CN103270806B - RACH process and power level for MTC device - Google Patents

Abstract

This document relates to the mobile device in digital cellular telecommunications network.Such as, this document relates to the request accessing channel from wireless device to the base station of digital cellular telecommunications network.Describe one or more exemplary method sent for controlling between wireless device and base station.One or more transmission at least include initially sending.One exemplary method comprises determining that the quality of the radio uplink between described wireless device and described base station, and described quality is based at least one parameter being associated with transmission before；The quality of described radio link determined by based on, is provided for controlling the control parameter of the transmission between wireless device and base station；And send described initial transmission.

Description

RACH process and power level for MTC device

Cross-Reference to Related Applications

This application claims the rights and interests of the european patent application 10 196 352.8 that December in 2010 submits on the 21st, by quoting Clearly entire contents is expressly incorporated herein.

Technical field

This document relates to the mobile station in digital cellular telecommunications network.Concrete, this document relates to from mobile station (MS) The request accessing channel to the base station (BS) of digital cellular telecommunications network.

Background technology

At GERAN (GSM (global system for mobile communications) EDGE (for the enhanced data rates of GSM evolution) radio Access network) in, mobile station (MS) uses RACH (RACH) to come to network request channel, such as, to exchange information, holds Line position updates or starts and connects.RACH, as logic channel, is sent by physical channel via access burst.Generally exist In GERAN network, at least one thing of the carrier frequency on uplink direction (i.e., from MS to Base Transceiver Station (BTS)) Reason channel (can be characterized by timeslot number and be referred to alternatively as time slot) is owing to RACH.Downlink direction is (that is, from BTS To MS) on respective channels can be the MS description that BCCH (BCCH), BTS use BCCH to be serviced to this BTS The mark of BTS, configuration and available feature.

Currently, the output used for the access burst sent by RACH is arranged to the maximum of MS and can use defeated Go out power, to maximize suitable BTS or the probability of base station (BS) of access burst arrival network.In the skill being incorporated by reference into Art specification 3GPP TS45.008 provides with the structure of RACH and access burst realize relevant details.

It is above-mentioned for selecting the scheme of output to have following impact: even if MS is close to its BTS attempted to connect to, MS also uses full power.This causes unnecessary high output when can work as MS close to BS, thus causes on the radio interface Additional interference, increases the power consumption of MS, and produces potential receiver problem in a base station (due to the highest reception power Level).

Machine type communication (MTC) equipment (such as fixing equipment, such as intelligence instrument) can be located at apart from its serving BS (its Can be the nearest base station of communication network, but the most this situation) the most remote position.In addition to geographic distance, MTC Equipment may be located on shielding the position of radio net, such as, in the basement of building.Thus, equipment is with BS's " distance " (from the viewpoint of radio link) can be caused by geographic distance, and by the radio between equipment (MS) and BS Obstacle on path causes.Due to this bigger " distance ", and with same base apart from relative proximity of equipment compared with, MTC Equipment is likely to be of and is directed to, in the base station being received, the shortcoming that the received signal level of RACH is relatively low.This imbalance is usual The MTC device fixed is caused successfully to carry out the probability of channel access relatively low.

This document solves these problems.Specifically, this document solves by radio telecommunication network (such as, GERAN) Concrete base station provides the different mobile stations of service successfully to carry out the problem that the probability of channel access is balanced.

Summary of the invention

According to an aspect, describe for controlling the initial transmission of transmission in the up-link from wireless device to base station The method of (such as, access burst).Initial transmission can be transmission based on competition, it is meant that a subscriber equipment or wireless set Standby initial send that send with another subscriber equipment initial can at identical time slot and/or identical physical channel (such as, Public RACH) interior generation.This means that multiple subscriber equipment can (or in identical time slot) send initial simultaneously to base station Send.Can be characterized as not using the resource assigned to wireless device specially or distribute as ongoing company using initially sending Connect the transmission of the part of (such as GPRS Temporary Block Flow (TBF)).If be such as not received by the confirmation sent before, or Person connects (part whether the most initial transmission forms the process setting up this connection for request) without setting up, can Sequentially to send multiple initial transmission.

Initial transmission can be the GERAN access burst of use in GERAN.Generally upper of RACH (RACH) Send GERAN access burst.Access burst can include payload, synchronizing sequence bit and/or encrypting bit, described effective load Pocket includes tail bit.Access burst can be shorter than the time slot of bottom-layer network (such as, GERAN).In this case, the protection period can To be the length difference with the length of access burst of time slot.Thus, access burst can be differently configured from its length corresponding to time slot long The so-called normal burst of degree.In the case of GERAN, wireless device can be GERAN mobile station and/or base station can be GERAN base station.

Wireless device can be fixing equipment, such as, the intelligence instrument equipment installed at fixed position.This fixing nothing Line equipment may be mounted to that the position providing the low-qualityest radio link from wireless device to base station.Therefore, this Equipment is successfully transmitted the probability of access burst (that is, base station receive and transmission is successfully decoded) to base station can be reduced.Should note Meaning arrives, and fixing equipment can be to move slowly and/or the equipment of movement in finite region.Fixing equipment can be to maintain Timing Advance (TA) is for the equipment of the subsequent communications session in predetermined boundary.Predetermined boundary can be right Should be in the TA granularity of bottom-layer network.In an illustrative manner, in gsm, TA granularity makes the movement of 100m still can cause making Use identical TA.Thus, wireless device can be by moving less than the speed of threshold speed and/or wireless device can be less than region Move in the region of threshold value (such as, predetermined radius).

The method can include determining that the finger to the radio link quality in the up-link from wireless device to base station Show.Specifically, method can include determining that the quality of radio uplink.The quality of radio link can depend on from nothing Line equipment is to the distance of base station, and/or obstacle present on the radio uplink from wireless device to base station, and/or from Wireless device is to the interference of generation on the radio uplink of base station.In the document, the quality of radio uplink is also " distance " (for the angle of radio link) will be referred to as.Additionally, for determining the quality to radio uplink The method of instruction is equally applicable to determine the quality of radio uplink.

Can be based on for sending (such as, one or more in the up-link from wireless device to base station before Sending before burst) one or more (history) parameter of using determines the instruction of the quality to radio uplink (or quality of radio uplink).Thus, it is possible to transmission parameter based on history or before is come on estimating uplink The quality of radio link.One or more burst in up-link can be access burst and/or normal burst.Excellent Selection of land, this one or more burst is the normal burst sending from wireless device and being received by corresponding base station.

One or more (history) of sending use for the burst before one or more in up-link Parameter can be with the next item down or more: power level, Modulation and Coding Scheme or Timing Advance.That is, these are one or more Individual (history) parameter can have different types.As will be described in more detail, can be controlled for from wireless by base station Power level that equipment uses to the communication before base station and/or Modulation and Coding Scheme and/or Timing Advance, thus to nothing Line equipment provides the feedback of the quality to radio uplink.Generally, being successfully transmitted initial transmission, (it can be to access to dash forward Send out) after, this feedback only communication (it can relate to normal burst) set up period between wireless device and base station is available.

The combination that can use polytype (history) parameter determines the instruction of the quality to radio uplink (or quality of radio uplink).In one embodiment, determine wireless based on each type of (history) parameter The independent instruction of the quality on current source road, and determine overall instruction by combining multiple single instructions.In an illustrative manner, The instruction of this entirety may refer to show the independent instruction of the minimum mass of radio link or the biggest quality.It is alternatively possible to use The individually overall instruction being averagely used as radio link quality of instruction.It is described below for (going through based on a type of History) if parameter determines the drying method of individually instruction.These single instructions can be combined provide radio link quality Overall instruction.

Determine that quality or the instruction to quality may include that offer is in the up-link from wireless device to base station The power level before using is sent before one or more burst；And determine finger based on the power level before this Show.Power level before relatively low may indicate that relatively high quality, wherein, relatively high before power level permissible Indicate relatively low radio link quality.In an illustrative manner, the possible power level range that wireless device is used can With from Minimum Power Level to maximal power level.To the instruction of radio link quality can based on relative to maximum and/or Power level before Minimum Power Level.

Determine that the quality of radio uplink or the instruction to the quality of radio uplink may include that offer pin To in up-link one or more burst multiple before send use multiple before power level；Many to this Power level application filter before individual；And based on filtered multiple before power level determine instruction.Thus, Filter can be used to combine multiple parameters of same type.In an illustrative manner, filter can be with the next item down: has Or not there is the average filter of forgetting factor；Median filter；And maximum filter.

Power level before multiple can correspond to for the burst use sent before predetermined number Power level and/or the power level used during predetermined time interval.In an illustrative manner, it may be considered that for With communicate before base station during send multiple (N number of) burst use power level.Alternatively, or additionally, it may be considered that The power level used during multiple communication sessions.In a preferred embodiment, it is limited to use by the power level before multiple In being successfully transmitted (that is, sending out burst indicated by the confirmation such as sent, that received by base station by base station Send) power level.

Determine that the quality of radio uplink or the instruction to quality may include that offer is for from wireless device to base The Modulation and Coding Scheme (MCS) before using is sent before one or more burst in the up-link stood；And Instruction is determined based on the Modulation and Coding Scheme before this.In an illustrative manner, the robustness of MCS can be to radio link matter The instruction of amount, wherein, may indicate that relatively low quality compared with the MCS of robust, and less robust MCS may indicate that higher matter Amount.

By with use power level be used as (history) parameter similar in the way of, determine the radio in up-link The instruction of link-quality may include that to provide and sends use before for the multiple of one or more burst in up-link Multiple before Modulation and Coding Scheme.Can be specified this by the burst of predetermined number or predetermined time interval Transmission before multiple.Transmission before multiple may originate at the communication session before one or more.

Can based on during the communication session before one or more use one or more before modulation One or more bit rate of encoding scheme determines instruction.In this case, determine radio uplink quality Instruction may include that determine with multiple before the associated plurality of bit rate of Modulation and Coding Scheme；To the plurality of bit Speed application filter；And determine instruction based on filtered multiple bit rates.

Determine that radio uplink quality (instruction) may include that provide for from wireless device to base station up The Timing Advance before using is sent before one or more burst on link；And based on the timing before this Lead determines instruction or quality.Timing Advance is the instruction to the propagation delay from wireless device to base station, wherein, Gao Ding Time lead may indicate that low-quality radio link, vice versa.

By by the way of the most similar, determine that the radio link quality in up-link (instruction) may include that There is provided in up-link one or more burst multiple before send use multiple Timing Advances；To this Multiple Timing Advance application filters；And determine instruction based on filtered multiple Timing Advances.Determine on radio Downlink quality (instruction) may include that provide from base station send and at wireless device at receive burst reception signal electricity Flat.Thus, it is possible to use the signal level on the downlink from base station to wireless device to be used as the nothing in up-link The instruction of line electricity link-quality.Relatively low received signal level may indicate that the low-qualityest radio in up-link Link, vice versa.

It is furthermore possible to also provide at wireless device the minima of received signal level needed for access base station.Can be at net This minima of predetermined received signal level in network, and/or (such as, extensively it can be sent from base station to wireless device Broadcast).In such a case it is possible to difference based on received signal level Yu the minima of received signal level determines up-link On the instruction of radio link quality.

More specifically, determine that radio uplink quality (instruction) can also include: provide wireless device to be configured The maximum of the received signal level measured.This maximum can be predefined by network and/or send out to wireless device from base station Send (such as, broadcast).Specifically, can being somebody's turn to do at MS performance requirement defined in the specification (such as, 3GPP technical specification) of network Maximum (upper limit).It is then possible to carried out normalizing by the difference of the maximum of received signal level Yu the minima of received signal level Change the difference of received signal level and the minima of received signal level.Thus, it is possible to based on received signal level and reception signal The normalized difference of the minima of level determines instruction.

Method may comprise steps of: is provided for controlling to send from nothing based on radio link quality (instruction) Line equipment is to initial one or more control parameter sent of base station.This is used for one or more control controlling to send Parameter can be with the next item down or more: for the power level of the transmission of access burst；Re-transmission for access burst The power level increased；The number retried of permission for the re-transmission of access burst；After controlling two initially sent Supervention send between the back off time of waiting time or back-off intervals (wherein, follow-up initial transmission can be different from each other). Thus, it is possible to revise multiple control parameter, to control to send initial transmission.

Controlling parameter can be the power level sent, and the operation arranging control parameter may include that based on radio Downlink quality (instruction) revises (i.e. increase and/or reduce) power level.In an illustrative manner, if it is indicated that relatively Low-quality radio link, can arrange higher power level.Set power level can be used to send initially Send.After being not received by the confirmation to the initial transmission of transmission, the power level sending follow-up initial transmission can be increased. Generally send to wireless device from base station and confirm.

Controlling parameter can be in the case of being not received by the initial confirmation sent before sending, for initially The number retried of the permission of the re-transmission sent.Arrange control parameter can include coming based on radio link quality (instruction) The number retried that amendment (that is, increase and/or reduce) allows.Generally, it is allowed to the number retried be initially to send from first The number retried of the permission started counting up.

Controlling parameter can be back-off intervals (or idle time interval), its scope from lower back off time on keep out of the way Time.Lower back off time can specify the lower limit of the waiting time between the follow-up transmission of initial transmission, and upper back off time is permissible Specify the upper limit of waiting time between follow-up initial transmission.In other words, back off time may indicate that: is being not received by it In the case of the front initial confirmation sent, send the waiting time of initial transmission.

Initial parameter is arranged and can include increasing based on radio uplink quality (instruction) and/or reducing Back-off intervals.Specifically, it may modify the upper back off time of back-off intervals.In an illustrative manner, if it is indicated that phase To low-quality radio uplink, it is possible to use the relatively low upper back off time of back-off intervals.Can (alternatively Or in addition) revise the lower limit of back-off intervals similarly, i.e. descend back off time.The reality that can will use at wireless device Back off time elects the random number in back-off intervals as.

According to another aspect, describe for control in the up-link from wireless device to base station send include at the beginning of Originate and send (such as, access burst) in one or more interior method sent.For initial sending, wireless device and/or The possible embodiment of base station, the correlated characteristic with reference to described in this document.

The method may include that the current Timing Advance of the propagation delay providing instruction from wireless device to base station.Can With based on one or more timing advance used during the transmission before one or more of wireless device to base station Amount determines current Timing Advance.Specifically, normally can be dashed forward by being used for sending during one or more communication session One or more Timing Advance sent out determines current Timing Advance, or is come really by any other known way Fixed.

Method can include selecting to access Timing Advance based on current Timing Advance.Specifically, can will access Timing Advance is chosen to differ from zero.Accessing Timing Advance is for sending access request or just to base station from wireless device Originate the Timing Advance sent.

Select to access Timing Advance and may include that this is fixed from timing advance value Resource selection access Timing Advance Time advance value set scope deduct the length of protection period of initial transmission from current Timing Advance to current Timing Advance Degree.As noted above, the initial length sent can be shorter than the length of the time slot used in network.Length difference can be referred to as Protection period.In other words, the initial protection period sent can correspond to the number of symbols of every time slot and the initial payload sent The difference of number of symbols.

Thus, it is possible to the initial transmission maximum sent will be shifted to an earlier date current Timing Advance, and the most current minimum timing Difference between lead and the length of protection period.It will be noted that negative access Timing Advance is corresponding to having initially sending Effect ground postpones to access the absolute value of Timing Advance.

Can use and come from timing advance value Resource selection relative to the predetermined skew of current Timing Advance Access Timing Advance.For wireless device, this predetermined skew can be fixing.In other words, timing advance is accessed Amount can correspond to current Timing Advance and adds predetermined skew, and wherein, predetermined skew is less than the protection period Length.

Determine from the access of timing advance value Resource selection it is alternatively possible to use relative to the skew of current Timing Advance Time lead, wherein, skew is to select from the predetermined jump sequence of the skew belonging to wireless device.Can be by The predetermined jump sequence of skew is designed as: with one of the skew used for one or more other wireless device Or more predetermined jump sequence has the dependency of minimizing.

It is alternatively possible to randomly choose access Timing Advance from Timing Advance value set.

The method can also include using access Timing Advance to send initial transmission on uplink.This meaning : substitute with null fixing Timing Advance to send access burst, can select to access as described in this document and determine Time lead, to reduce the collision probability of multiple initial transmission.

The method is additionally may included at wireless device and receives the maximum using the wireless device being provided service by base station The instruction of Timing Advance.This maximum Timing Advance can by base station broadcast, and can be to currently being provided clothes by base station The instruction of the maximum delay spread of the wireless device of business.Thus, maximum Timing Advance can be size (that is, the geometry of community Size) designator.

Use this information, current Timing Advance can be determined based on the maximum Timing Advance received.Specifically, Current Timing Advance can correspond to maximum Timing Advance.By the way of similar, can be based on current Timing Advance Select to access Timing Advance with the maximum Timing Advance received.In an illustrative manner, can select to access timing to carry Front amount, so that the initial collision probability sent with other wireless devices can be reduced.To this end, assume that other wireless devices Send it with null Timing Advance initially to send.Alternatively, or additionally, can carry based on the maximum timing received The length of the payload that front amount regulation (such as, being increased or decreased) initially sends.By doing so it is possible, initial transmission can be reduced The probability of conflict.

According on the other hand, the wireless device being configured to communicate with base station is described.Wireless device can be configured to perform Any method described in this document and aspect.Additionally, wireless device can include any feature described in this document.

According on the other hand, describe software program.This software program can store (permissible on a computer-readable medium It is tangible or non-momentary), as being adapted to perform on a processor and perform when performing on the computing device Aspect described in this document and the instruction of feature.

According on the other hand, describe the storage medium including software program.This storage medium can be memorizer (such as RAM, ROM etc.), light medium, magnetizing mediums etc..This software program can be adapted to perform on a processor and when calculating The aspect described in this document and feature is performed when performing on equipment.

According on the other hand, describe a kind of computer program.This computer program can include when at meter The aspect described in this document and the executable instruction of feature is performed when performing on calculation equipment.

The specific aspect of this document includes the example below:

It is in one example, a kind of for controlling one or more method sent between wireless device and base station, One or more transmission at least include initially sending, and described method comprises determining that described wireless device and described base station Between the quality of radio uplink, described quality is based at least one parameter being associated with transmission before；Based on Determined by the quality of described radio uplink, be provided for controlling the control ginseng of the transmission between wireless device and base station Number；And send described initial transmission.

In one example, controlling parameter is power level.

Method can also include: be not received by the confirmation in one or more transmission one transmission it After, increase described power level for follow-up transmission.

Before any in the method for aspect, controlling parameter can be the number retried allowed.Arranging control parameter can To include: arrange back-off intervals；And back off time is elected as the random number in described back-off intervals.

Initial transmission can be access burst.

Before any in the method for aspect, for determine described radio uplink quality described at least one Parameter be with the next item down or more: power level, Modulation and Coding Scheme or Timing Advance.

Before any in the method for aspect, at least one parameter described is the merit before using for transmission before Rate level.Determine that quality may include that to provide and use many for sending before multiple on described radio uplink Power level before individual；To the power level application filter before the plurality of；And based on filtered multiple before Power level, determine described quality.

In one example, filter is following one: with or without the average filter of forgetting factor；Middle position Number filter；And maximum filter.In aforementioned aspect, the plurality of before power level corresponding to for the most true The happen suddenly power level used and/or the power used during predetermined time interval sent before fixed number Level.Power level before the plurality of can be limited to for successfully sending the power level used.Described at least One parameter can be the Modulation and Coding Scheme before using for transmission before.Can be based on previous modulating-coding side The bit rate of case determines described quality.In addition or alternatively, determine that quality may include that offer is on described radio Sending before multiple on line link use multiple before Modulation and Coding Scheme；Determine with the plurality of before modulation The associated plurality of bit rate of encoding scheme；To the plurality of bit rate applications filter；And based on filtered many Individual bit rate, determines described quality.

In aspect before any, at least one parameter described can be for before on radio uplink Send the Timing Advance used.Additionally, determine that quality may include that provide on described radio uplink multiple The multiple Timing Advances sending use before；Filter to the application of the plurality of Timing Advance；And based on filtered Multiple bit rates, determine described quality.

According to some aforesaid aspects, on radio uplink before transmission include: to one or more just The often transmission before burst.

In aspect before any, determine that quality includes: provide from described base station to the transmission of described wireless device Received signal level；The minima accessing the described received signal level needed for described base station at described wireless device is provided； And difference of based on described received signal level Yu the minima of described received signal level, determine described quality.

Determine that quality may include that the maximum providing described wireless device to be configured the received signal level measured；By The maximum of described received signal level to receive described in normalization signal electricity with the difference of the minima of described received signal level The difference of the flat minima with described received signal level；And based on described received signal level and described received signal level The normalized difference of minima, determines described quality.

A kind of for control between wireless device and base station one or more send exemplary method, one or More transmissions at least include initially sending, and described method includes: provide instruction from described wireless device to the biography of described base station Broadcast the current Timing Advance of delay；Select to access Timing Advance based on described current Timing Advance；And use institute State access Timing Advance to send described initial transmission.

Select to access Timing Advance and may include that this is fixed from timing advance value Resource selection access Timing Advance Time advance value set scope deduct the length of protection period of initial transmission from current Timing Advance to current Timing Advance Degree.In one example, use to access timing from Resource selection relative to the predetermined skew of current Timing Advance Lead；And described predetermined skew is fixing for wireless device.In another example, use relative to working as The skew of front Timing Advance accesses Timing Advance from Resource selection；And described skew is from belonging to wireless device The predetermined jump sequence of skew selects.Described predetermined jump sequence can be designed as: with for one Or one or more predetermined jump sequence of using of more other wireless devices has the dependency of minimizing.

In one example, access Timing Advance is randomly choosed from set.Additionally, according to some aforesaid examples, just Originate the difference of the protection period the sent number of symbols corresponding to every time slot and the initial payload number of symbols sent.The method is also May include that the finger received at wireless device the maximum Timing Advance that the wireless device being provided service by base station uses Show.The method can also include that the maximum Timing Advance based on receiving determines current Timing Advance.Can be based on working as Front Timing Advance and the maximum Timing Advance received select to access Timing Advance.

Method in terms of above particular example can also include that the maximum Timing Advance based on receiving regulates initially The length of the payload sent.According to example herein, described initial transmission can be that the GERAN used in GERAN connects Enter burst；Described initial transmission can be sent on the RACH be referred to as RACH；Described initial transmission can include Payload, synchronizing sequence bit and/or encrypting bit, described payload includes tail bit；Described initial transmission can be compared The time slot of described GERAN is short, and the protection period is the length difference with the length of described initial transmission of described time slot；Described wireless device It can be GERAN mobile station；And/or described base station can be GERAN base station.

As described in this article, wireless device can be configured to communicate with base station, and wherein, wireless device is configured to perform Above-mentioned any action and/or aspect.In one example, wireless device moves with the speed less than threshold speed, and/or Move less than in the region of region threshold.

As described in this article, software program may be adapted to perform on a processor, and ought perform software on the computing device During program, software program is for performing above-mentioned any action and/or aspect.Storage medium can include software program, software Program may be adapted to perform on a processor, and when performing software program on the computing device, and software program is used for performing above-mentioned Action and/or aspect.Computer program can include executable instruction, can perform to refer to when performing this on the computing device When making, this executable instruction is for performing above-mentioned action and/or aspect.

It should be noted that, the method and system including its preferred embodiment described in this document can be used alone or with this Additive method disclosed in document and system are used in combination.Furthermore, it is possible at random combine methods described in this document and be All aspects of system.Specifically, by any-mode, the feature of claim can be combined each other.

Accompanying drawing explanation

Below with reference to the accompanying drawings, by the way of exemplary, various aspects are explained, wherein

Fig. 1 illustrates to use example Timing Advance to be alignd with time slot by data burst in base station；

Fig. 2 illustrates the exemplary construction of access burst；

Fig. 3 shows the modification of the Timing Advance of the example transmission for access burst；

Fig. 4 is the block diagram of the example implementation of mobile station；And

Fig. 5 is the block diagram of the example network including mobile station and base station.

Detailed description of the invention

RACH (RACH) is to have collision detection but does not have the shared resource in the GERAN of conflict avoidance. Form according to time slotted ALOHA agreement dispatches the transmission on RACH to access burst.Divide with sending data at any time The ALOHA agreement purely of group (such as, access burst) is contrary, and time slotted ALOHA agreement uses can within it send data The time slot of packet.In GERAN, concrete carrier wave is subdivided into 8 physical carrier or time slot, wherein, the data sent from BTS Burst and the data burst received at BTS should align with these time slots.

In order to consider the propagation delay between MS and corresponding BS, and in order to ensure the burst sent to MS by BS with by The burst alignment that MS sends to BS, GERAN employs so-called Timing Advance (TA).Specifically, in Traffic Channel (TCH) Or on SACCH slow associated control channel (SACCH), BS expectation receives the burst alignd with BS to the time burst that MS sends from MS.Should Alignment should be independent of the relative position of MS with BS.To this end, MS uses its burst received from BS as time reference.Pass through The mode of example, the burst that MS can use BS to send on BCCH carrys out the slot synchronization with BS.In one embodiment, MS stays Stay on the network cell provided by BS.

In order to compensate on a radio link from BS to MS and return to the propagation delay of BS, with the time slot of the burst received Comparing, MS may need by the transmission of burst in advance.The value of the transmission shifted to an earlier date, i.e. Timing Advance (TA) depend on MS and BS Between geographic distance, and currently calculated by BS.BS (such as, sends out including RACH based on its transmission received from concrete MS Send, access burst sends) determine the TA of concrete MS.Generally used TA=0 to send RACH by MS to send.Thus, BS is permissible Determine the propagation delay that the RACH received sends.To TA determined by MS transmission, so that suitable TA is used for follow-up by MS Non-RACH sends, and the burst being thus sent to is alignd with the time slot of BS.

Fig. 1 illustrates the use to Timing Advance.BTS sends burst 211 to MS.MS receives the burst 212 postponed, Wherein, the delay of burst is corresponding to TA/2, i.e. the half of the value of Timing Advance.Receive in order to ensure BTS and to be sent by MS Burst 213 is used as the reception burst 214 alignd with the structure of time slot of the burst 211 initially sent, with the reception phase of burst 212 Ratio, MS must offset the transmission of burst 213.Offset interval corresponds to TA.It will be noted that the biography in up-link (UL) Broadcast delay and can be differently configured from the propagation delay on downlink (DL), because the signal on UL and on DL may not be followed identical Path.The 45MHz frequency shift (FS) that this is often as between UL and DL.Therefore, the delay of burst 212 can be differently configured from TA/2.

It will be noted that the transmission from the multiple equipment (can with at the different distance of BS) in community is the most overlapping, And preferably it is aligned in BS time reference and arrives.But, the receiver (RX) at BS and transmitter (TX) time reference one Cause dispensable, and at BS, skew (being transparent for MS) between RX and TX time frame, can be there is.

As noted above, when MS needs to access BS on RACH, MS sends the access that Timing Advance (TA) value is 0 and dashes forward Send out, and wait the response from BS.If MS is not received by response, this can be access burst owing to being sent with from separately The access burst conflict that one MS sends.After a random delay, MS sends another access burst and repeats this process, until its from Base station receives response, or until arrives the trial of the maximum number of permission.

Can by MS to retry process prescription as follows:

MS sends maximum (M+1) individual message on RACH.M is predetermined number of retries, and can be in MS Preset or can receive from network via BS.In other words, MS sends the first access burst and may individual the retrying of at most M connect Enter burst.

After sending the first access burst, MS begins listening for the response from BS.If MS has received from BS The response of effect, access procedure successfully terminates.

On the other hand, receiving response without from BS, MS sends another access burst.Access prominent sending another Before Faing, MS can wait certain number of time slot.The transmission opportunity (time slot) skipped between twice continuous access burst Number can be the random value taken out from the set of value, and for each MS, the set of this value can be specific.From value The value of set can have non-uniform probability.

After having sent (M+1) individual access burst, MS generally starts intervalometer.If intervalometer at MS from BS Receiving time-out before response, process is unsuccessfully to terminate.

Fig. 2 illustrates the exemplary construction of the access burst 200 used in GERAN.As noted above, access burst by with In Stochastic accessing, and compared with normal burst, including the longer protection period (persistent period of 68.25 bits or 252 μ s), with Catering to the burst from mobile station to send, this mobile station when accessing for the first time (or after switching from another BS) may not known The Timing Advance that road to use with BS.Access burst 200 includes the tail bit 201 of extension, synchronizing sequence 202, encrypting bit 203, tail bit 204 and the protection period 205 of extension.Provide the length of the different field of access burst 200 and interior in Table 1 Hold.

Table 1

Note 1: " the tail bit of extension " 201 is defined as the modulation bit of following state: (BN0, BN1, BN2 ..., BN7)=(0,0,1,1,1,0,1,0).Note 2: " synchronizing sequence bit " 202 is defined as following state Modulation bit: (BN8, BN9 ..., BN48)=(0,1,0,0,1,0,1,1,0,1,1,1,1,1,1,1,1,0,0,1,1,0,0, 1,1,0,1,0,1,0,1,0,0,0,1,1,1,1,0,0,0).Annotation 3: " tail bit " 204 is defined as following state Modulation bit: (BN85, BN86, BN87)=(0,0,0).At encrypting bit defined in technical specification 3GPP TS45.003 203, it is incorporated by reference into.

Due to for sending the fact that access burst of RACH is to send, the MS farther with distance BS with peak power Comparing, the MS close to base station has higher probability and meets with a response from base station.Even if in the case of no conflict occurred, with Compare with the transmission that lower signal level receives, the transmission received with higher signal level generally will have higher generally Rate is correctly decoded.From MS nearby and depositing in the case of a conflict between the access burst of distant place MS, base station is usual The RACH of MS nearby will be can decode that, and ignore the RACH from distant place MS.Due to MS it is normally in movement, for given MS, the benefit should closed on BS generally exists the most temporarily, and performance to channel access process does not has notable shadow on average Ring.But, the low probability that the fixing MS at the fixed position that distance service BS is the most remote can have repetition is right from BS reception The response that RACH sends.Thus, it is desirable to the development sending for RACH and confirming.

GERAN network can provide the function that up-link (UL) power controls.The purpose of control function of power is to reduce Interference level, maintains the service quality of connection simultaneously.This causes the spectrum efficiency in air interface and capacity to increase.In addition or standby Selection of land, it is possible to use the power in UL controls to reduce the power consumption of MS.

UL power control principle be by BS place received power level and/or reception link-quality be maintained at good value In the range of, i.e. exceed the scope of specific Minimum Power Level and/or quality threshold.If be detected that connect power level and/ Or quality exceedes these threshold values and reaches predetermined value, BS can order the MS being transmitted to reduce transmission power level.Change speech It, the power of BS controls the specific transmission power level included at order MS.Generally, the MS of GERAN network provides UL power control Function processed, can optionally provide the realization in BS.In GERAN, the order sent to MS from BS is relied on to realize uplink Road power controls.In other words, UL power controls is close-loop power control.Mainly connect (that is, voice traffic channel at voice (TCH) context) uses UL control function of power.

Alternative in or be additional to the transmit power controlled in up-link, Modulation and Coding Scheme can be revised at MS (MCS).The bit rate of data depends on used encoding scheme.GPRS uses 4 encoding schemes (CS-1 to 4), and EDGE uses 9 Modulation and Coding Scheme (MCS-1 to 9).Table 2 lists for sending packet switch number in full speed channel According to possible bit rate.

Modulation and Coding Scheme (MCS)	Bandwidth (kbit/s/ time slot)	Modulation
			CS-1	8.0	GMSK
CS-2	12.0	GMSK
			CS-3	14.4	GMSK
CS-4	20.22	GMSK
			MCS-1	8.80	GMSK
MCS-2	11.2	GMSK
			MCS-3	14.8	GMSK
MCS-4	17.6	GMSK
			MCS-5	22.4	8-PSK
MCS-6	29.6	8-PSK
			MCS-7	44.8	8-PSK
MCS-8	54.4	8-PSK
			MCS-9	59.2	8-PSK

Table 2

Encoding scheme differs in its robustness, wherein, it is provided that the encoding scheme that the robustness of higher bandwidth is poor is led to Often can use near Base Transceiver Station (BTS) place, and provide the more preferable encoding scheme of robustness of lower bandwidth MS from Still can use time at BTS larger distance.Thus, if BS determines that received power level and/or quality exceed respective threshold and reach Predetermined value, BS may indicate that MS is switched to allow the poor MCS of the robustness of more bit rate.

As has been noted, apart from its serving BS fixing equipment (such as, intelligence instrument) relatively far away from and distance The relative proximity of equipment of same base is compared, and generally has in this base station and is directed to relatively low the lacking of the received signal level of RACH Point.Generally, serving BS is closest to the base station of fixing equipment, but due to network management aspect, can not be this situation.

It will be noted that term " distance " and " closely " and " far " not necessarily characterize the MS geographical position relative to base station. On the contrary, this term description characteristic of radio link.With the MS at bigger geographic distance with sight line radio link Compare, it is considered to radio link, be positioned at geographic distance relative proximity of with base station but MS in the basement of building is permissible It is farther apart from this base station.For the fixing equipment of such as intelligence instrument, this is a problem especially, and this fixing equipment is usually located to be built Build in the basement of thing and therefore (from for the angle of radio link) at away from service BTS.

The fact that do not move due to concrete fixing equipment, relative to having other of " shorter radio link distance " Mobile station, this fixing equipment is continuously in unfavorable condition.This imbalance causes concrete fixing equipment successfully to carry out channel access Probability relatively low.

Solving a kind of possible mode of this imbalance problem can be to make power level (MS makes based on the distance from MS to BS Channel access is asked by power level), wherein, term " distance " is interpreted as the quality to the radio link from MS to BS Instruction.To this end, MS can estimate " nearness " or " away from degree " of MS, and be used as revised RACH delivery plan Parameter.Estimation to " distance " from MS to BS can be based on one or more in below scheme:

Estimation based on power level before

From MS to BS " distance " can be based on the power level being command by up-link, power that this is command by electricity Put down and be used for last or more up-link action.In other words, MS determines and has used with during the communication of BS before Power level on uplink.Usually as the result of above-mentioned UL power control scheme, this one or more power electricity Flat by BS order.In a preferred embodiment, it is used for estimating that this one or more power level of " distance " is limited For in the power level being successfully transmitted period use.Thus, the transmission power level that up-link sends before can provide pin Instruction for " distance " from MS to BS.General, it can be stated that the power level used in up-link is the highest, from MS to BS " distance " the biggest.

Estimation based on modulation/coding scheme (MCS) before

Alternatively or additionally, MS can the UL MCS being command by of based on the last UL MCS or last being command by Sequence estimates " distance " from MS to BS.For grouped data connects and/or voice (AMR) connects, this is special phase Closing, wherein, BS indicates MS to revise MCS according to power level/quality that the up-link from MS connects and (and therefore repaiies Change bit rate).Generally, when other conditions are identical, it may be said that indicate the fact that of BS order robustness poor MCS from " distance " of MS to BS is less.In the case of the voice using AMR connects, it is possible to use on UL, at one or more Multiple upper encoding/decoding modes (that is, AMR mode) used of last communication estimate " distance " from MS to BS.

Estimation based on the cell signal level received

Alternatively or additionally, can be based on from the received signal level (RXLEV) of BS and the minimum letter in this community The difference of number level (RXLEV_ACCESS_MIN) estimates " distance " from MS to BS.A letter after can being broadcasted by service BTS Breath (such as, via BCCH).Thus, it is possible to the nearness factor " NNF " of the instruction " distance " from MS to BS is estimated as:

$\mathrm{NNF}=1-\frac{\mathrm{RXLEV}-\mathrm{RXLEV}\_\mathrm{ACCESS}\_\mathrm{MIN}}{\mathrm{RXLEV}\_\mathrm{MAX}-\mathrm{RXLEV}\_\mathrm{ACCESS}\_\mathrm{MIN}},$

Wherein

Nearness factor NNF provides the estimation to the relative distance from MS to BS；

RXLEV is the received power level of the BS signal at MS, as single sampling or average to multiple measurements；

RXLEV_ACCESS_MIN is to access the minimum received signal power level needed for network at MS；And

RXLEV_MAX is the maximum signal (typically-48dBm) that any MS of requirement measures.

" distance " from MS to BS is estimated measurement based on downlink side path quality upwards by this.Due to The duplex distance of the 45MHz used in GERAN, i.e. due between the frequency band in up-link and the frequency band on downlink Difference on the frequency, the estimation of " distance " of uplink channel is probably insecure by parameter based on downlink channel conditions. This is owing to the fact that interference and multipath conditions on uplink and can differ on the uplink causing, and this is not Identical is owing to the different frequency bands used for this both direction causes.

Estimation based on TA value before

As outlined above, Timing Advance (TA) parameter is used to compensate the biography on the radio link between BS and MS Broadcast delay.Specifically, MS (receives sending the time interval the most corresponding with the value of TA to the burst of BS relative to from BS The timing of burst), to guarantee that the burst received at BS is alignd with the time slot of the burst sent from BS.Thus, TA value is Indicator to the geographic distance between BS and MS, its equally to " distance " between MS to BS (from the angle of radio link For degree) have an impact.BS can use " TA skew ", i.e. it can will snap to time base to the reception of the transmission from MS Standard, this time reference is from the time reference skew sent for it.In this case, to MS during uplink communication session The TA signaled can be differently configured from the TA that will signal when not using TA to offset.In order to assist MS based on indication The TA value of group determines " distance " from MS to BS, and BS may indicate that whether (such as, by broadcast or point-to-point signaling) uses this Kind skew (and, if used, the value of this skew).

Can be used alone or by any combination use the above-mentioned estimation for " distance " from MS to BS and Other are estimated, to provide the comprehensive estimation to " distance ".It will be noted that estimate " distance " from MS to BS, i.e. up-link On distance.As described above, this UL " distance " can be differently configured from downlink (DL) " distance " (from the angle of radio link For).

Based on estimated " distance ", can the transmit power that sends of the RACH from MS to BS identified below.If estimated BS Yu MS " distance " farther out, compared with Reference power levels, can increase the power level of the access burst sent on RACH. In other words, if estimated " distance " is higher than distance threshold, the power level for sending access burst can be increased.Alternative If ground or additionally, estimate that BS Yu MS " distance " is relatively near, the transmit power for RACH transmission can be reduced.In other words, if Estimated " distance " from MS to BS, less than (being likely to different) distance threshold, can reduce the power sent for RACH Level.Thus, it is possible to be provided for, according to " distance " from MS to BS, the power level that RACH sends.Therefore, for The different MS at different " distance " place of BS, can coordinate the probability that successful RACH sends.

Can be revised and/or improve the above-mentioned power level sent for RACH depending on " distance " by various modes Management.Can be used alone or this amendment and/or improvement can be used with being combined with each other.By way of example, MS can To apply predetermined skew to the power level determined based on above-mentioned estimation.The value of this skew can be scheduled, pass through base Stand broadcast (such as, via BCCH) or based on point-to-point come to MS transmit.Predetermined skew can be used to guarantee The power level sent for RACH determined will not be the lowest and/or will not be the highest, i.e. to guarantee minimum channel access performance And/or to limit MS power consumption or to avoid concrete MS to shield other MS.Thus, base station can order MS to be higher or lower than The power level of estimated power level sends, and thus access procedure is carried out specific control.In an illustrative manner, base Stand and can carry out (provisionally) deexcitation power level estimation (such as, power level fall by arranging high predetermined skew Low).

In one embodiment, MS can apply: the output power levels used before filtration, to determine from MS to BS The estimation of " distance ".The example of this filter method is: moving average (running average) (uses or do not uses something lost Forget the factor)；For last N number of data block or during the last T second use centre or maximal power level；Or sent Data block and the combination of time pass by.Thus, it is possible to based on multiple filtered before power level value determine right The estimation of " distance ".

In one embodiment, MS is configured to after defined number N unsuccessful attempt increase for RACH The power level sent.Power level can be increased predetermined value.Power level increase can be performed for retrying every time.Logical Cross the mode of example, if access attempts is not owing to responding to and failure, identical power can be used for the first repetition Access attempts, and in the case of allowing more repetition in the cell, for remaining access attempts, output can be carried Value that is high predetermined or that signal.Thus, retry every time can increase successful RACH send probability.

For coordinating another program of the probability of the successful RACH transmission for the different MS being provided service by BS can be Use that has revised to retry algorithm.Success rate can be sent by the RACH being used for balancing between the MS of " nearby " and " at a distance " Mode is revised and is retried algorithm.Such as, " nearby " MS can be allowed to less retrying and/or after unsuccessful attempt, The longer time may be had to wait for before it sends next access burst.Can be used alone, or can be with this document Described in additive method combine use revised for RACH send retry algorithm.Furthermore, it is possible to according to herein Any method of estimation described in Dang determines " distance " of MS to BS.

In retrying algorithm, exist and may be adapted to the success that balance sends for RACH between the MS of " nearby " and " at a distance " Two parameters of probability:

The number retried that M-allows, and/or

Be defined on that RACH sends two skip the random value of how many potential sending time slots between continually attempting to.

The two parameter can be revised as follows: for " nearby " MS, the number of retries M of permission can be reduced.To permission The reduction of number of retries M can relate to " distance " from MS to BS.Alternatively, or additionally, two continuous RACH can be arranged send Between idle time (dead the time) (DT depending on distance_dist).Process is retried (wherein, during minimum idle based on tradition Between can be the value randomly generated) the minimum idle time, can increase according to " distance " from MS to BS and/or reduce Little idle time.In other words, according to " distance " from MS to BS, can increase and/or reduce being directed to twice continuous RACH and send out The difference randomly generating value of the idle time between sending.It is said that in general, therefore the parameter being used for defining distribution can change, its In, " idle time " or back-off value at random can be drawn according to described distribution.

Alternative outside process as described above or the method that is described above, access burst can be directed to by setting The pseudo-initial timing lead of transmission increase the success rate that RACH sends.Substitute and always TA=0 is used for access burst, MS Variable TA can be used.MS can be known its true TA by transmission before, and therefore, MS is it is known that it can be by access burst Transmission skew how many, and be not resulted in the interference to adjacent time-slots.If MS has determined that it does not sends from last Position remove, and if MS is it has been determined that it is accessing identical base station, MS is it is known that its true TA.Specifically, Fixing MS can be known its real TA by transmission before.

When knowing true TA, can be able to be randomly selected for sending access burst in the interval of each MS TA.It is alternatively possible to select TA so that the reception to access burst (such as, can be handed in the first half of time slot and later half Alternately) occur.The skew of (little) additional random can be used or do not use to send access burst.Alternatively, the selection to TA Defined pattern can be followed, this pattern can be referred to as " TA jump sequence ".

As noted above, it is assumed that MS knows its true TA value, such as, by transmission before and know its position betwixt Do not significantly change and know.This is usually fixed the situation of MS.If MS knows its real timing advance value TA_true, MS This TA value can be used to send access burst (substitute TA=0), and be not resulted in the interference to adjacent relatively early time slot.Pass through class As mode, MS can will send delay 68.25 (TA_trueIndividual symbol period), and it is not resulted in doing adjacent later time slot Disturb.This be due to the length of GERAN time slot be 156.25 symbols the fact that, and there is no the access burst of extended protection phase Length is 88 symbols.In one embodiment, TA_trueMaximum be 63.

This is illustrated by Fig. 3, wherein, it is shown that use timing advance TA_trueThe access burst sent 301.Access burst 301 includes effective payload portion 302 and extended protection portion 303.It can be seen that when with timing advance TA_true When sending access burst 301, the payload portion 302 of access burst 301 arrives BTS in time slot N (reference 312).With Time slot N-1 (reference 311) before and time slot N+1 (reference 313) afterwards does not interferes with.By similar side Formula, it can be seen that if with timing advance TA_true-68 (or even TA_true-68.25) send and include effective payload portion 305 and the access burst 304 in extended protection portion 306, payload portion 305 arrives BTS in time slot N (reference 312), and And do not interfere with time slot N-1 (reference 311) before and time slot N+1 (reference 313) afterwards.

In order to send access burst 301, MS can always use and come from set [TA_true, TA_true-68.25] identical TA value.Alternatively, MS can be from set [TA_true, TA_true-68.25] random value with non-uniform probability is selected.Alternatively, MS Can select to follow predetermined sequence value (by with by the way of the jump sequence of frequency hopping is similar).There is provided for by BTS The different MS of service, predetermined sequence can be different.The different predetermined sequences that different MS use can be the most orthogonal.Change speech It, can be designed as different predetermined sequences reducing or minimize the conflict between the access burst that different MS sends.

It will be noted that after receiving access burst from MS, BS notifies TA value to MS.Owing to BS usually assumes that access is prominent Sending out and used TA=0 to send by MS, MS can need with MS for sending the actual TA value of access burst to correct it from BS The TA value received.It is then possible to the TA value corrected is used for the subsequent communications from MS to BS.MS can not lead to network (that is, the TA value that BS may have already been signaled that makes MS by TA to proceed subsequent communications in the case of knowing its actual TA value =0 is used for its access burst).In certain embodiments, the TA value of MS notice its reality of network, or indicate it by non-zero TA value For its access burst.

The advantage using the method for pseudo-TA value is to which increase the access burst 301 of " conflict " (that is, from different MS , the burst 301 arriving BS in identical time slot 312) the most nonoverlapping probability in payload portion 302.By making By the program, can at least realize reducing the probability of payload portion 302 overlap.It is thus possible to increase correctly will connect at BS Receive the probability (rather than access burst of neither one conflict) of the access burst 301 of at least one conflict.On the whole, permissible Say by amendment for sending the Timing Advance of access burst, select the admissible moment for sending access burst, with Reduce or minimize the probability overlapping with the access burst of other MS.

As another option that can use when selecting the Timing Advance for sending access burst, BS can send Instruction to the typical TA of its maximum, such as, the instruction to the maximum TA to any MS appointment currently being provided service by BS.Can To broadcast this information via BCCH.Thus, concrete MS it is known that in current area use largest ta value.Can use This knowledge regulates concrete MS for sending the TA of access burst.Specifically, the TA used by concrete MS can be regulated, to reduce Or minimize the probability overlapping with tradition RACH transmission (that is, with the transmission at TA=0).Alternatively, or additionally, tool can be revised The length of the access burst that body MS sends to BS, to reduce or to minimize the overlap of the multiple access bursts sent by multiple MS generally Rate.In an illustrative manner, if the maximum typical case TA used in community is relatively low, the most all of legacy equipment (that is, uses TA=0 The equipment being transmitted on RACH) its access burst will be sent (because correct TA is relatively low, and therefore very close to correct TA Near TA=0).

In addition it is possible to use be used as TA with the maximum information relevant for typical case TA used in community_trueThe finger of value Show, i.e. as the instruction to the information relevant with the true timing advance value of concrete MS.In an illustrative manner, if community The TA of middle appointment is the most relatively low, i.e. if the maximum typical case TA that BS transmits is relatively low, the most concrete MS has following instruction: even if To for send access burst TA add significantly offset time, the access burst sent strides across when being received by BTS Boundary of time slot is also unlikely that.

Selection to Timing Advance can relative priority based on access attempts.It is, for example possible to use timing advance Amount sends the transmission of low priority or resistance to delay, and (or the access that is associated with the transmission of low priority or resistance to delayed data dashes forward Send out send) so that BS time slot internal ratio other send (including the transmission from legacy equipment) late receive this transmission.This can To allow BS non-low priority access burst or transmission to be successfully decoded, even if having received low priority during identical time slot Access burst/transmission.MS can be configured to send all of access burst as low priority burst (such as, be exclusively used in tool The equipment of body function, such as sensor device).

With reference now to Fig. 4, Fig. 4, show and can such as realize the mobile station of any method described in the disclosure, Yong Hushe Standby or the block diagram of wireless device 100.It is appreciated that merely for exemplary purpose to illustrate wireless device 100.By processing equipment (microprocessor 128) is shown schematically as being coupling between keyboard 114 and display 126.Microprocessor 128 is in response to user Start button on keyboard 114, control the operation of display 126, and the integrated operation of wireless device 100.

Wireless device 100 has shell, and this shell can take other size and shape (including clamshell housing structures). Keyboard 114 can include mode selecting key or between inputting at text input and phone other hardware of switching over or Software.

Except microprocessor 128, also schematically show the miscellaneous part of wireless device 100.These parts include: logical Letter subsystem 170；Short-range communication subsystem 102；Keyboard 114 and display 126, and other input-output apparatus (includes The set 104 of LED, the auxiliary set of I/O equipment 106, serial port 108, speaker 111 and mike 112)；And storage Equipment (includes flash memory 116 and random access memory (RAM) 118)；And various other equipment subsystem 120.Wireless set Standby 100 can have battery 121, power for the active component for wireless device 100.Wireless device 100 is in some embodiments In be bi-directional RF (RF) communication equipment with voice communications versus data communications ability.Additionally, wireless device 100 is in some embodiments In there is the ability communicated with other computer systems via the Internet.

In certain embodiments, microprocessor 128 operating system software performed is stored in such as flash memory 116 etc forever For a long time in property memorizer but it also may be stored in the other kinds of of read only memory (ROM) or similar memory element etc such as and deposit In storage equipment.Furthermore, it is possible to systems soft ware, special equipment application or its part are loaded into such as RAM118 etc is volatile temporarily In property memorizer.The signal of communication that mobile station 100 receives can also be stored in RAM118.

In addition to its operating system functions, microprocessor 128 can also perform the software application in mobile station 100.Permissible The predetermined software set of applications controlling basic device operations is installed during manufacture in mobile station 100, such as voice communications module 130A and data communication module 130B.Further, it is also possible to install personal information manager during manufacture in mobile station 100 (PIM) application module 130C.In certain embodiments, PIM application can organization and management data item, such as Email, calendar Event, voice mail, appointment and task items.In certain embodiments, PIM application can also via wireless network 110 send and Receiving data item.In certain embodiments, the data item of PIM application management deposit in host computer system via wireless network 110 Storage or be associated with host computer system, the corresponding data item seamless integration of equipment user, synchronize and update.Furthermore, it is possible to Additional software module (being illustrated as other software modules 130N) is installed during manufacture.

Communication subsystem 170 can be passed through, and may perform to include data and language by short-range communication subsystem 102 Sound communicates at interior communication function.Communication subsystem 170 includes receiver 150, transmitter 152 and one or more antenna (being shown as reception antenna 154 and transmission antenna 156).Additionally, communication subsystem 170 also includes: processing module, at digital signal Reason device (DSP) 158, and local oscillator (LO) 160.The communication subsystem 170 with transmitter 152 and receiver 150 is wrapped Include the function for realizing one or more embodiment described above in detail.The specific design of communication subsystem 170 and reality Now depend on the communication network that mobile station 100 is to be operated in.Such as, the communication subsystem 170 of mobile station 100 can be set It is calculated as and Mobitex^TM、DataTAC^TM, GERAN or general packet radio service (GPRS) mobile data communication network together Operate, be additionally designed to multiple voice communication network that (such as, Advanced Mobile Phone Service (AMPS), time division multiple acess connect Enter (TDMA), CDMA access (CDMA), personal communication service (PCS), global system for mobile communications (GSM)) in any one Operate together.The example of CDMA includes 1X and 1x EV-DO.Thus, wireless device 100 can support that multiple radio connects Enter technology, such as, GSM, GPRS, EDGE, UTRAN-TDD, UTRAN-FDD, E-UTRAN, CDMA2000.Communication subsystem 170 It is also designed as together with 802.11Wi-Fi network and/or 802.16WiMAX network operating.Mobile station 100 can also be with Separate utilizes together with integrated other kinds of data and voice network.

When being complete network registry or activation process, mobile station 100 can send on communication network 110 and receive Signal of communication.The signal that reception antenna 154 receives from communication network 110 is provided by pathfinding to receiver 150, receiver 750 To signal amplification, down coversion, filtering, Channel assignment etc., and may also provide analog to digital conversion.The modulus of the signal received is turned Change so that DSP158 can perform more complicated communication function, such as demodulation and decoding.In a similar fashion, DSP158 is to sending out The signal delivering to network 110 carries out processing (such as modulate and encode), be provided to transmitter 152 with carry out digital-to-analogue conversion, Up-conversion, filter, amplify and via launch antenna 156 be sent to communication network 110 (or multiple network).

In addition to processing communication signals, DSP158 provides receiver 150 and the control of transmitter 152.For example, it is possible to it is logical Cross the automatic gaining controling algorithm performed in DSP152 to control adaptively to be applied in receiver 150 and transmitter 158 The gain of signal of communication.

System and equipment that short-range communication subsystem 102 allows to close on other at wireless device 100 (there is no need Similar equipment) between communicate.Such as, short-range communication subsystem can include infrared equipment and interlock circuit and assembly Or bluetooth？Communication module, to provide the system with similar enable and the communication of equipment.

In some implementations, wireless device 100 may be operable in multiple patterns so that it is (circuit is handed over can to participate in CS Change) and PS (packet switch) communication, and change to another communication pattern from a communication pattern while seriality can not be lost. Other realizations are possible.

In the particular embodiment, in the said method sending channel access request to respective base station 110 Or multiple by be suitably configured as together realizing the communication subsystem 170 of a kind of method described herein, microprocessor 128, RAM118 and data communication module 130B realizes.

Fig. 5 is the block diagram that can realize the one or more system in above-described embodiment wherein.Exist with network (by The network equipment or base station 510 represent) mobile station 500 of radio communication.As shown in Figure 4 in the context, mobile station 500 have to A few antenna 502, transmitter 502 and receiver 504 (can together be embodied as transceiver) and controller 508.Network sets Standby or base station 510 have at least one antenna 514, transmitter 516 and receiver 518 (can together be embodied as transceiver) and Controller 520.Control can be realized by the combination (software run the most on a processor) of hardware or software and hardware Device 508,520.

In current document, it has been described that for the method and system of the probability that successfully modified RACH sends.For by BS provides some in the MS of service, and probability that success channel access can be increased or decreased.Specifically, it is possible to use the party Method and system provide the fair distribution to the probability that success channel accesses between the MS being provided service by concrete BS.Work as process During fixing MS (may combine with on-fixed MS), this is particular importance.Described method and system relies on amendment to be used for The UL power level that RACH sends, and/or amendment is for the algorithm that retries of RACH transmission, and/or amendment sends for RACH and makes TA.The estimation to " distance " (for from the angle of radio link) from MS to BS can be limited by repair to perform this Change.

Methods described in this document and system can realize with software, firmware and/or hardware.Specific components can be with example As being embodied as operating in the software on digital signal processor or microprocessor.Other assemblies can such as be embodied as hardware or special Use integrated circuit.The signal met with in described method and system can be stored in such as random access memory or optical storage On the medium of medium.They can transmit via network (such as radio net, satellite network or wireless network).Use this The exemplary apparatus of the method and system described in document is mobile station (such as mobile phone or smart phone).At network side, should Method and system may be used in base station equipment.

Claims (16)

1. one kind use in a wireless device for control between described wireless device (100) and base station (110) one or The method of more transmissions, one or more transmission at least include from described wireless device (100) to described base station (110) the initial transmission on radio uplink, described method includes:

Determine the quality of radio uplink between described wireless device (100) and described base station (110), described quality base In for from described wireless device (100) to the transmission institute before on the described radio uplink of described base station (110) At least one parameter used；

The quality of described radio uplink determined by based on, is provided for controlling wireless device (100) and base station (110) Between the control parameter of transmission；

Send described initial transmission,

Wherein it is determined that described quality includes:

There is provided for sending before multiple on described radio uplink use multiple before Modulation and Coding Scheme；

Determine with the plurality of before the associated plurality of bit rate of Modulation and Coding Scheme；

To the plurality of bit rate applications filter；And

Based on filtered multiple bit rates, determine described quality.

2. one kind use in a wireless device for control between described wireless device (100) and base station (110) one or The method of more transmissions, one or more transmission at least include from described wireless device (100) to described base station (110) the initial transmission on radio uplink, described method includes:

Determine the quality of radio uplink between described wireless device (100) and described base station (110), described quality base In for from described wireless device (100) to the transmission institute before on the described radio uplink of described base station (110) At least one parameter used；

The quality of described radio uplink determined by based on, is provided for controlling wireless device (100) and base station (110) Between the control parameter of transmission；

Send described initial transmission,

Wherein it is determined that described quality includes:

There is provided for sending, before multiple on described radio uplink, the multiple Timing Advances used；

To the plurality of Timing Advance application filter；And

Based on filtered multiple Timing Advances, determine described quality.

3. one kind use in a wireless device for control between described wireless device (100) and base station (110) one or The method of more transmissions, one or more transmission at least include from described wireless device (100) to described base station (110) the initial transmission on radio uplink, described method includes:

Determine the quality of radio uplink between described wireless device (100) and described base station (110), described quality base In for from described wireless device (100) to the transmission institute before on the described radio uplink of described base station (110) At least one parameter used；

The quality of described radio uplink determined by based on, is provided for controlling wireless device (100) and base station (110) Between the control parameter of transmission；

Send described initial transmission,

Wherein it is determined that described quality includes:

There is provided from described base station (110) to the received signal level of the transmission of described wireless device (100)；

The minima of the offer described received signal level needed for described wireless device (100) place accesses described base station (110)； And

Difference based on described received signal level Yu the minima of described received signal level, determines described quality,

Wherein, difference based on described received signal level Yu the minima of described received signal level, determine that described quality includes:

Described wireless device (100) is provided to be configured the maximum of the received signal level measured；

According to the difference of minima of maximum and the described received signal level of described received signal level, to described reception signal Level is normalized with the difference of the minima of described received signal level；And

Normalized difference based on described received signal level Yu the minima of described received signal level, determines described quality.

Method the most according to claim 3, wherein, described control parameter is power level；And described method also includes:

After being not received by the confirmation to one of one or more transmission, increase described power level for rear Supervention send.

Method the most according to claim 3, wherein, described control parameter is the number retried allowed.

Method the most according to claim 3, wherein, arranges described control parameter and includes:

Back-off intervals is set；And

Back off time is elected as the random number in described back-off intervals.

Method the most according to claim 3, wherein, for determine described radio uplink quality described at least One parameter be with the next item down or more: power level, Modulation and Coding Scheme or Timing Advance.

Method the most according to claim 3, wherein, described before transmission include: to one or more normal burst Transmission before.

9. one kind use in a wireless device for control between described wireless device (100) and base station (110) one or The device of more transmissions, one or more transmission at least include from described wireless device (100) to described base station (110) the initial transmission on radio uplink, described device includes:

For determining the unit of the quality of the radio uplink between described wireless device (100) and described base station (110), Described quality based on for from described wireless device (100) to the described radio uplink of described base station (110) on it At least one parameter that front transmission is used；

For based on determined by the quality of described radio uplink, be provided for controlling wireless device (100) and base station (110) unit of the control parameter of the transmission between；

For sending the unit of described initial transmission,

Wherein, for determining that the unit of described quality includes:

Sending before providing for multiple on described radio uplink use multiple before modulating-coding The unit of scheme；

For determine with the plurality of before the unit of the associated plurality of bit rate of Modulation and Coding Scheme；

For the unit to the plurality of bit rate applications filter；And

For based on filtered multiple bit rates, determining the unit of described quality.

10. one kind use in a wireless device for control between described wireless device (100) and base station (110) one or The device of more transmissions, one or more transmission at least include from described wireless device (100) to described base station (110) the initial transmission on radio uplink, described device includes:

For determining the unit of the quality of the radio uplink between described wireless device (100) and described base station (110), Described quality based on for from described wireless device (100) to the described radio uplink of described base station (110) on it At least one parameter that front transmission is used；

For based on determined by the quality of described radio uplink, be provided for controlling wireless device (100) and base station (110) unit of the control parameter of the transmission between；

For sending the unit of described initial transmission,

Wherein, for determining that the unit of described quality includes:

The list sending the multiple Timing Advances used before providing for multiple on described radio uplink Unit；

For the unit to the plurality of Timing Advance application filter；And

For based on filtered multiple Timing Advances, determining the unit of described quality.

11. 1 kinds use in a wireless device for control between described wireless device (100) and base station (110) one or The device of more transmissions, one or more transmission at least include from described wireless device (100) to described base station (110) the initial transmission on radio uplink, described device includes:

For determining the unit of the quality of the radio uplink between described wireless device (100) and described base station (110), Described quality based on for from described wireless device (100) to the described radio uplink of described base station (110) on it At least one parameter that front transmission is used；

For based on determined by the quality of described radio uplink, be provided for controlling wireless device (100) and base station (110) unit of the control parameter of the transmission between；

For sending the unit of described initial transmission,

Wherein, for determining that the unit of described quality includes:

For providing the unit of received signal level from described base station (110) to the transmission of described wireless device (100)；

For providing described received signal level needed for described wireless device (100) place accesses described base station (110) The unit of little value；And

For difference based on described received signal level Yu the minima of described received signal level, determine the list of described quality Unit,

Wherein, for difference based on described received signal level Yu the minima of described received signal level, described quality is determined Unit include:

For providing described wireless device (100) to be configured the assembly of maximum of the received signal level measured；

For the difference of the minima of maximum and described received signal level according to described received signal level, to described reception The assembly that the difference of the minima of signal level and described received signal level is normalized；And

For normalized difference based on described received signal level Yu the minima of described received signal level, determine described matter The assembly of amount.

12. devices according to claim 11, wherein, described control parameter is power level；And described device also wraps Include:

For after being not received by the confirmation to one of one or more transmission, increase described power level with Unit in follow-up transmission.

13. devices according to claim 11, wherein, described control parameter is the number retried allowed.

14. devices according to claim 11, wherein, include for arranging the unit of described control parameter:

For arranging the assembly of back-off intervals；And

For the assembly that back off time is elected as the random number in described back-off intervals.

15. devices according to claim 11, wherein, for determine described radio uplink quality described extremely A few parameter be with the next item down or more: power level, Modulation and Coding Scheme or Timing Advance.

16. devices according to claim 11, wherein, described before transmission include: one or more is normally dashed forward Transmission before Faing.