# US 8,543,140 B2 · Method and apparatus for determining paging time

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- Number: US 8,543,140 B2
- Document ID: US8543140B2
- Status: Granted
- Kind: B2
- Application number: 12/793,480
- Filed: 2010-06-03
- Published: 2010-09-30
- Granted: 2013-09-24
- Earliest claimed: 2007-12-03
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Yinghui Yu
- Inventors: Yinghui Yu
- Web page: https://patentgrep.com/patent/US8543140B2

## CPC

- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04W 4/16: Communication-related supplementary services, e.g. call-transfer or call-hold
- H04W 68/02: Arrangements for increasing efficiency of notification or paging channel
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- 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

## Abstract

The technical solution under the present invention determines paging time by determining the position of the radio sub-frame that includes a paging identifier, with a view to ensuring energy efficiency of a User Equipment (UE). Network-side and user-side paging apparatus and methods are disclosed to perform the paging time determination steps of the invention.

## Claims

### Claim 1

A method for facilitating a network device's capability to page a user equipment (UE), the method comprising:
determining a System Frame Number (SFN) of a radio frame, wherein the radio frame is designated for carrying a Paging Radio Network Temporary Identifier (P-RNTI) for a paging of the UE by the network device, the radio frame comprising a plurality of radio sub-frames, and the P-RNTI being configured to be transmitted by the network device to the UE in a Physical Downlink Control Channel (PDCCH) within one of the plurality of the radio sub-frames in the radio frame; and
determining a position of the radio sub-frame configured to be used in the transmission of the P-RNTI, wherein the determining the position includes consideration of parameters including an International Mobile Subscriber Identifier (IMSI) of the UE being paged, a Discontinuous Reception (DRX) period length of the UE being paged, and a quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 2 (depends on 1)

The method of claim 1, wherein the determining the SFN of the radio frame
includes consideration of parameters including a UE identifier of the UE being paged, the DRX period length, a quantity of paging occasions within the DRX period, and the quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 3 (depends on 2)

The method of claim 2, wherein the UE identifier comprises an identifier related to the IMSI of the UE.

### Claim 4 (depends on 2)

The method of claim 2, wherein the UE identifier is the IMSI of the UE mod a positive integer.

### Claim 5 (depends on 1)

The method of claim 1, wherein the determining the SFN of the radio frame comprises:
determining the SFN according to the following formula:
SFN=(PAGING_DRX_PERIOD div PAGING_OCCASION_NUMBER)* (UE_ID mod PAGING_OCCASION_NUMBER)+n*PAGING_DRX_PERIOD+Frame Offset
wherein the UE_ID indicates a UE identifier of the UE being paged, the PAGING_DRX_PERIOD indicates the DRX period length, the PAGING_OCCASION_NUMBER indicates a quantity of paging occasions within the DRX period length, the Frame Offset indicates an offset of a frame, and the n is a non-negative integer.

### Claim 6 (depends on 1)

The method of claim 1, wherein the determining the SFN of the radio frame comprises:
determining the SFN according to the following formula:
SFN={(UE_ID div M) mod (PAGING_DRX_PERIOD div PAGING_OCCASION_NUMBER)}* PAGING_OCCASION_NUMBER+n*PAGING_DRX_PERIOD+Frame Offset
wherein the UE_ID indicates a UE identifier of the UE being paged, the PAGING_DRX_PERIOD indicates the DRX period length, the PAGING_OCCASION_NUMBER indicates a quantity of paging occasions within the DRX period length, the Frame Offset indicates an offset of a frame, the n is a non-negative integer, and the M indicates the quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 7 (depends on 1)

The method of claim 1, wherein the position of the radio sub-frame is determined according to: (IMSI div Y) mod M, where the IMSI is the IMSI of the UE being paged, the Y is a parameter relating to the DRX period length, and the M is a parameter indicating the quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 8

An apparatus, comprising:
a first determining unit, configured to determine a System Frame Number (SFN) of a radio frame, wherein the radio frame is designated for carrying a Paging Radio Network Temporary Identifier (P-RNTI) for a paging of a user equipment (UE) by a network device, the radio frame comprising a plurality of radio sub-frames, the P-RNTI being configured to be transmitted by the network device to the UE in a Physical Downlink Control Channel (PDCCH) within one of the plurality of the radio sub-frames in the radio frame; and
a second determining unit, configured to determine a position of the radio sub-frame configured to be used in the transmission of the P-RNTI, wherein the position is determined by consideration of parameters including an International Mobile Subscriber Identifier (IMSI) of the UE being paged, a Discontinuous Reception (DRX) period length of the UE being paged, and a quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 9 (depends on 8)

The apparatus of claim 8, wherein
the SFN of the radio frame is determined according to the following formula:
SFN=(PAGING_DRX_PERIOD div PAGING_OCCASION_NUMBER)* (UE_ID mod PAGING_OCCASION_NUMBER)+n*PAGING_DRX_PERIOD+Frame Offset
wherein the UE_ID indicates a UE identifier of the UE being paged, the PAGING_DRX_PERIOD indicates the DRX period length, the PAGING_OCCASION_NUMBER indicates a quantity of paging occasions within the DRX period length, the Frame Offset indicates an offset of a frame, and the n is a non-negative integer.

### Claim 10 (depends on 8)

The apparatus of claim 8, wherein
the SFN of the radio frame is determined according to the following formula:
SFN={(UE_ID div M) mod (PAGING_DRX_PERIOD div PAGING_OCCASION_NUMBER)}* PAGING_OCCASION_NUMBER+n*PAGING_DRX_PERIOD+Frame Offset
wherein the UE ID indicates a UE identifier of the UE being paged, the PAGING_DRX_PERIOD indicates the DRX period length, the PAGING_OCCASION_NUMBER indicates a quantity of paging occasions within the DRX period length, the Frame Offset indicates an offset of a frame, the n is a non-negative integer, and the M indicates the quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 11 (depends on 8)

The apparatus of claim 8, wherein the SFN of the radio frame is determined by consideration of parameters including a UE identifier of the UE being paged, the DRX period length, a quantity of paging occasions within the DRX period length, and the quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein the UE identifier comprises an identifier related to the IMSI of the UE.

### Claim 13 (depends on 11)

The apparatus of claim 11, wherein the UE identifier is the IMSI of the UE mod a positive integer.

### Claim 14 (depends on 8)

The apparatus of claim 8, wherein the apparatus is incorporated into the UE.

### Claim 15 (depends on 8)

The apparatus of claim 8, wherein the apparatus is incorporated into the network device.

### Claim 16 (depends on 8)

The apparatus of claim 8, wherein the position of the radio sub-frame is determined according to: (IMSI div Y) mod M, where the IMSI is the IMSI of the UE being paged, the Y is a parameter relating to the DRX period length, and the M is a parameter indicating the quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 17

A wireless communications apparatus, comprising:
a memory for storing instructions; and
a processor coupled to the memory configured to execute the instructions to allow the apparatus to:
determine a System Frame Number (SFN) of a radio frame, wherein the radio frame is designated for carrying a Paging Radio Network Temporary Identifier (P-RNTI) for a paging of a UE by a network device, the radio frame comprising a plurality of radio sub-frames, the P-RNTI being configured to be transmitted by the network device to the UE in a Physical Downlink Control Channel (PDCCH) within one of the plurality of the radio sub-frames in the radio frame; and
determining a position of the radio sub-frame configured to be used in the transmission of the P-RNTI, wherein the determining the position includes consideration of parameters including an International Mobile Subscriber Identifier (IMSI) of the UE being paged, a Discontinuous Reception (DRX) period length of the UE being paged, and a quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 18 (depends on 17)

The wireless communications apparatus of claim 17, wherein the position of the radio sub-frame is determined according to: (IMSI div Y) mod M, where the IMSI is the IMSI of the UE being paged, the Y is a parameter relating to the DRX period length, and the M is a parameter indicating the quantity of radio sub-frames suitable for the paging in the radio frame.

### Claim 19

A mobile communications system, comprising: a network device in communication with a user equipment (UE), wherein
the network device is configured to:
send a Paging Radio Network Temporary Identifier (P-RNTI) to the UE in a Physical Downlink Control Channel (PDCCH) within a radio sub-frame of a radio frame, wherein a paging message is associated with the P-RNTI, the paging message being configured to be transmitted in a Physical Downlink Shared Channel (PDSCH) within the radio sub-frame; and
the UE is configured to:
determine a System Frame Number (SFN) of the radio frame;
determine a position of the radio sub-frame within the radio frame by consideration of parameters including an International Mobile Subscriber Identifier (IMSI) of the UE, a Discontinuous Reception (DRX) period length of the UE, and a quantity of radio sub-frames suitable for paging in the radio frame;
decode the PDCCH within the radio sub-frame;
obtain the P-RNTI in the PDCCH; and
obtain the paging message associated with the P-RNTI.

### Claim 20 (depends on 19)

The mobile communications system of claim 19, wherein the position of the radio sub-frame is determined according to: (IMSI div Y) mod M, where the IMSI is the IMSI of the UE being paged, the Y is a parameter relating to the DRX period length, and the M is a parameter indicating the quantity of radio sub-frames suitable for the paging in the radio frame.