CN1939081A - Transmission of notifications for broadcast and multicast services - Google Patents

Abstract

The invention transmits notification indicators for broadcast and multicast services, a base station maps the services to random sequences based on their identifiers. The base station generates the random sequence for each service based on a hash function or a PN generator and the service identifier. Each random sequence is associated with a specific location for sending a notification indicator in each frame. The locations for the notification indicators for each random sequence are randomized with respect to the locations for the notification indicators for each remaining random sequence. This randomness characteristic reduces the likelihood of false alarm. For each service, the base station sets the notification indicators to the same notification value in each modification period. The base station transmits the notification indicators for each service at the random locations determined by the random sequence for the service.

Description

Be used to broadcast transmission with the notice of multicast services

Require the priority of 35 U.S.C. § 119

The present invention requires on February 11st, 2004 to submit to, title transfers the 60/544th of its assignee for " Reduction ofFalseAlarm in the Context of a Multimedia Broadcast/Multicast Service's (MBMS) ", the priority of No. 283 provisional application specially is combined in herein as a reference at this.

Technical field

The present invention relates generally to communication, relate more specifically in communication system to transmit and to receive the technology that is used to broadcast with the notice of multicast services.

Background technology

Communication system can provide clean culture, multicast, and/or broadcast service.Unicast services provides the point-to-point communication between at least one base station and the particular wireless device.Multicast services provides the point-to-multipoint delivery between at least one base station and the one group of wireless device.Broadcast service provides the point-to-multipoint delivery between all wireless devices at least one base station and the designated broadcast zone.Some examples of multicast and broadcast service comprise news and data, services, based on the service of subscribing, push-to-talk etc.Multicast and broadcast service can send data contingently, periodically or constantly to wireless device.

Communication system may need the broadcasting that transmitting system supports and the signaling (for example, control information, configuration information etc.) of multicast.This signaling can send on control channel.The wireless device that receives one or more services then can be monitored the control channel that sends signaling for the service that is receiving.No matter when wireless device no longer with system in one or more base stations carry out exchanges data, wireless device can be with idle condition work.In idle condition, wireless device is periodically waken up, with from system's paging receiving message and Overhead Message, and in order to conserve battery power, all the other times with down circuitry as much as possible.For wireless device, when it is revived, very wish to be notified in the reception condition of the signaling that sends for service on the control channel.Wireless device can either receive the related news of itself, can receive the signaling that does not need the service that the overspending battery electric power just can receive again.

Therefore, in the art, need be used to be sent as the technology of notice of the signaling of broadcasting and multicast services transmission.

Summary of the invention

The technology that transmits and receive the notification indicator of broadcasting and multicast in communication system has been described herein.The base station becomes random sequence with map of services, and each is served based on the identifier of serving corresponding to a random sequence.The base station generates random sequence and generates service identifier for each service based on hash (hash) function or pseudo random number (PN) generator.No matter generate how many random sequences, each random sequence is associated with the ad-hoc location of transmission notification indicator in every frame.The position of the notification indicator of each random sequence is randomized with respect to the position of the notification indicator of each residue random sequence.This stochastic behaviour has reduced the probability of false alarm, and is as described below.For each service, identical notice value is arranged to notification indicator in the base station in each modification cycle, and the modification cycle wherein can be any time section.The notification indicator of each service of transmission is gone up at the MBMS indicator channel (MICH) that is positioned at the random position of determining by the random sequence of this service in the base station.The base station is also on the indicator channel (PICH) in distributing to each frame of wireless device, and in the position of determining by the PICH sequence of wireless device, transmits the Paging Indicator of each idle wireless device.

In order to receive the notification indicator of at least one required service, wireless device is determined random sequence for each required service.Wireless device also determines to receive therein the frame of its Paging Indicator.For in these frames of " reviving " each, the Paging Indicator that wireless device reception (1) is being passed through the wireless device of the position on the definite PICH of PICH sequence in notification indicator and (2) of each service of the position on the MICH that determines by the random sequence of service.Wireless device is in each modification cycle, based on all notification indicator that receive for this service in this modification cycle, for the notice value is determined in each service.

Describe each side of the present invention and each embodiment below in detail.

Description of drawings

Fig. 1 shows wireless communication system;

Fig. 2 A shows the form of the PICH in the Universal Mobile Telecommunications System (UMTS);

Fig. 2 B shows the form of the frame of PICH;

Fig. 3 shows the transmission on PICH, MICH, MCCH and the MTCH among the exemplary UMTS;

Fig. 4 shows two random sequences of the random site with notification indicator;

Fig. 5 shows the processing that transmits notification indicator by the broadcasting of supporting for the base station of base station execution and multicast services;

Fig. 6 shows the processing of the notification indicator of at least one service of reception of being carried out by wireless device;

Fig. 7 shows the block diagram of base station and wireless device.

Embodiment

Use " exemplary " speech to represent " example or illustration as an example, " herein.Be described as " exemplary " any embodiment herein and there is no need to be considered to preferred or more superior than other embodiment.

Fig. 1 shows the wireless communication system 100 that can support multimedia broadcasting and multicast services.System 100 comprises the base station 110 of communicating by letter with wireless device 120.For easy, in Fig. 1, only show two base stations 110 and six wireless devices 120.The base station is a fixed base stations, also can become Node B, base station transceiver subsystem (BTS), access point or some other terms.Wireless device can be also can moving of fixing, and can also be called as subscriber equipment (UE), travelling carriage, terminal or some other terms.

Radio network controller (RNC) 130 is connected to base station 110, and coordination and control to these base stations are provided.RNC 130 also can be called as base station controller (BSC) or some other terms.Core network (CN) 132 is connected to RNC 130 and other system and network, such as public switch telephone network (PSTN), Packet Switch Data Network etc.Core network 132 interconnects system 100 and these other systems and network.

System 100 can be code division multiple access (CDMA) system, time division multiple access (TDMA) system, frequency division multiple access (FDMA) system, OFDM (OFDMA) system or some other multi-address systems.Cdma system can be realized one or more cdma wireless access technologies (RAT), such as wideband CDMA (W-CDMA) and cdma2000.Cdma2000 is contained IS-2000, IS-856 and IS-95 standard.Tdma system can be realized one or more TDMA RAT, such as global system for mobile communications (GSM).RAT that these are different and standard are well-known in the present technique field.UMTS is to use W-CDMA and the GSM system as RAT, and is described in from the document that is called as " third generation partnership project " alliance (3GPP).Cdma2000 is described in from the document that is called as " third generation partnership project 2 " alliance (3GPP2).3GPP and 3GPP2 document are publicly available.For the sake of simplicity, specifically describing the notice that is used for UMTS below transmits and reception technique.These technology can be used for the multimedia broadcast multicast services (MBMS) among the UMTS.

In UMTS, indicator channel (PICH) is used to send Paging Indicator to the wireless device of free time.Idle wireless device is to have registered to system and with the wireless device of idle pulley or the work of PCH pattern.The Paging Indicator that is used for each idle wireless device indicates whether to send message for wireless device on paging channel (PCH).PCH is the transport channel that is transmitted in secondary Common Control Physical Channel (S-CCPCH).The Paging Indicator of the wireless device monitors PICH that each is idle.If these Paging Indicators are set as ' 1 ', then wireless device processes S-CCPCH is any message that wireless device sends to check.Key property such as the indicator channel of PICH and MICH is, loaded information is very short and be uncoded on these channels, therefore can be received very apace and translate.

Fig. 2 A shows the form of the PICH among the UMTS.PICH is divided into frame, and the duration of every frame is 10 milliseconds (ms).System frame number (SFN) by 12 bits that transmit simultaneously on main CCPCH (P-CCPCH) is discerned every frame.SFN is reset to 0 in particular moment, and every thereafter frame adds one, and to unroll after reaching maximum 4095 be zero.

Each idle wireless device is assigned with paging occasions, and the paging occasions of this distribution is the particular frame that wireless device can receive its Paging Indicator therein.The paging occasions of each wireless device was separated by the time interval that is called as DRX (discontinuous receiving mode) cycle.Can be configured DRX cycle for each wireless device, and 1.28 seconds typically.Usually, DRX cycle can be from 80 milliseconds (ms) to 5.12 seconds range, perhaps from 8 frames to 512 frame range.Based on the Several Parameters that comprises IMSI International Mobile Subscriber Identity (IMSI), for each wireless device is determined paging occasions, wherein IMSI is the unique identifier of each wireless device.The different radio equipment that has different IMS I can be assigned with different paging occasions, even they have identical DRX cycle.In some other systems that support the slotted mode paging, the DRX cycle of UMTS and frame correspond respectively to slot cycle and time slot.

Fig. 2 B shows the form of the frame of PICH.Each PICH frame comprises 300 bits, and they are marked as b ₀To b ₂₉₉288 bits of front are used to Np Paging Indicator, and last 12 bits are preserved for other purposes.Paging Indicator number in each PICH frame can be by system configuration, and can adopted value 18,36,72 or 144.Each Paging Indicator is to send with the 288/Np successive bits in the PICH frame, and wherein 288/Np can adopted value 16,8,4 or 2.If Paging Indicator equals ' 1 ', the 288/Np bit all is set as ' 1 ', and if Paging Indicator equal ' 0 ', the 288/Np bit all is set as ' 0 '.Np Paging Indicator is sent out from 0 to Np-1 Np Paging Indicator position (not shown Fig. 2 B) in sequence number.

Each idle wireless device is associated with Paging Indicator in each paging occasions.The Paging Indicator of each wireless device is sent out in following definite position:

Wherein SFN is the system frame number of paging occasions;

PI＝(IMSI div 8192)mod Np；

 x  rounds operator downwards, and it provides the relative x next one lower integer value;

Mod represents the modulo operation symbol; And

q _pIt is the position of the Paging Indicator in the paging occasions.

Shown in equation (1), for given wireless device, the position of Paging Indicator changes between the possible position of Np based on the SFN of paging occasions.Like this, according to the SFN of paging occasions, wireless device will need to handle different positions, to obtain its Paging Indicator.

Equation (1) is also indicated the non-overlapping sequence (perhaps PICH sequence) that can form Np Paging Indicator at the most.Each PICH sequence is associated with different PI value, because in order to calculate PI's and to the operation of Np delivery, PI can be from 0 to Np-1 range.The ad-hoc location that is used to send Paging Indicator in each PICH sequence and the every frame (perhaps each SFN) is associated.Np PICH sequence is non-overlapped, wherein in any frame, do not have two PICH sequences to use same Paging Indicator position.In fact, for PI=1 to Np-1, the different shifted version of the PICH sequence that this (Np-1) individual PICH sequence only is PI=0 (by to the Np delivery).

Two wireless devices can be mapped to same PI value based on their IMSI.Then, these two wireless devices will have identical PICH sequence, and their Paging Indicator position will be overlapping in every frame.If these two wireless devices also have identical paging occasions, then their Paging Indicator can be in identical frame, and is sent out in position identical in every frame.If a plurality of Paging Indicators are mapped to identical position, if any one in these Paging Indicators equals ' 1 ' so, then in this position transmission value ' 1 ', if all Paging Indicators all equal ' 0 ', then in this position transmission value ' 0 '.For two wireless devices with identical PICH sequence and paging occasions, whenever be that a wireless device is provided with Paging Indicator, another wireless device also detects this Paging Indicator with (may be mistakenly), and will handle PCH to check beep-page message.

In UMTS, MBMS indicator channel (MICH) is used to send MBMS notification indicator (perhaps being called notification indicator simply), and the MBMS notification indicator indicates whether just to go up at MBMS point-to-multipoint control channel (MCCH) to send message.MCCH is a transfer channel, and it also is carried among the S-CCPCH.The message that sends on MCCH comprises the information that allows wireless device to receive MBMS point multipoint message traffic channel (MTCH).This information can be indicated, and for example, which service is available, the MTCH that how to decode, and whether soft merging is feasible or the like.MTCH is a transfer channel, the content of its bearer service data or service.

The form of MICH is similar to the PICH form shown in Fig. 2 B.Each MICH frame comprises 300 bits, and they are marked as b ₀To b ₂₉₉Front 288 bits are used to Nn notification indicator, and last 12 bits are retained.Notification indicator number (Nn) in each MICH frame can be by system configuration, and can adopted value 18,36,72 or 144.Each notification indicator is to be sent out in the 288/Nn successive bits in the MICH frame, and wherein 288/Nn can adopted value 16,8,4 or 2.Nn notification indicator is sent out from 0 to Nn-1 Nn designator position in sequence number.Can also use last 12 bits in each PICH frame to send notification indicator.

Each multicast/broadcast is assigned with specific notification indicator, as long as send message for serving on MCCH, just notification indicator is set as ' 1 '.The notification indicator of all services (or " required service ") that this wireless device of each wireless device monitors is required.As long as the notification indicator of required service is set up, the just further treatment S-CCPCH of wireless device is to look for the message that this service sends.

Can be on MICH the notification indicator of all services (or " service that is supported ") of supporting of transmitting system, to reach following target:

During each wake-up period, wake up with Paging Indicator and the notification indicator that receives all required services for each idle wireless device, make recovery time minimum, thereby make the power consumption minimum;

Make owing to the overlapping false alarms that cause of notification indicator that are used for different services are minimum; With

For all services that is supported, make the delivering power minimum of notification indicator.

For PICH, false alarm occurs in wireless device and will detect when becoming the Paging Indicator that itself is provided with for the Paging Indicator of another wireless device setting mistakenly.For MICH, false alarm occurs in wireless device and will detect when becoming the notification indicator that required service is provided with for the notification indicator of unwanted service setting mistakenly.Under any circumstance, false alarm causes PCH or the MCCH of wireless device processes for the disabled message of this wireless device, and this consuming cells electric power has also shortened stand-by time.

For PICH, if the idle wireless device that exists more than the number of available Paging Indicator position, and the Paging Indicator of a plurality of wireless devices mapping and overlapping onto on the identical position, false alarm is inevitable.Yet for several reasons, the false alarm of PICH does not have a negative impact to performance.The first, each wireless device typically receives only paging seldom, so the Paging Indicator of each wireless device seldom is set up, error-alert degree seldom.The second, not that all wireless devices that are mapped to identical PICH sequence all have overlapping Paging Indicator, because their paging occasions may be different, this constitutes another yardstick of distinguishing wireless device.The 3rd, wireless device typically needs to detect as far as possible apace their Paging Indicator, and uses the active detecting algorithm usually, and this algorithm may declare mistakenly that Paging Indicator is set up and reality is not this situation.The 4th, because PICH only is subjected to idle wireless device monitors,, and the service reception there is not adverse effect so the false alarm of PICH is only influential to battery life.

For MICH, if the quantity that outnumbers available notification designator position of the service that is supported, false alarm also is inevitable.Yet the false alarm of MICH may be more harmful than the false alarm of PICH.For the wireless device that does not also receive service, the influence of the false alarm of MICH may cause some extra battery electric power consumption.For receiving service and can not parallel receive MCCH and the wireless device of MTCH, false alarm causes wireless device processes MCCH and does not handle MTCH, and causes the loss of data of MTCH.

In order to reach first target of notification indicator above-mentioned, each service can be assigned with notification indicator in every frame.If on MCCH, send message for service, the notification indicator that then is used for this service is set as ' 1 ' in sufficiently long period, even also can receive the notification indicator with good detection probability so that have the wireless device of the longest possibility DRX cycle.

Fig. 3 shows the transmission on exemplary PICH, MICH, MCCH and the MTCH.The Paging Indicator that is used for each idle wireless device is sent out on PICH in the paging occasions of wireless device, shown in Fig. 3 top.The notification indicator that is used for each service is sent out at every frame of MICH, and is set as identical notice value (' 1 ' or ' 0 ') during whole modification time section.The modification time section can represent wherein " critical " signaling information can the reformed time interval, and critical signaling information is in order to receive the needed information of MBMS content.Usually, signaling information can be information and/or the service information specific that depends on service.

The modification time section is selected as long enough, so that all wireless devices can detect at least one notification indicator that sends reliably on MICH during the modification time section.The DRX cycle wireless device shorter than modification time section can read MICH during the paging occasions in each DRX cycle.DRX cycle can be waken up between paging occasions to read MICH than modification time segment length's wireless device.The modification time section can be selected as being equal to or greater than predetermined minimum duration (for example, 2 seconds), does not need to wake up too frequently so that have the long wireless device of DRX cycle.According to the configuring condition of DRX cycle and modification time section, wireless device may can read the one or more notification indicator that are used for each required service in each modification time section.

If send the notification indicator that is used for all services that are supported in each MICH frame, then unique level of dimension is the number (Nn) of a designator position in the MICH frame.If it is position that notification indicator is determined in each service that equation (1) is used in every frame, the notification indicator that then is used for having any two services of identical PI value can be overlapping at every frame.The false alarm of MICH then will be subjected to being used for the overlapping control of notification indicator of different services.If for service sends notice, then, will detect this notice mistakenly, and can handle MCCH interested all wireless devices of any other service of the PICH sequence that is mapped to equation (1) definition.This can cause the false alarm probability of MICH to uprise, and this does not wish to take place.

For the probability of the false alarm that reduces MICH, the position randomization of notification indicator that can be by making random sequence forms the sequence (perhaps random sequence) of a large amount of notification indicator.This randomization can realize in every way, for example, and by using hash function, PN generator or the like.For the sake of clarity, below several schemes that are used to generate random sequence are described.

In first randoming scheme, form random sequence based on hash function, hash function is based on the identifier of random sequence, and each random sequence is mapped to random site in every frame.Each random sequence is associated with different NI value, and the NI value can be from 0 to G-1 range, and wherein G is a parameter of determining possible random sequence quantity.

For each random sequence, the position of the notification indicator in every frame can followingly be determined:

， Eq(2)

Wherein C is a constant, will illustrate below;

 represents XOR (XOR) operation by turn; And

q _N1It is the position of the notification indicator in this frame.

Parameter G can be selected as power bigger in the two, and further compromise based between the probability of acquiescence conflict between the notification indicator of computation complexity and different services.The acquiescence conflict is meant the always shared identical position of the notification indicator of random sequence.In one embodiment, G is selected as G=2 ¹⁶, NI is the value of 16 bits, and has 2 ¹⁶Plant possible random sequence.

Constant C can be defined as, and is for example, as follows:

Eq(3)

Usually, constant C can be defined as making that C and G are relatively prime numbers.

Each service is discerned by service identifier, and service identifier can be temporary transient horde identification (TMGI).Therefore service can with wireless device by their IMSI by the identical mode of unique identification, discern uniquely by their TMGI.Each service can be mapped to specific NI value based on its TMGI, and is for example, as follows:

Eq(4)

Usually, each service can be mapped to specific NI value based on any function of service identifier.For example, this mapping can be based on function f (x)=(x+  x/G + x/G ²+ x/G ³ ...) modG, wherein x is a service identifier, and f (x) is the NI value.Also can use other function that service identifier is mapped to the NI value.

Hash function shown in the equation (2) carries out scrambling with the function of service identifier (perhaps NI) to the function of SFN, is associated with different random site with the notification indicator of guaranteeing different services in different frames.In hash function, use C and G, guarantee that the probability that all designator positions in every frame are assigned to each service equates.

From the viewpoint of complexity, the advantage of the hash function in the equation (2) is that it can directly calculate based on SFN and NI value, need not be in idle every frame clock for wireless device and trigger the PN generator.q _N1Each value can be with three multiplication, an xor operation, the truncation of modulo operation calculates several times.

In second randoming scheme, form random sequence based on the hash function of the hash function of similar PICH.Each random sequence is associated with different N I value, and the NI value can be from 0 to G-1 range.For each random sequence, the position of the notification indicator in every frame can followingly be determined:

， Eq(5)

Q wherein _N2It is the position of the notification indicator in the frame.

Hash function shown in the equation (5) also carries out scrambling with the function of service identifier to the function of SFN, is mapped to diverse location with the notification indicator of guaranteeing different services in different frame.Hash function shown in the equation (5) uses the function of the SFN different with the hash function shown in the equation (2).q _N2Each value can pass through four sub-additions, twice multiplication and several times truncation calculate.

In the 3rd randoming scheme, the PN generator based on select different random designator position for each random sequence in different frame forms random sequence.The selection of designator position can in all sorts of ways and realize at random.For the sake of simplicity, specific embodiment is described below.For this embodiment, the PN generator is to realize with the linear feedback shift register of 16 bits (LFSR), and this LFSR realizes the generator multinomial of selection.This generator multinomial can be, for example, and x ¹⁶+ x ¹²+ x ³+ x+1.The realization of linear feedback shift register is known in the present technique field, no longer describes herein.(perhaps upset) is zero as long as SFN unrolls, and shift register just is reset to predetermined nonzero value.The content of shift register is not that any wireless device or any service are peculiar at any time.Therefore each base station can keep a PN generator to be used for the service that all are supported.

Each random sequence (and then each service) is associated with different N I value, and the NI value is from 0 to G-1 range.For each random sequence, the position of notification indicator can followingly be determined in every frame:

Eq(6)

Wherein r is the mediant with 16 bit-binary of PN generator generation; And

q _N3It is the position of the notification indicator in the frame.

Equation (6) indication the 3rd randoming scheme need not be used to the constant C of hash function in equation (2) and (5).

Each bit of 16 bit binary number r can be determined based on the state of shift register and the NI value of random sequence.Each bit i of number r can pass through, and for example, following operation is determined:

1. clock triggers the PN generator once, to upgrade the content of shift register.

2. between the update content of shift register and NI value, carry out AND operation by turn, to generate the numerical value s of 16 bits.

3. all 16 bits of logarithm value s are carried out deliverys-2 summation, with binary numerical value of the bit i that obtains several r.

The setting of aforesaid operations is performed 16 times, and each bit in 16 bits of logarithm r is carried out once.Like this, for every frame, shift register is triggered 16 times by clock.Be in every frame of dormancy for wireless device, the PN generator is also triggered by clock, so that the PN generator is in correct state.Independent PN generator can be used to generate all G random sequences.

For the above embodiments, because the linear feedback shift register of use 16 bits is used for the PN generator and every frame clock triggers the PN generator 16 times, the length of random sequence is 4096 frames.The long or short random sequence of length can obtain by the PN generator that use has more or less bit.The length of the random sequence possible modification time section with the longest at least is the same long.

In another embodiment of the 3rd randoming scheme, different random sequences is associated with the different seeds of linear feedback shift register.Therefore, these random sequences are mapped to the diverse location on the PN sequence that is generated by the PN generator.For example, can be by (for example with the seed that is associated, as long as it is zero that SFN unrolls) initialization PN generator, every frame clock triggers the PN generator once, operate to obtain the designator position of this frame with content execution delivery-Nn (modulo-Nn), generate each random sequence shift register.For this embodiment, each random sequence that the PN generator is preserved for generating.In another embodiment, can be by (for example reseting the PN generator, as long as it is the zero predetermined value that just resets to that SFN unrolls), every frame clock triggers the PN generator once, mask value with random sequence is carried out XOR (exclusive-OR) to the content of shift register, and the result of xor operation is carried out delivery-Nn operate to obtain the designator position of this frame, generate each random sequence.For this embodiment, different random sequences is associated with different mask value, and independent PN generator can be used to generate all random sequences.Also can use the PN generator otherwise to generate random sequence.

Fig. 4 shows two random sequence X and the Y that notification indicator has random site.These two random sequences can use hash function or PN generator to generate.Random sequence X uses the NI value of X to generate, and random sequence Y uses the NI value of Y to generate, and wherein X and Y can be respectively 0 to the interior any value of G-1 scope.

For easy, Fig. 4 shows the situation that 8 designator positions are arranged in Nn=8 and the every frame.For each random sequence, notification indicator is sent out at random site in every frame.For example shown in Figure 4, random sequence X and Y conflict and their notification indicator are only overlapping in frame n, and not overlapping in other frame shown in Figure 4.If only there is the notification indicator of a random sequence to be set as ' 1 ', then only read under the situation of the notification indicator that sends among the frame n at wireless device, wireless device can be added up false alarm.If wireless device reads the notification indicator that sends in any other frame, perhaps wireless device reads a plurality of notification indicator, and wireless device will can not added up false alarm.Wireless device can be to being that detected all notification indicator of each required service are carried out AND, and and if only if the notification indicator of all detections when being set up, just can be handled MCCH.Yet for fear of owing to detecting the wrong signaling information of losing, under the situation that the notification indicator of any detection is set up, perhaps under the situation that the notification indicator of certain quantity or percentage is set up, wireless device can be handled MCCH.

Fig. 5 shows by the base station and carries out the processing 500 that is used for the notification indicator of the broadcasting supported the base station or multicast services with transmission.The base station can be with map of services to random sequence, the corresponding random sequence (program block 512) of each service.This can by with the designator of each service (for example, TMGI) be mapped to the NI value and realize, for example, shown in equation (4).The base station is based on the identifier or the NI value of hash function (for example, shown in equation (2) or (5)) or PN generator (for example, shown in equation (6)) and this service, for each service generates random sequence (program block 514) then.No matter how random sequence generates, each random sequence is associated with the ad-hoc location that is used in every frame transmission notification indicator.The position of the notification indicator of each random sequence is randomized with respect to the position of the notification indicator of each residue random sequence in the different frame.

Notice value (' 0 ' or ' 1 ') (program block 516) is determined in each service of each modification time Duan Zhongwei in the base station.For each service, the notification indicator of all frames is arranged to the notice value of the service in this modification cycle in the base station in the modification time section.The base station also is mapped to the definite indicator value that will send in each position of same position for a plurality of notification indicator that are used for a plurality of services.Under any circumstance, the notification indicator (program block 518) that is used for each service is transmitted at the random site of being determined by the random sequence of this service in the base station.The Paging Indicator that is used for each idle wireless device and on the position of being determined by the PICH sequence of wireless device, is transmitted also in distributing to each frame of wireless device in the base station on PICH.

Fig. 6 shows by wireless device and carries out to receive the processing 600 of the required notification indicator that is used at least one service of wireless device.Wireless device with the similar mode in base station, be that each service determines random sequence (program block 612).Wireless device is also determined the frame or the paging occasions (program block 614) of paging receiving designator.For the every frame in these frames of reviving, wireless device is receiving the notification indicator (program block 616) that is used for each service on the position of being determined by the random sequence that is used to serve on the MICH.Wireless device also on PICH, on the determined position of PICH sequence by wireless device, is himself paging receiving designator (program block 618).

Wireless device can select based on, for example, the false alarm probability of expectation reads any amount of notification indicator that is used for each service.Wireless device can be waken up more continually than its DRX cycle and more manyed notification indicator to receive, thereby the probability of false alarm is lower.Under any circumstance, wireless device based on should serve all notification indicator that receive at this modification time Duan Zhongwei, is the definite notice value (program block 620) of each service in each modification time section.

The randomization of the designator position of random sequence causes temporal extra dimension.This randomization guarantees that further the conflict that is used between the different notification indicator of serving is evenly distributed among all services, and uncorrelated between any service in these services.The notification indicator overlapping possibility on whole modification time section that is used for two different services is minimized.Wireless device can be used for a plurality of notification indicator of this service with detection by repeatedly read MICH during the modification time section, reduces the probability of the false alarm of given required service.If the notification indicator of all detections is set up, then wireless device can be handled MCCH.The notification indicator that detects hardly may be overlapping with the notification indicator that is used for any other service that system supports.The probability of false alarm, i.e. the notification indicator of all detections is set as ' 1 ' possibility by some other services, and is lower, and depends on the load on the MICH.Can reduce the probability of false alarm by reading more notification indicator of required service.By reading all notification indicator of required service, for example, receive effectively under the situation of service at wireless device, wireless device can be realized low-down false alarm probability.

False alarm performance to three above-mentioned randoming schemes is analyzed.This each notification indicator of analysis hypothesis can be detected, and without any physical layer error and because the overlapping any mistake that causes between the notification indicator of different services.For easy, the designator position that this analysis also supposes to be used for each service is a completely random, and in the different frame between two notification indicator overlapping probability be fully independently.

The notice load of system is represented as P _Load, represent MICH to go up given notification indicator and be set as ' 1 ' probability.Number N in the detected notification indicator of each each required service of modification time Duan Zhongwei _NiExpression.For each service, notification indicator is set as identical notice value in whole modification time section.If notice value ' 1 ' is sent out the notice with the indication required service, then is given detected all N of required service _NiIndividual notification indicator will equal ' 1 '.If N _NiIn the individual detected notification indicator any one equals ' 0 ', then to be considered to be that required service sends to notice value ' 0 ', and ' 1 ' the advise of same designator of equaling that is detected is considered to be configured to conflict with the notification indicator of other service.In order to add up the detection mistake of possible physical layer, if at least two detected notification indicator equal ' 0 ', detection algorithm can the value of making an announcement ' 0 ', otherwise detection algorithm can the value of making an announcement ' 1 '.For this detection algorithm, if N at least _Ni-1 detected notification indicator is indicated the existence of notice mistakenly, then false alarm can take place.

For above-mentioned detection algorithm, for given service, the probability P of false alarm _FA ^ServiceCan be expressed as:

$P_{\mathrm{FA}}^{\mathrm{service}}=\underset{k=N_{\mathrm{ni}}-1}{\overset{N_{\mathrm{ni}}}{\mathrm{\Σ}}}\left(\begin{array}{c}{N}_{\mathrm{ni}}\\ k\end{array}\right)\×(P_{\mathrm{load}}{)}^k\×(1-P_{\mathrm{load}}{)}^{N_{\mathrm{ni}}-k}$ Eq(7)

Wherein $\left(\underset{k}{N_{\mathrm{ni}}}\right)$ Expression N _NiThe various combination number of the notification indicator of the k among the individual notification indicator.If wireless device is to a plurality of (N _Ser) service is interested, the false alarm probability P of wireless device then _FA ^DeviceCan be expressed as:

$P_{\mathrm{FA}}^{\mathrm{device}}=1-(1-P_{\mathrm{FA}}^{\mathrm{service}}{)}^{N_{\mathrm{ser}}}$ Eq(8)

Object computer emulation is to determine the false alarm probability with the given wireless device of above-mentioned three kinds of randoming schemes.Following parameter value is used to emulation: Nn=144, G=2 ¹⁶, N _Ni=5, and N _Ser=10.Table 1 shows under the different situation of the notification payload of system, the false alarm probability of the wireless device of every kind of randoming scheme.Simulation result shows that these three kinds of randoming schemes all provide than the lower false alarm probability of not randomized situation (for example, using equation (1)).Simulation result shows that also the likelihood ratio of the false alarm that uses hash function shown in the equation (2) and the PN generator shown in the equation (6) is lower.

Table 1 false alarm probability

	P load≈5％	P load≈10％	P load≈20％	P load≈30％
					Not randomization	38.4％	62.2％	86.6％	94.4％
With equation (2) randomization	0.14％	0.84％	6.39％	19.6％
					With equation (5) randomization	7.7％	16.5％	38.1％	57.8％
With equation (6) randomization	0.02％	0.36％	4.68％	16.1％

PICH uses Quadrature Phase Shift Keying (QPSK) to be used for Paging Indicator.Each Paging Indicator is represented with one group of modulation symbol.Use QPSK, each modulation symbol is transmitted with predetermined power level.Each modulation symbol uses the delivering power of equal number, no matter the value that sends for Paging Indicator is ' 0 ' or ' 1 '.

MICH can be designed as and uses On/Off keying (OOK) to be used for notification indicator, and this can reduce the amount of the delivering power that is used for MICH.Use OOK, notification indicator value ' 1 ' is transmitted with the predetermined electric power level, and notification indicator value ' 0 ' is transmitted (that is, not being transmitted) with zero energy.The delivering power of the notification indicator that sends with OOK should be two times of delivering power of the notification indicator that sends with QPSK, and is identical to realize the two detection performance of OOK and QPSK.Determine that by MICH load total delivering power of MICH, MICH load are the average marks that is set as ' 1 ' notification indicator in given frame.If the MICH load is less than 50%, then realized the minimizing of total delivering power of MICH.The MICH load may be less than 50%, so that avoid the false alarm ratio height of wireless device.Like this, use OOK that total delivering power of the detection performance MICH identical with QPSK is reduced.

Fig. 7 shows the block diagram of the embodiment of base station 110x and wireless device 120x.At base station 110x, encoder 710 receives the business datum that is used for paging and other message, handles (for example, encode, interweave and sign map) business datum, and generates modulation symbol.The modulation symbol of 712 pairs of each physical channels of modulator (for example, PICH, MICH, and S-CCPCH) is carried out channelizing, spread spectrum, scrambling or the like, and stream of data chips is provided.Delivery unit (TMTR) 714 is regulated (for example, conversion is with simulation, amplification, filtering, and up-conversion) data chips, and generates down link signal, and this signal transmits by antenna 716.

At wireless device 120x, antenna 752 is from base station 110x receiving downlink signal, and the signal that receives is offered receiving element (RCVR) 754.Receiving element 754 is regulated the signal that (for example, filtering, amplification, and down-conversion) receives, signal digitalized with after regulating, and data sample is provided.Demodulator (Demod) 756 deal with data samples also provide sample to estimate.Demodulator 756 is such according to controller 760 commanders', further carries out the detection to notification indicator and Paging Indicator.Decoder 758 is handled (for example, go mapping, deinterleaving, and decode) sign estimation, and the decoded data of the base station message that 110x is sent is provided.

Controller 720 and 760 is commanded the operation on base station 110x and the wireless device 120x respectively.Controller 720 and 760 can also be carried out the transmission that is used for notification indicator and Paging Indicator and the various functions of reception respectively.For example, controller 720 can be carried out the processing shown in Figure 5 500 that is used to transmit notification indicator, and controller 760 can be carried out the processing 600 of the Fig. 6 that is used for receipt notification indicator.Memory cell 722 and 762 is stored data and the program code that is used for controller 720 and 760 respectively.Timer 764 provides temporal information, and this temporal information controlled device 760 is used to determine to wake up handle the moment of PICH and MICH.

Notice transmission and the reception technique described herein can be realized in every way.For example, these technology can realize with hardware, software or the assembly of the two.Realize that for hardware the processing unit that is used to transmit notification indicator can be at one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processing appts (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, be designed to carry out realization in the other electron component of function described herein or their assembly.The processing unit that is used for receipt notification indicator can also be realized in one or more ASIC, DSP etc.

Realize that for software notice transmits and reception technique can be realized with the module (for example, step, function etc.) of carrying out function described herein.Software code can be stored in the memory cell (for example, the memory cell 722 or 762 among Fig. 7), and is carried out by processor (for example, controller 720 or 760).Memory cell can be in processor inside or processor is outside realizes that in this case, it can be connected to processor communicatedly by known variety of way in the present technique field.

The above stated specification of disclosed embodiment provides and is used for making any those of skill in the art in present technique field can realize or use the present invention.Various modifications concerning these embodiment will be conspicuous for those those of skill in the art in present technique field, and the general principle of definition herein can be applicable to other embodiment, and can not break away from the spirit and scope of the present invention.Like this, the present invention will be limited to embodiment illustrated herein, but consistent with the broadest scope that meets principle disclosed herein and novel features.

Claims (41)

1. one kind is transmitted the method for notifying in communication system, comprising:

A plurality of map of services are arrived a plurality of random sequences, the corresponding random sequence of each service, each random sequence is associated with the position of transmission notification indicator in every frame, and wherein the position of the notification indicator of each random sequence is randomized with respect to the position of the notification indicator of each all the other random sequence; With

In the determined position of the random sequence that is used for described service, transmit the notification indicator that is used for each service.

2. the method for claim 1 also comprises:

Based on the identifier of hash function and described a plurality of services, generate a plurality of random sequences.

3. the method for claim 1 also comprises:

Hash function based on comprising by first function of the frame number of the second function scrambling of service identifier generates a plurality of random sequences.

4. the method for claim 1 also comprises:

Identifier based on pseudo random number (PN) generator and described a plurality of services generates a plurality of random sequences.

5. the method for claim 1 also comprises:

Be identified for the notice value of each service; With

A plurality of notification indicator that will be used for each service are set as the described notice value that is used to serve.

6. method as claimed in claim 5, wherein, the notification indicator that described transmission is used for each service comprises:

In a plurality of successive frames, and, transmit a plurality of notification indicator that are used for each service in the determined position of the random sequence that is used for described service.

7. the equipment in the communication system comprises:

Controller, it is used for a plurality of map of services to a plurality of random sequences, the corresponding random sequence of each service, each random sequence is associated with the position of transmission notification indicator in every frame, and wherein the position of the notification indicator of each random sequence is randomized with respect to the position of the notification indicator of each all the other random sequence; With

Processor, its notification indicator that is used for being used for each service is mapped to the determined position of the random sequence that is used for described service.

8. equipment as claimed in claim 7, wherein, described controller also is used for based on hash function or pseudo random number (PN) generator, and based on the identifier of described a plurality of services, generates a plurality of random sequences.

9. equipment as claimed in claim 7, wherein, described controller also is used for being identified for the notice value of each service, and a plurality of notification indicator that will be used for each service are set as the notice value that is used for described service.

10. equipment as claimed in claim 9 also comprises:

Reflector, it is used in a plurality of successive frames and in the determined position of the random sequence that is used for described service, transmits a plurality of notification indicator that are used for each service.

11. equipment as claimed in claim 7, wherein, described a plurality of services are broadcasting and multicast services.

12. the equipment in the communication system comprises:

Be used for the device of a plurality of map of services to a plurality of random sequences, the corresponding random sequence of each service, each random sequence is associated with the position of transmission notification indicator in every frame, and wherein the position of the notification indicator of each random sequence is randomized with respect to the position of the notification indicator of each all the other random sequence; With

Be used for transmitting the device of the notification indicator that is used for each service in the determined position of the random sequence that is used for described service.

13. equipment as claimed in claim 12 also comprises:

Based on hash function or pseudo random number (PN) generator, and generate the device of a plurality of random sequences based on the identifier of described a plurality of services.

14. equipment as claimed in claim 12 also comprises:

Be used to be identified for the device of the notice value of each service;

The a plurality of notification indicator that are used for being used for each service are set as the device of the notice value that is used for described service; With

Be used at a plurality of successive frames and be used for transmitting on the determined position of random sequence of described service the device of a plurality of notification indicator that are used for each service.

15. a method that transmits notice in communication system comprises:

Based on the identifier of frame that sends notification indicator therein and service, determine to send the position of the notification indicator that is used for described service, described identifier is used to make position randomization in described frame of described notification indicator; With

The notification indicator that is used for described service is transmitted in described position in described frame.

16. method as claimed in claim 15, wherein, the position of described definite transmission notification indicator is based on following equation:

Wherein C and G are two constants;

SFN is the system frame number of described frame;

Nn is the number of the available position in the described frame;

NI is the determined value of the identifier of described service;

 represents XOR (XOR) operation by turn;

Mod represents the modulo operation symbol;

 x  rounds operator downwards, and it provides the low integer value of the next one of x; And q is the position of the notification indicator in the described frame.

17. method as claimed in claim 15, wherein, described transmission notification indicator comprises:

Use the On/Off keying to transmit the notification indicator that is used for described service on the described position in described frame.

18. method as claimed in claim 15 also comprises:

A plurality of notification indicator that will be used for described service are set to the notice value of described services selection;

Based on the identifier of described service, determine the random site in a plurality of frames; With

Transmit a plurality of notification indicator that are used for described service on the random site in described a plurality of frames.

19. the equipment in the communication system comprises:

Be used for based on the definite device that sends the position of the notification indicator that is used for described service of the identifier of frame that sends notification indicator therein and service, described identifier is used to make position randomization in described frame of described notification indicator; With

Be used for described position in described frame and transmit the device of the notification indicator that is used for described service.

20. equipment as claimed in claim 19, wherein, the described device that is used for the position of definite transmission notification indicator is based on following equation:

Wherein C and G are two constants;

SFN is the system frame number of described frame;

Nn is the number of the available position in the described frame;

NI is the determined value of the identifier of described service;

 represents XOR (XOR) operation by turn;

Mod represents the modulo operation symbol;

 x  rounds operator downwards, and it provides the low integer value of the next one of x; And q is the position of the notification indicator in the described frame.

21. a method that receives the notice of at least one service in communication system comprises:

Be identified at least one random sequence of at least one service, the corresponding random sequence of each service, each random sequence is associated with the position of transmission notification indicator in every frame, and wherein the position of the notification indicator of each random sequence is randomized with respect to the position of the notification indicator of each all the other random sequence; With

In the determined position of the random sequence that is used for described service, receive the notification indicator of each service that is used for described at least one service.

22. method as claimed in claim 21 also comprises:

Determine the frame of paging receiving designator therein; With

Receive notification indicator that is used for described at least one service and Paging Indicator in the determined frame.

23. method as claimed in claim 21 also comprises:

Obtain at least two notification indicator in each modification time section of each service that is used for described at least one service, the described notification indicator that is used for each service is set as identical notice value in each modification time section; With

Based on described at least two notification indicator of being obtained in the modification time section that is used for described service, in each modification time section, be identified for the notice value of each service.

24. method as claimed in claim 21 also comprises:

Based on the probability of required false alarm, be identified for the number of the described notification indicator that will receive in each modification time section of each service.

25. method as claimed in claim 21 also comprises:

Identifier based on hash function and each service generates at least one random sequence.

26. method as claimed in claim 21 also comprises:

Hash function based on comprising by first function of the frame number of the second function scrambling of service identifier generates at least one random sequence.

27. method as claimed in claim 21 also comprises:

Identifier based on pseudo random number (PN) generator and each service generates at least one random sequence.

28. method as claimed in claim 21 also comprises:

In every frame, be identified for the position of the notification indicator of each service based on following equation:

Wherein C and G are two constants;

SFN is a system frame number;

Nn is the number of the available position in the described frame;

NI is the determined value of the identifier of described service;

 represents XOR (XOR) operation by turn;

Mod represents the modulo operation symbol;

 x  rounds operator downwards, and it provides the low integer value of the next one of x; And

Q is the position of the notification indicator in the described frame.

29. the equipment in the communication system comprises:

Controller, it is used for being identified at least one random sequence of at least one service, the corresponding random sequence of each service, each random sequence is associated with the position of transmission notification indicator in every frame, and wherein the position of the notification indicator of each random sequence is randomized with respect to the position of the notification indicator of each all the other random sequence; With

Demodulator, it is used for detecting the notification indicator of each service that is used for described at least one service on the determined position of the random sequence that is used for described service.

30. equipment as claimed in claim 29, wherein, described controller also can be used to determine the frame of paging receiving designator therein, and wherein said demodulator also is used for detecting notification indicator that is used for described at least one service and described Paging Indicator in the determined frame.

31. equipment as claimed in claim 29, wherein, described demodulator can be used to detect at least two notification indicator in each the modification time section that is used for described at least one each service of serving, and, in each modification time section, be identified for the notice value of each service based on described at least two notification indicator of being obtained in the modification time section that is used for described service.

32. equipment as claimed in claim 29, wherein, described controller also is used for based on hash function or pseudo random number (PN) generator, and based on the identifier of each service, generates at least one random sequence.

33. the equipment in the communication system comprises:

Be used to be identified for the device of at least one random sequence of at least one service, the corresponding random sequence of each service, each random sequence is associated with the position of transmission notification indicator in every frame, and wherein the position of the notification indicator of each random sequence is randomized with respect to the position of the notification indicator of each all the other random sequence; With

Be used on the determined position of the random sequence that is used for described service, receiving the device of the notification indicator of described at least one each service of serving.

34. equipment as claimed in claim 33 also comprises:

Be used for determining the device of the frame of paging receiving designator therein; With

Be used for receiving the notification indicator that is used for described at least one service of determined frame and the device of described Paging Indicator.

35. equipment as claimed in claim 33 also comprises:

Be used for obtaining the device of at least two notification indicator of each the modification time section that is used for described at least one each service of serving, the described notification indicator that is used for each service is set as identical notice value in each modification time section; With

Be used for being identified in each modification time section the device of the notice value of each service based on described at least two notification indicator of being obtained in the modification time section that is used for described service.

36. equipment as claimed in claim 33 also comprises:

Be used for based on hash function or pseudo random number (PN) generator and generate the device of at least one random sequence based on the identifier of each service.

37. a method that transmits notice in communication system comprises:

Be identified for a plurality of notification indicator of a plurality of services;

Described a plurality of notification indicator are mapped to a plurality of positions in the frame; With

Use the On/Off keying to transmit described a plurality of notification indicator.

38. method as claimed in claim 37, a plurality of notification indicator of wherein said transmission comprise:

With predetermined power level transmit first value notification indicator and

Transmit the notification indicator of second value with zero energy.

39. method as claimed in claim 38 also comprises:

The desired amt that has the notification indicator of first value in the frame is restricted to is less than 50 percent.

40. the equipment in the communication system comprises:

Be used to be identified for the device of a plurality of notification indicator of a plurality of services;

Be used for described a plurality of notification indicator are mapped to the device of a plurality of positions of frame; With

Be used to use the On/Off keying to transmit the device of described a plurality of notification indicator.

41. equipment as claimed in claim 40, the wherein said device that is used to transmit a plurality of notification indicator comprises:

Be used for predetermined power level transmit first value notification indicator device and

Be used for transmitting the device of the notification indicator of second value with zero energy.

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