updated MAC-e signaling.

For most MAC-e signaling, the must-receive base station is only the main dispatching base station (Serving Cell); for some special MAC-e signaling, the must-receive base station may include more than one base station.

Assuming that a UE has three MAC-d Flows with different QoS (see Figure 3), the POs of MAC-d Flows and MAC-e signaling are shown in Table 1.

Power offset PO MAC-d Flow1 PO1＝6 MAC-d Flow2 PO2=2

MAC-d Flow3 PO3=10 MAC-e signaling POs=15

Table 1

Because the QoS requirements of each MAC-d Flow and MAC-e signaling are different, four power offset POs are given in Table 1, corresponding to the QoS of three MAC-d Flow and MAC-e signaling Require.

In order to determine the transmit power of the MAC-e PDU, the system needs to configure the gain factors corresponding to different MAC-e PDU sizes (E-TFI) under the reference QoS. The corresponding β for different E-TFIs are given in Table 2.

E-TFI E-TFI1 E-TFI2 ... E-TFIx ... Gain factor β β1 β2 ... βx ...

Table 2

Referring to Figure 2, a MAC-e PDU contains MAC-e signaling and also contains three MAC-d PDUs with different QoS attributes. Assuming that the size of the MAC-e PDU is E-TFIx, and among the MAC-e signaling and the three MAC-d Flows, the QoS requirement of the MAC-e signaling is the highest, then the transmission power required to transmit the data packet is :

P _E-DPDCH ＝P _DPCCH *βx+POs

P _E-DPDCH is the transmission power of the E-DPDCH channel where the MAC-e PDU is located; P _DPCCH represents the transmission power of the DPCCH channel.

Claims (14)

1. A transmission method of MAC-e signaling, comprising steps: 1) The RNC configures the QoS attribute for the MAC-e signaling and notifies the UE; 2) When MAC-e PDU contains only MAC-e signaling but no data, the QoS of MAC-e signaling is the QoS of MAC-e PDU, or when MAC-e PDU contains both MAC-e signaling and For data, the QoS of the entire MAC-e PDU is determined by the QoS of the data part; 3) The UE determines the transmission power of the MAC-e PDU according to the determined QoS, so as to transmit the MAC-e PDU. 2. The method according to claim 1, further comprising: Based on the acknowledgment information of the MAC-e PDU from the base station, the UE determines whether to retransmit or terminate the transmission of the MAC-e signaling. 3. The method according to claim 1, characterized in that the QoS attribute of the MAC-e signaling includes a power offset PO. 4. The method according to claim 1, characterized in that the QoS attribute of the MAC-e signaling includes a maximum number of retransmissions. 5. The method according to claim 2, wherein when the MAC-e PDU is not received by any base station and the number of transmissions does not reach the maximum number of retransmissions of the MAC-e PDU, the entire MAC-ePDU is retransmitted. 6. The method according to claim 2, wherein the transmission of the MAC-e signaling is stopped after the MAC-e PDU is successfully received by all the receiving base stations. 7. The method according to claim 2, characterized in that when the MAC-e signaling content changes before the MAC-e signaling is successfully received by all must-receive base stations, then stop transmitting the old MAC-e signaling command to start transmitting the updated MAC-e signaling. 8. The method according to claim 3, wherein when configuring the QoS power offset PO of MAC-e signaling, the UE is notified by RRC signaling or system information broadcast. 9. The method according to claim 3, characterized in that when configuring the power offset PO of the QoS of the MAC-e signaling, the Node B is notified by the Iub/Iur interface signaling. 10. The method according to claim 4, wherein when the maximum number of retransmissions is not configured for the MAC-e signaling, the maximum number of retransmissions of the entire MAC-e PDU is determined by the data part. 11. The method according to claim 4, wherein the transmission times of MAC-e signaling is not limited by the maximum number of retransmissions of MAC-e PDUs. 12. The method according to claim 4, characterized in that for the maximum number of retransmissions in the QoS of the MAC-e signaling, a fixed value is configured for the MAC-e signaling. 13. The method according to claim 12, characterized in that the fixed value is determined by UTRAN and notified to UE and Node B, or specified in the standard. 14. The method according to any one of claims 6 to 7, characterized in that there is at least one base station that must be received.

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