CN100512054C - Method for reducing terminal power consumption using public physic channel information - Google Patents
Method for reducing terminal power consumption using public physic channel information Download PDFInfo
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- CN100512054C CN100512054C CNB2005101303498A CN200510130349A CN100512054C CN 100512054 C CN100512054 C CN 100512054C CN B2005101303498 A CNB2005101303498 A CN B2005101303498A CN 200510130349 A CN200510130349 A CN 200510130349A CN 100512054 C CN100512054 C CN 100512054C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The method includes following steps: transmitter at network side sends out wireless frame, common physical channel information of each wireless frame includes group info, which is group number of the terminal to receive the wireless frame; after receiving first wireless frame in each transmission time slot, terminal decodes common physical channel information, determines whether the information includes group number of the terminal based on the decoded group info; if the group info is not the group number of the terminal, then the terminal discards receiving remaining wireless frame data in the transmission time slot. The invention terminates receiving subsequent data in advance if the wireless frame data is not needed to receive so as to reduce power consumption.
Description
Technical Field
The present invention relates to a method for reducing power consumption of a terminal, and more particularly, to a method for reducing power consumption of a terminal using common physical channel information.
Background
In the existing mobile communication system, there is a case where a network and a terminal maintain a downlink service connection through a downlink common physical channel (for example, in 3GPP, when the terminal is in a CELL _ FACH state of RRC, the network may send higher-layer data or signaling to the terminal through a common physical channel S-CCPCH). In this case, more than one terminal may monitor the common physical channel, the terminal physical layer decodes the received S-CCPCH signal, and transmits the correctly decoded data to the upper layer (MAC layer), and the upper layer determines whether the data is addressed to the terminal according to the terminal identifier (UEID) in the data.
Data transmitted between the physical layer and the MAC layer has periodicity, which is called a Transmission Time Interval (TTI) of a transport channel in 3 GPP. The transmission time interval of the downlink transport channel in 3GPP may be 10ms, 20ms, 40ms, 80 ms. The fixed radio frame length in 3GPP is 10 ms.
In addition, the physical channel itself may be discontinuous. If the aforementioned downlink common physical channel is discontinuously allocated, in principle, the terminal may turn off the receiver in the transmission gap of the downlink common physical channel without other reception tasks such as measurement, downlink synchronization tracking, and broadcast information reception.
The following is an example of maintaining a downlink traffic connection through a downlink common physical channel in TD-SCDMA of 3 GPP. The radio frame length in TD-SCDMA is 10 ms.
In this example, a 40ms transmission time interval is used, and a discontinuous S-CCPCH is used, with a repetition period of 160ms and a repetition length of 40 ms. In this case, on the sender side on the network side, data blocks are sent out by the higher layer to the physical layer within one transmission time interval. As shown in fig. 1, each data block takes 40ms of transmission time; the wireless frame marked with grey in the figure indicates that the frame is occupied by the S-CCPCH, and the wireless frame marked with white indicates that the frame is not occupied by the S-CCPCH.
For the terminal side, the physical layer must demodulate data in the radio frame occupied by the S-CCPCH, and perform processing such as channel decoding after receiving data of every 40ms, so as to correctly decode the high-level data in a transmission time interval and deliver the data to the high level.
If the physical layer of the terminal has to receive the data in the whole transmission time interval and deliver the data to the data link layer (L2) according to the original practice of 3GPP, it can determine whether the part of data belongs to the terminal itself. This means that the terminal must be in a receiving state for the entire transmission time interval even if the block of data is not addressed to the terminal. On the other hand, a terminal in a receiving state needs to be in a state of high power consumption for operations such as demodulation and decoding.
In some special cases (such as a trunking communication mode), the network may require the terminal to be in a state of maintaining downlink traffic connection using a downlink common physical channel for a long time, which may cause a large power consumption problem of the terminal. This problem becomes particularly acute when the transmission time interval configured on the network side is relatively large. With a general handheld terminal, in a case where the battery capacity is limited, the standby time of the terminal may become short accordingly.
Disclosure of Invention
The invention aims to provide a method for reducing power consumption of a terminal by using common physical channel information.
The method for reducing the power consumption of the terminal by using the common physical channel information comprises the following steps:
step one, a sender at a network side sends wireless frames, wherein the common physical channel information of each wireless frame comprises grouping information, and the grouping information is a group number of a terminal for receiving the wireless frame;
and step two, after receiving the first wireless frame of each transmission time interval, the terminal decodes the common physical channel information in the wireless frame, judges whether the group number of the terminal is the group number of the terminal according to the grouping information obtained by decoding, and abandons to receive the residual wireless frame data in the transmission time interval when the grouping information is not the group number of the terminal.
Wherein the grouping information is generated by grouping the terminals in the network according to the ue ids of the terminals.
After the network combines the grouping information and the TFCI information, the grouping information and the TFCI information are coded according to a coding mode which is the same as that of the TFCI information in the 3GPP specification, and the grouping information and the TFCI information are placed in a wireless frame according to a placement mode which is the same as that of the TFCI information in the 3GPP specification and are transmitted.
The formula for calculating the group number of the terminal is as follows:
wherein, the Group _ ID represents the Group number of the terminal,
representing a rounding down operation and mod a modulo operation.
The packet information and the TFCI information are combined in the following manner:
wherein, TG is a value obtained by combining the packet information and the TFCI information, and Nt is the number of transport format combinations.
The invention has the beneficial effects that: by transmitting the common physical channel information including the grouping information, the terminal can judge whether the data transmitted by the transmitter on the network side is the group number of the terminal from the received grouping information of the first wireless frame, and abandons to receive the subsequent data when the data is not the group number of the terminal, so that the terminal does not need to be in a receiving state in the whole transmission time interval when the data in the transmission time interval is not transmitted to the terminal, thereby avoiding the terminal from being in a state with high power consumption for demodulation, decoding and the like of the data which does not need to be received, and further reducing unnecessary power consumption.
Drawings
Fig. 1 is a frame structure diagram of a radio frame used in 3GPP TD-SCDMA.
Fig. 2 is a flowchart of a method for reducing power consumption of a terminal using common physical channel information according to the present invention.
Fig. 3 is a time slot structure diagram of a radio frame used in the 3GPP TD-SCDMA.
Fig. 4 is a structure diagram of a slot structure of a radio frame formed by the present invention.
Detailed Description
The method for reducing power consumption of a terminal using common physical channel information according to the present invention will be described with reference to the accompanying drawings.
In TD-SCDMA of 3GPP, each terminal has its own terminal id UEID when maintaining downlink service connection through downlink common physical channel. In the present invention, in order to reduce the power consumption of the terminal by using the common physical channel information, the terminals in the network need to be grouped according to the ue id, and it is assumed that the terminals are grouped into Ng groups, where the group numbers are 0, 1, and. Terminals are randomly grouped, but once grouped, the group (group number) in which the terminal is located is fixed in the communication thereafter. The calculation formula of the Group number (Group _ ID) of each terminal is as follows:
wherein,
representing a rounding down operation and mod a modulo operation.
As shown in fig. 2, the method of the present invention comprises the steps of:
step 1, a sender at the network side sends out grouping information in each wireless frame while sending high-level data, wherein the grouping information is a group number of a terminal needing to receive the data.
In 3GPP, Transport Format Combination Information (TFCI) can be carried on a physical channel to indicate the current format of each Transport channel. TFCI is a physical layer control bit and this information is sent over each radio frame. The position of TFCI on the radio frame is shown in fig. 3. When the number of Transport Format Combination (TFC) is Nt, the TFCI before coding takes on values of 0, 1, 2 … … Nt, according to the 3GPP specification, where 1 to Nt can indicate the current type of Transport Format Combination, and 0 is reserved for special burst.
On the basis, in order to transmit grouping information while transmitting high-layer data, the invention provides a new physical layer control information TG (TFCI and Group information), which is formed by combining TFCI information before encoding and grouping information, and as can be seen from formula 2, the physical layer control information TG contains the TFCI information before encoding and the grouping information at the same time.
Since TFCI is 0 and is reserved for the special burst, TG is 0 and is reserved for the special burst in the present invention, but the present invention is not limited to this. Thus, TG has a total of Ng × Nt +1 possible values; for a specific Group (Group _ ID ═ S) of terminals, the effective TG includes a total of Ng +1 elements {0, 1+ sxnt, 2+ sxnt … … Ng + sxnt }.
After the transmitter generates the TG, the TG is encoded in such a manner that the TFCI is encoded by the 3 GPP. The encoded TG is transmitted over the radio frame instead of the TFCI bits in 3GPP, as shown in fig. 4. Thus, each radio frame carries the entire physical layer control information TG including packet information and TFCI information.
And 2, after receiving the first wireless frame of each transmission time interval, the terminal decodes the domain where the TG information is located and judges whether the grouping information is the group number of the terminal, if not, the terminal abandons the reception of the subsequent data, and if so, the terminal continues to receive the subsequent data.
By the above method, when data is not sent to a terminal in the group number where a certain terminal is located, the terminal can be prevented from being in a receiving state in the whole transmission time interval, and thus the terminal is reserved for special burst use, which of course is not limited to this provision. Thus, TG has a total of Ng × Nt +1 possible values; for a specific Group (Group _ ID ═ S) of terminals, the effective TG includes a total of Nt +1 elements {0, 1+ sxnt, 2+ sxnt … … Nt + sxnt }.
After the transmitter generates the TG, the TG is encoded in such a manner that the TFCI is encoded by the 3 GPP. The encoded TG is transmitted over the radio frame instead of the TFCI bits in 3GPP, as shown in fig. 4. Thus, each radio frame carries the entire physical layer control information TG including packet information and TFCI information.
And 2, after receiving the first wireless frame of each transmission time interval, the terminal decodes the domain where the TG information is located and judges whether the grouping information is the group number of the terminal, if not, the terminal abandons the reception of the subsequent data, and if so, the terminal continues to receive the subsequent data.
By the method, when the data is not sent to the terminal in the group number of the terminal, the terminal is prevented from being in the receiving state in the whole transmission time interval, so that the receiving state is ended in advance when the terminal does not receive the data, the power consumption of the terminal is reduced, and the standby time of the terminal is prolonged.
In order to further understand the present invention, the method of the present invention is further illustrated below by way of an example.
In this example, the case where the terminals are divided into 4 groups will be described. There is only one FACH channel in the CCTrCH where the current FACH is located, there are 3 transport formats { TF0, TF1, TF2}, and the system configures 16 encoded TG bits for the CCTrCH.
In this configuration, Ng is 4, Nt is 3, and the TFCI takes {0, 1, 2, 3}, where TFCI takes values 1, 2, and 3 respectively corresponding to transport formats TF0, TF1, and TF 2. Users using the FACH are divided into 4 groups (Group _ ID 0, 1, 2, 3, respectively). Assume that the current FACH is sent to group 1 users and uses the transport format of TF 2; namely, Group _ ID is 1 and TFCI is 3. Then at this point:
TG＝TFCI(3)+Group_ID×Nt(3)＝6
the value of TG is 6, and the binary value is 0110. The TG before coding (i.e. four binary bits 0110) is coded into 16 bits according to the TFCI coding mode of 3GPP, and then is split into 4 parts (according to the split TFCI mode) and is sent out in 1 wireless frame.
In the above embodiment, a transmission time interval of 40ms is used and a discontinuous S-CCPCH (repetition period is 160ms, repetition length is 40ms) is used as an example for explanation, and it is understood that the method of the present invention can be similarly applied to the cases of transmission time intervals of 10ms, 20ms and 80ms according to the above detailed description.
The present invention is not limited to the above-described embodiments, and those skilled in the art who have the benefit of this disclosure will readily appreciate that modifications, variations, and equivalents of the present invention can be made without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. A method for reducing power consumption of a terminal using common physical channel information, the method comprising the steps of:
step one, a sender at a network side sends wireless frames, wherein the common physical channel information of each wireless frame comprises grouping information, and the grouping information is a group number of a terminal for receiving the wireless frame;
and step two, after receiving the first wireless frame of each transmission time interval, the terminal decodes the common physical channel information in the wireless frame, judges whether the group number of the terminal is the group number of the terminal according to the grouping information obtained by decoding, and abandons to receive the residual wireless frame data in the transmission time interval when the grouping information is not the group number of the terminal.
2. The method of claim 1, wherein the grouping information is generated by grouping terminals in the network according to the ue ids of the terminals.
3. The method as claimed in claim 1, wherein the network combines the packet information with the TFCI information, encodes the combined packet information in the same encoding manner as the TFCI information in the 3GPP specification, and puts the combined packet information in the same placement manner as the TFCI information in the 3GPP specification into a radio frame to transmit the combined packet information.
4. The method of claim 2, wherein the calculation formula of the group number of the terminal is:
wherein, Group _ ID is the Group number of the terminal, Ng represents the Group number of grouping the terminals in the network according to the UE ID of the terminal,
representing a rounding down operation and mod a modulo operation.
5. The method as claimed in claim 3, wherein the packet information is combined with the TFCI information in a manner of:
wherein, TG is a value obtained by combining the grouping information and the TFCI information, Group _ ID is a Group number where the terminal is located, and Nt is the number of transport format combinations.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101303498A CN100512054C (en) | 2005-12-09 | 2005-12-09 | Method for reducing terminal power consumption using public physic channel information |
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| CNB2005101303498A CN100512054C (en) | 2005-12-09 | 2005-12-09 | Method for reducing terminal power consumption using public physic channel information |
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| CN1980091A CN1980091A (en) | 2007-06-13 |
| CN100512054C true CN100512054C (en) | 2009-07-08 |
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