CN1288921C - Demodulation method - Google Patents

Demodulation method Download PDF

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CN1288921C
CN1288921C CN 03109250 CN03109250A CN1288921C CN 1288921 C CN1288921 C CN 1288921C CN 03109250 CN03109250 CN 03109250 CN 03109250 A CN03109250 A CN 03109250A CN 1288921 C CN1288921 C CN 1288921C
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channel
control channel
cycle
execution
paging
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CN1536902A (en
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陈德
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The present invention discloses a demodulation method, which comprises the steps that a down common transmission channel is loaded in a down common control physical channel; a control channel period of the down common control physical channel is set, and a discontinuous demodulation paging period is set; the discontinuous demodulation paging period comprises M control channel periods, numbers the M control channel periods consecutively to obtain a control channel periodic key, and calculates a monitoring control channel periodic key; the method judges whether the current control channel periodic key is equal to the monitoring control channel periodic key, if true, then configure the down common transmission channel at the network side, demodulate the down common transmission channel at the user equipment side, else, wait for next control channel cycle period, and judge whether the current control channel periodic key is equal to the monitoring control channel periodic key. The method of the present invention makes all user equipment in the whole cell rang share one down paging resource so as to avoid the transmission blocking or resource wasting of the down paging channel.

Description

A kind of demodulation method
Technical field
The present invention relates to moving communicating field, be meant a kind of demodulation method especially.
Background technology
In TD SDMA (TD-SCDMA) system, subscriber equipment (UE) is at idle pulley (IDLE), and under cell paging channel (CELL-PCH) state of connection mode and access net registration district paging channel (URA-PCH) state, usually employing discontinuous demodulation (DRX) mode monitors the paging from network side, in order to reduce the battery power consumption of UE.
The down channel of TD-SCDMA system mainly comprises downlink common transport channel and down public common.Downlink common transport channel comprises: broadcast channel (BCH), forward access channel (FACH) and paging channel (PCH).Wherein, the BCH channel is used for all UE broadcast system informations in the sub-district, and the FACH channel is used to carry user-specific information, and the PCH channel is used for paging UE.Down public common comprises: first Common Control Physical Channel (PCCPCH), S-CCPCH Secondary Common Control Physical Channel (SCCPCH), Page Indication Channel (PICH) and AICH Acquisition Indication Channel (AICH).Wherein, the PCCPCH channel is used for broadcasting, and the AICH channel is used for inserting at random.Below introduce in detail transmission channel and the physical channel relevant, i.e. PCH channel, SCCPCH channel and PICH channel with paging.
The PCH channel of transmission channel to the mapping relations of the SCCPCH channel of physical channel is: corresponding to a definite SCCPCH channel, can carry a PCH channel at most, also can not have the PCH channel Mapping to this SCCPCH channel.Corresponding to the SCCPCH channel of a PCH channel Mapping on it, must there be a PICH channel to be associated with this SCCPCH channel.And the SCCPCH channel that does not carry the PCH channel is not associated with the PICH channel.Therefore, the PICH channel has relation one to one with the SCCPCH interchannel that has carried the PCH channel, this shows that PICH channel and PCH interchannel have indirect one-to-one relationship.
Under the cell paging channel status of idle pulley or connection mode/access net registration district paging channel state, UE need monitor the paging from network side.In a sub-district, have many SCCPCH channels usually, UE does not need to monitor all SCCPCH channels, but selects a SCCPCH channel that carries the PCH channel according to formula (i), then it is monitored.Network is also selected a SCCPCH channel that carries the PCH channel according to formula (i), in order to issuing page message.
“Index?of?selected?SCCPCH”＝IMSI?mod?K (i)
Wherein, IMSI is the IMSI International Mobile Subscriber Identity of UE; K is the channel quantity of the SCCPCH channel of carrying PCH channel in the current area that provides of broadcast, in the SCCPCH channel that does not carry the PCH channel is not calculated in, SCCPCH channel number consecutively to K bar carrying PCH channel is 0,1,2......K-1 wherein the numbering of SCCPCH channel is called the index of this SCCPCH channel; " Index of selected SCCPCH " is the index of selected SCCPCH channel, and its span correspondingly is [0, K-1]; Mod is a positive integer modulo operation function.
Distribute to UE randomly because formula (i) will carry the SCCPCH channel of PCH channel, therefore, generally speaking, the PCH channel resource can be distributed to uniformly the UE in the current area as far as possible.
Under the cell paging channel status of idle pulley or connection mode/access net registration district paging channel state, when UE monitors from the paging of network side, directly do not monitor the SCCPCH channel of carrying PCH channel, but discrete supervision and the corresponding PICH channel of this SCCPCH channel.
Four related notions are arranged in the discontinuous demodulation of TD-SCDMA system, be respectively discontinuous demodulation paging cycle (DRX Cycle), paging occasion (PO, Paging Occasion), paging indicating positions (PIP, Paging Indicator Position) and paging message receiving occasion (Paging Message Receiving Occasion).Be described respectively below.
In a DRX Cycle, UE only monitors paging indication (PI) corresponding in the frame of PICH channel.The computing formula of DRX Cycle is:
DRX?Cycle＝MAX(2 k，PBP) (ii)
Wherein, k is the system broadcasts parameter, and span is [6,9]; PBP is paging block periodicity (PagingBlock Periodicity), and the PBP cycle is the PICH piece repetition period that provides in the broadcast; MAX is for getting max function.
In a DRX Cycle, the paging block (Paging Block) that UE monitors is PICH piece (PICH Block) in essence, and PO is first frame of this PICH piece.The computing formula of PO is:
PO＝SFN?mod(DRX?Cycle)＝{(IMSI?div?K)mod[(DRX?Cycle)divPBP]}*PBP+n*DRX?Cycle+Frame?Offset (iii)
Wherein, SFN is a System Frame Number; N=0,1,2......, and n must satisfy paging occasion as SFN, can not surpass the maximum 4095 of SFN; Frame Offset is vertical shift; Div is the nonnegative integer division arithmetic, and its result is merchant's round numbers.
Fig. 1 is a PICH channel PO schematic diagram in the TD-SCDMA system in the prior art, as shown in Figure 1, when a DRX Cycle 101 is four paging blocks 202, div PBP (if IMSI div K) mod[(DRX Cycle)]=2, PO=SFN mod (DRX Cycle)=(2*PBP+FrameOffset 203) then, this moment, the paging occasion of UE was first frame of the 3rd paging block among the DRX Cycle, and this piece marks with grey in Fig. 1.
Next calculate the paging indicating positions.
PIP＝(IMSI?div?8192)mod?N P (iv)
Wherein, N PTotal number for PI in each PICH piece; (IMSI div 8192) is DRX index (DRX Index).PIP is used for determining in each PICH piece, with the residing frame of the corresponding PI of this UE, promptly with the position of the corresponding PI of this UE.
Fig. 2 is a PICH channel frame structural representation in the TD-SCDMA system, and as shown in Figure 2, the length of each frame is 10 milliseconds (ms), the subframe that wherein to comprise two length be 5ms, totally 352 bits.Each paging indication PI qBe mapped to two data parts of two subframes respectively, wherein, q=0,1, N PI-1, PI q∈ 0,1}.N PIBe the number of PI in every frame, each PI corresponding bit number in each subframe can be L PI=2, L PI=4 or L PI=8, because every frame totally 352 bits, therefore accordingly, the number of PI is N in every frame P1=88, N PI=44 or N P1=22, can obtain 2*N PI* L PI=352.White portion bit data part in the way comprises 352 bits that are used for PI, and Midamble is middle pilot portion, and Guard Period is the guard time section.First subframe comprises preceding 176 bits, and second subframe comprises back 176 bits, and each subframe is divided into two data parts by Midamble again.First data division of first subframe is (S 1, S 2, S 5, S 6... S 173, S 174), second data division of first subframe is (S 3, S 4, S 7, S 8... S 175, S 176); First data division of second subframe is (S 177, S 178, S 181, S 182... S 349, S 350), second data division of second subframe is (S 179, S 180, S 183, S 184... S 351, S 352).
Fig. 3 is a PICH block structure schematic diagram in the TD-SCDMA system, as shown in Figure 3, in each PICH piece N is arranged PICHTherefore individual frame has N in a PICH piece P=N PI* N PICHIndividual PI.
When PI=1, UE is according to the corresponding PCH subchannel of paging message receiving occasion demodulation.
Paging?Message?Receiving?Occasion＝PO+N PICH+N GAP+{[(DRX?Index)mod?N P]mod?N PCH}*2 (v)
Wherein, N PICHThe frame number that comprises for each PICH piece; N GAPThe frame number of being separated by for PICH piece and PCH interblock corresponding with it; N PTotal number for PI in each PICH piece; N PCHBe PCH number of subchannels in each PCH piece; 2 is each PCH subchannel frame number.
Fig. 4 is that the PICH piece concerns schematic diagram with corresponding PCH piece in the TD-SCDMA system, and as shown in Figure 4, PO is positioned at the section start of PICH piece, and each PCH subchannel is two frames, and the frame number that PICH piece and PCH interblock corresponding with it are separated by is N GAP
Fig. 5 is a discontinuous demodulating process flow chart in the TD-SCDMA system in the prior art, as shown in Figure 5, is divided into UE and the two-part discontinuous demodulating process of UTRAN in the prior art in the TD-SCDMA system, below narration respectively.
The discontinuous demodulating process of UE may further comprise the steps:
Step 501:UE selects the SCCPCH channel according to formula (i).
Step 502:UE (ii) calculates DRX Cycle according to formula.
Step 503:UE (iii) calculates paging occasion PO according to formula, determines to receive the paging block of PI.
Step 504:UE (iv) calculates PIP according to formula, Paging Indicator Position, definite position that receives PI.
Step 505:UE prepares demodulation PI according to the position PIP of DRX Cycle, PO and PI.
Step 506:UTRAN issues PI by the PICH channel, and UE judges whether PI is 1, if, execution in step 507; Otherwise, execution in step 510.
Step 507:UE (v) calculates paging message receiving occasion (Paging MessageReceiving Occasion) according to formula.
Step 508:UE prepares paging receiving message.
Step 509:UTRAN is by PCH channel issuing page message, and the beep-page message of UE on paging message receiving occasion reception PCH channel carries out subsequent treatment then.
Step 510:UE changes resting state over to, waits for the arrival of next DRX Cycle, and execution in step 505 then.
The discontinuous demodulating process of UTRAN may further comprise the steps:
Step 511:UTRAN selects the SCCPCH channel according to formula (i).
Step 512:UTRAN (ii) calculates DRX Cycle according to formula.
Step 513:UTRAN (iii) calculates paging occasion PO according to formula, determines to send the paging block of PI.
Step 514:UTRAN (iv) calculates PIP according to formula, Paging Indicator Position, definite position that sends PI.
Step 515:UTRAN prepares configuration PI according to the position PIP of DRX Cycle, PO and PI, and PI is set, PI=1, and this has beep-page message; PI=0, this does not have beep-page message.
Step 516:UTRAN issues PI by the PICH channel, and UTRAN judges whether PI is 1, if, execution in step 117; Otherwise, execution in step 120.
Step 517:UTRAN (v) calculates paging message receiving occasion (Paging MessageReceiving Occasion) according to formula.
Step 518～step 519:UTRAN prepares to send beep-page message by the PCH channel, at the paging message receiving occasion issuing page message, carries out subsequent treatment then.
Step 520:UTRAN changes resting state over to, waits for the arrival of next DRX Cycle, and execution in step 515 then.
Step 501～step 510 is parallel two processes of carrying out with step 511～step 520.
By the description of paging in the above-mentioned TD-SCDMA system, as can be seen: owing to be provided with many SCCPCH channels in the TD-SCDMA system, UE and network need be selected at random to this.May occur selecting the UE of some PCH channel too much, load is overweight, forms transmission bottleneck; And some PCH channel does not have UE to select, and causes the distribution inequality of descending paging channel resource in the sub-district, causes the waste of resource.Be provided with PICH channel corresponding at each bar PCH channel, taken more downlink resource with it.Because PICH channel and the SCCPCH interchannel that is associated with it have defined comparatively complicated timing relationship, increased the complexity of system greatly, improved the cost of the terminal and the network equipment.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of demodulation method, make all subscriber equipmenies in the whole cell range can share same descending paging resource, with the demodulation paging channel.
In order to achieve the above object, the invention provides a kind of demodulation method, downlink common transport channel be carried on descending Common Control Physical Channel,
Network side comprises following steps:
A1, control channel cycle of descending Common Control Physical Channel is set, discontinuous demodulation paging cycle is set, this discontinuous demodulation paging cycle comprises M control channel cycle, and to this M the controlled channel cycle index of control channel cycle number consecutively, M is a constant;
B1, calculating monitor the control channel periodic key, computational process is: this supervision control channel periodic key is to the value of the M delivery that comprises in each discontinuous demodulation paging cycle, and a functional value that is variable with IMSI International Mobile Subscriber Identity and this M of subscriber equipment equates;
C1, judge whether current control channel periodic key equals to monitor the control channel periodic key, if equal, execution in step D1, otherwise, execution in step E1;
D1, the downlink common transport channel that will be used to transmit message in the cycle at current control channel are carried on descending Common Control Physical Channel;
E1, wait next control channel cycle, execution in step C1 then.
User equipment side comprises following steps:
A2, control channel cycle of descending Common Control Physical Channel is set, discontinuous demodulation paging cycle is set, this discontinuous demodulation paging cycle comprises M control channel cycle, and to this M the controlled channel cycle index of control channel cycle number consecutively, M is a constant;
B2, calculating monitor the control channel periodic key, computational process is: this supervision control channel periodic key is to the value of the M delivery that comprises in each discontinuous demodulation paging cycle, equates with the functional value that IMSI International Mobile Subscriber Identity and this M with subscriber equipment is variable;
C2, judge whether current control channel periodic key equals to monitor the control channel periodic key, if equal, execution in step D2, otherwise, execution in step E2;
D2, receive message by the downlink common transport channel that is carried on the descending Common Control Physical Channel in the cycle at current control channel; E2, wait next control channel cycle, execution in step C2 then.
Described downlink common transport channel is multiplexing in same physical layer data bag in the cycle at each control channel.
Described step D1 judges whether issuing page message after further comprising following steps: D11, configurating downlink Common transport channel, if, execution in step D12, otherwise, execution in step D13;
D12, in the cycle beep-page message is sent beep-page message by downlink common transport channel to subscriber equipment at current control channel; D13, wait next control channel cycle, execution in step C1 then.
Described step D2 judges whether paging receiving message after further comprising following steps: D21, demodulation downlink common transport channel, if, execution in step D22, otherwise, execution in step D23;
D22, receive beep-page message by downlink common transport channel in the cycle from network side at current control channel; D23, wait next control channel cycle, execution in step C2 then.
Described step D21 further comprises: judge whether the user identity in the beep-page message is consistent with self, if unanimity, execution in step D22 then; Otherwise, execution in step D23.
Described M is provided with according to subscriber equipment battery consumption situation.
Described functional value is the value of the IMSI International Mobile Subscriber Identity of subscriber equipment to this M delivery.
Described functional value is the Hash functional value of parameter for IMSI International Mobile Subscriber Identity and this M with subscriber equipment.
Described downlink common transport channel comprises paging channel at least.
By the method that the present invention proposes, make all UE in the whole cell range can share same descending paging resource, avoid the transmission bottleneck or the wasting of resources of descending PCH channel as far as possible.In the present invention,, removed the PICH channel, saved the common down channel resource, and then simplified quantity of parameters in the DRX process and the implementation procedure of DRX, reduced the complexity of the terminal and the network equipment with respect to existing TD-SCDMA system.
Description of drawings
Fig. 1 is a PICH channel PO schematic diagram in the TD-SCDMA system in the prior art;
Fig. 2 is a PICH channel frame structural representation in the TD-SCDMA system;
Fig. 3 is a PICH block structure schematic diagram in the TD-SCDMA system;
Fig. 4 is that the PICH piece concerns schematic diagram with corresponding PCH piece in the TD-SCDMA system;
Fig. 5 is a discontinuous demodulating process flow chart in the TD-SCDMA system in the prior art;
Fig. 6 is discontinuous demodulating process flow chart in the TD-SCDMA system among the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention proposes a kind of scheme of improving descending Common Control Physical Channel, only adopt descending Common Control Physical Channel carrying PCH channel, BCH channel and a FACH channel, the PCH channel that is used to transmit, BCH channel and FACH channel are all multiplexing at this descending Common Control Physical Channel, no longer keep the PICH channel in the sub-district.
The control channel cycle of a set time as descending Common Control Physical Channel is set, and in the cycle, PCH channel, BCH channel and FACH channel are all multiplexing in same physical layer data bag at a control channel.
Fig. 6 as shown in Figure 6, is divided into the two-part discontinuous demodulating process of UE and UTRAN for discontinuous demodulating process flow chart in the TD-SCDMA system among the present invention in the TD-SCDMA system, below narration respectively.
The discontinuous demodulating process of UE may further comprise the steps:
Step 601～step 603: the control channel cycle of descending Common Control Physical Channel is set, and in the cycle, PCH channel, BCH channel and FACH channel are all multiplexing in same physical layer data bag at a control channel.This control channel cycle can be set to a set time, for example time span of 128 frames.Under the cell paging channel status of idle pulley or connection mode/access net registration district paging channel state, UE periodically, discontinuously read descending Common Control Physical Channel.It is M control channel cycle that UE is provided with DRX Cycle, and with this M control channel cycle number consecutively, is called the index in this control channel cycle with certain corresponding numbering of control channel cycle.Monitor a paging in the every M of the UE control channel cycle.
Step 604: calculate and monitor control channel periodic key (IMCC).
“Index?of?Monitored?CC?Cycle”mod?M＝F(IMSI，M) (vi)
M is a constant; (IMSI M) is mapping function between IMSI and M to F; Mod is the delivery value.
(control channel periodic key vi) is called supervision control channel periodic key IMCC, is called the control channel cycle that monitors with this IMCC corresponding control channel cycle to satisfy formula.UE is being in monitored state with IMCC in the corresponding supervision control channel cycle, and at this control channel descending Common Control Physical Channel of demodulation in the cycle, and then PCH channel, BCH channel and FACH channel on it are shone upon in demodulation.UE reads paging information on the PCH channel by the descending Common Control Physical Channel of demodulation.
(the control channel periodic key corresponding control channel cycle vi) is called the sleep control channel cycle, and UE is in sleep state at these sleep control channels in the cycle, and descending Common Control Physical Channel is not carried out demodulation with not satisfying formula.
Step 605:UE judge current control channel periodic key whether equal formula (IMCC vi), if equal, execution in step 606; Otherwise, execution in step 610.
Step 606～step 607:UE is being in monitored state with IMCC in the corresponding supervision control channel cycle, and at this control channel descending Common Control Physical Channel of demodulation in the cycle, and then PCH channel, BCH channel and FACH channel on it are shone upon in demodulation.UE judges whether the user identity (ID) in the radio resource control layer beep-page message is consistent with self, if consistent, shows that UTRAN has sent beep-page message to this UE, and execution in step 608 then; Otherwise, execution in step 611.
Step 608:UE prepares to accept beep-page message.
Step 609:UTRAN is by PCH channel issuing page message, and UE paging receiving message is carried out subsequent treatment then.
Step 610:UE waits for the next control channel cycle.(the control channel periodic key corresponding control channel cycle vi) is called the sleep control channel cycle, and UE is in sleep state at these sleep control channels in the cycle, and descending Common Control Physical Channel is not carried out demodulation with not satisfying formula.
Step 611:UE changes resting state over to, waits for the arrival of next DRX Cycle, and execution in step 605 then.
The discontinuous demodulating process of UTRAN may further comprise the steps:
Step 612～step 615 is basic identical with step 601～step 604, and difference only is that the executor is UTRAN.
Step 616:UTRAN judge current control channel periodic key whether equal formula (IMCC vi), if equal, execution in step 617; Otherwise, execution in step 621.
Step 617:UTRAN is mapped in PCH channel, BCH channel and the FACH channel of descending Common Control Physical Channel disposing in the corresponding supervision control channel cycle with IMCC, and judges whether to this UE issuing page message, if, execution in step 619; Otherwise, execution in step 622.
Step 619～step 620:UTRAN prepares to send beep-page message by the PCH channel, carries out subsequent treatment behind the issuing page message.
Step 621:UTRAN waits for the next control channel cycle.
Step 622:UTRAN changes resting state over to, waits for the arrival of next DRX Cycle, and execution in step 616 then.
Constant M decision UE monitors the frequency of paging, and M is big more, and the time of expression UE sleep is long more, and battery consumption is more little; Otherwise M is more little, and the time of expression UE sleep is short more, and battery consumption is big more.
Be provided with F (IMSI, purpose M) is all UE in the cell range are evenly separated, for example, F (IMSI, M)=IMSI mod M, or F (IMSI M) is the parameter hash function of IMSI and M.Along with the variation of IMSI, (IMSI, function value M) is in [0, M-1] interior even variation for F.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (9)

1, a kind of demodulation method is characterized in that: downlink common transport channel is carried on descending Common Control Physical Channel,
Network side comprises following steps:
A1, control channel cycle of descending Common Control Physical Channel is set, discontinuous demodulation paging cycle is set, this discontinuous demodulation paging cycle comprises M control channel cycle, and to this M the controlled channel cycle index of control channel cycle number consecutively, M is a constant;
B1, calculating monitor the control channel periodic key, computational process is: this supervision control channel periodic key is to the value of the M delivery that comprises in each discontinuous demodulation paging cycle, and a functional value that is variable with IMSI International Mobile Subscriber Identity and this M of subscriber equipment equates;
C1, judge whether current control channel periodic key equals to monitor the control channel periodic key, if equal, execution in step D1, otherwise, execution in step E1;
D1, the downlink common transport channel that will be used to transmit message in the cycle at current control channel are carried on descending Common Control Physical Channel;
E1, wait next control channel cycle, execution in step C1 then.
User equipment side comprises following steps:
A2, control channel cycle of descending Common Control Physical Channel is set, discontinuous demodulation paging cycle is set, this discontinuous demodulation paging cycle comprises M control channel cycle, and to this M the controlled channel cycle index of control channel cycle number consecutively, M is a constant;
B2, calculating monitor the control channel periodic key, computational process is: this supervision control channel periodic key is to the value of the M delivery that comprises in each discontinuous demodulation paging cycle, equates with the functional value that IMSI International Mobile Subscriber Identity and this M with subscriber equipment is variable;
C2, judge whether current control channel periodic key equals to monitor the control channel periodic key, if equal, execution in step D2, otherwise, execution in step E2;
D2, receive message by the downlink common transport channel that is carried on the descending Common Control Physical Channel in the cycle at current control channel;
E2, wait next control channel cycle, execution in step C2 then.
2, method according to claim 1 is characterized in that: described downlink common transport channel is multiplexing in same physical layer data bag in the cycle at each control channel.
3, method according to claim 1, it is characterized in that described step D1 further comprises following steps: D11, configurating downlink Common transport channel after, judge whether issuing page message, if, execution in step D12, otherwise, execution in step D13;
D12, in the cycle beep-page message is sent beep-page message by downlink common transport channel to subscriber equipment at current control channel;
D13, wait next control channel cycle, execution in step C1 then.
4, method according to claim 1, it is characterized in that described step D2 further comprises following steps: D21, demodulation downlink common transport channel after, judge whether paging receiving message, if, execution in step D22, otherwise, execution in step D23;
D22, receive beep-page message by downlink common transport channel in the cycle from network side at current control channel;
D23, wait next control channel cycle, execution in step C2 then.
5, method according to claim 4 is characterized in that described step D21 further comprises: judge whether the user identity in the beep-page message is consistent with self, if unanimity, execution in step D22 then; Otherwise, execution in step D23.
6, method according to claim 1 is characterized in that: described M is provided with according to subscriber equipment battery consumption situation.
7, method according to claim 1 is characterized in that: described functional value is the value of the IMSI International Mobile Subscriber Identity of subscriber equipment to this M delivery.
8, method according to claim 1 is characterized in that: described functional value is the Hash functional value of parameter for IMSI International Mobile Subscriber Identity and this M with subscriber equipment.
9, method according to claim 1 is characterized in that: described downlink common transport channel comprises paging channel at least.
CN 03109250 2003-04-07 2003-04-07 Demodulation method Expired - Fee Related CN1288921C (en)

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