CN101882946A - Frequency-hopping method in GERAN (GSM EDGE Radio Access Network)/VAMOS (Voice services over Adaptive Multi-user channelson One Slot) system - Google Patents
Frequency-hopping method in GERAN (GSM EDGE Radio Access Network)/VAMOS (Voice services over Adaptive Multi-user channelson One Slot) system Download PDFInfo
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
- H04B2001/7154—Interference-related aspects with means for preventing interference
Abstract
The invention relates to a frequency-hopping method in a GERAN (GSM EDGE Radio Access Network)/VAMOS (Voice services over Adaptive Multi-user channelson One Slot) system. The method comprises the following steps of: calculating the frequency used by each frame according to a frequency-hopping scheme in a GSM (Global System for Mobile Communications) standard aiming at a user on a VAMOS subchannel 1; changing self MAIO (Mobile Allocation Index Offset) values in per frame or with an interval of a plurality of frames aiming at a user on a VAMOS subchannel 2; and then calculating the frequency used by a current frame by combining a frequency-hopping serial number (HSN) and a current frame number. By adopting the method, the frequency-hopping scheme aiming at the user on the subchannel 2 is changed only, the frequency-hopping scheme aiming at the user on the subchannel 1 is not changed, and extra computational complexity is not brought while realizing frequency diversity and user diversity.
Description
Technical field
The present invention relates to wireless communication system, more specifically, relate to the frequency-hopping method in a kind of GERAN/VAMOS system, be used for utilizing improved hopping scheme to improve the user diversity gain in the hope of improving transmission reliability at wireless communication system.
Background technology
In recent years, owing to the sharp increase to the mobile voice service demand, the GSM network has welcome huge development.But limited frequency resource more and more is difficult to satisfy people's conversation needs, especially in the thickly populated city.Be accompanied by the increase of existing GSM network equipment degree of aging, more press for existing GSM network is carried out dilatation.On the other hand, because the rate of voice service reduce year by year, concerning operator, need more effectively reuse existing hardware resource and frequency resource.So, how on the basis that does not increase the existing system frequency resource, to improve power system capacity and become a very important research direction.
The multi-user reuses a time slot (Multiple User Reuse One Slot, MUROS) technology is mainly used in 3GPP GSM EDGE Radio Access Network (GSM/EDGE RadioAccess Network, GERAN) in, GERAN#36 the meeting of Study Item stage from November, 2007 enters on, be intended to improve the user capacity of gsm system, help operator to alleviate network pressure.The GERAN#40 meeting that the Work Item stage starts from November, 2008 is formally named into VAMOS (Voice services over Adaptive Multi-user channelson One Slot).
The VAMOS system need further improve the speech capacity on the basis of reusing conventional network equipment and Radio Resource.In the feasibility study stage, candidate's VAMOS solution mainly is multiplexing two or more users of same time slot (Slot) under the prerequisite that does not reduce speech quality.At present main what consider is that speech capacity with system improves 2 times, and promptly every time slot is reused two users.On the one hand, what be subjected to that this influences is full rate and half rate speech channel, TCH/FS, TCH/HS, TCH/EFS, TCH/AFS, TCH/AHS and TCH/WFS, and relevant associated control channel are as slow associated control channel (SACCH) and Fast Associated Control Channel (FACCH).On the other hand, after the use VAMOS technology,, certainly will cause co-channel interference and the adjacent increase of disturbing frequently, cause the reduction of carrier/interface ratio (C/I) and channeling along with the increase of number of users in the sub-district.How, need further research reducing channeling and improving time slot and obtain between reusing compromisely.
Existing VAMOS candidate solutions mainly contains following three kinds:
1) is total to Speech frame (Co-TCH) scheme
Down link: linear two-way Guassian Minimum Shift Keying GMSK (GMSK) baseband modulation signal (two-way phase phasic difference Pi/2) that merges, carry out launching after rf modulations and the power amplification again.
Up link: each travelling carriage adopts the GMSK modulation respectively, and uses different training sequence (TSC), isolates the multiplexing subscriber signal of two-way in methods such as base station end use joint-detection.
2) orthogonal sub-channels (OSC) scheme
Down link: adopt quarternary phase-shift keying (QPSK) (QPSK) to come transmitting two paths user's signal, at user's receiving terminal, every road user's signal all can be modulated by GMSK and receive.
Up link: each travelling carriage adopts the GMSK modulation respectively, and uses different training sequences, isolates the multiplexing signal of two-way in methods such as base station end use interference eliminated.
3) self-adaptive symbol constellation mapping (ASC) scheme
Down link: adopt the alpha-QPSK scheme, can regulate the transmitting power that constellation mapping is controlled I road and Q road by self adaptation.
Up link: each travelling carriage adopts the GMSK modulation respectively, and uses different training sequences, uses multi-user-multiple-input and multiple-output (MU-MIMO) receiver to demodulate the multiplexing signal of two-way at the base station end.
At present, in the VAMOS Work Item stage, what mainly consider is above-mentioned 3 kinds of schemes, makes two users can share identical running time-frequency resource, makes power system capacity improve 2 times target to reach.But any scheme of the concrete employing of 3GPP GERAN, at present still under discussion.
No matter which kind of scheme can be regarded two subchannels, subchannel 1 and the subchannel 2 of sharing identical running time-frequency resource as.Usually, the mobile phone that subchannel 1 compatibility is more early stage can only use the VAMOS mobile phone on the subchannel 2.
Fig. 1 is the frame assumption diagram of gsm system.Gsm system adopts time division multiple access (TDMA), and each tdma frame is divided into 8 time slots, and label is from 0,1 ..., 7.Frame or time slot all are non-overlapping copies.Time slot (Slot) is the basic radio resource units of gsm system.According to certain time slot allocation principle, make each travelling carriage can only be in every frame at the time slot of appointment to base station transmit signals, to satisfy regularly and under the synchronous condition, the base station can receive the signal of each travelling carriage respectively and mixed mutually disturbing in each time slot.Simultaneously, the base station is sent to the signal of a plurality of travelling carriages and all arranges in order, transmits in predetermined time slot.Each travelling carriage just can come out the signal distinguishing of issuing it in closing the signal on road as long as receive in the time slot of appointment.
Fig. 2 is the VAMOS frame assumption diagram.Under circuit switched mode, VAMOS allows multiplexing two users on identical running time-frequency resource, and these two users constitute a VAMOS pair.Share identical time slot label, absolute wireless frequency channel label (ARFCN) and tdma frame number at up link and down link.
Fig. 3 organizes down link modulation schematic diagram for VAMOS user, is mapped on a self adaptation QPSK (AQPSK) modulation symbol from the bit of each user TCH channel among the VAMOS pair and corresponding associated control channel.At receiving terminal, the bit of one's own TCH channel of user's demodulation and corresponding associated control channel is done Radio Link simultaneously and is measured.
In up link, in the same sub-district, adopt two subscriber signals of GMSK modulation on identical running time-frequency resource, to send, promptly these two users have identical time slot label, ARFCN and tdma frame number.Differentiation between the user depends on the user and sends training sequence (TSC) in the data, and in the same sub-district, the user on the subchannel 1 uses the training sequence among the TSC set 1, and the user on the subchannel 2 uses the training sequence among the TSC set 2.At the base station receiving terminal, adopt Multiuser Detection or interference cancellation techniques demodulation, decipher two users' that receive signal, carry out corresponding Radio Link control at these two users simultaneously.
In gsm system, adopted discontinuous transmission (DTX) technology.Detect the gap of speech when voice codec after, the phase does not send in the gap.
The effect of DTX is:
1, use DTX can reduce the level of interference in the system, and improves system effectiveness.
2, owing to used the DTX transmitter, emission has descended total time, and power loss has prolonged the battery life of MS when reducing.
In order to realize DTX, use voice activation to detect (VAD), can provide indication in case pausing appears in speech.
At down link, when the TCH channel adopted the DTX technology, concerning a VAMOS pair, if these two users have data to need to send, when promptly all being in non-DTX state, the AQPSK modulation was adopted in the base station, as shown in Figure 3; If one of them user's TCH channel is in the DTX state, and another user is in non-DTX state, so this moment, the base station will send the user of GMSK modulation signal to non-DTX state; When these two users' TCH channel all was in the DTX state, the base station then only sent DTX information.Therefore, if fitting over together, energy and DTX user will improve user's channel quality greatly.
Existing three kinds of VAMOS candidate schemes (Co-TCH, OSC and alpha-QPSK) are though guaranteed orthogonality between two multiplexing users at transmitting terminal, but because the multipath transmisstion characteristic of wireless channel causes intersymbol interference, and the nonlinear characteristic of transmitting filter and receiving filter, all can cause leakage signal at two sub-interchannels of receiving terminal.At down link, this means that these multiplexing two users interfere with each other; And in up link, the orthogonal property that the random phase official post between the user gets receiving terminal can not guarantee, even channel is during the decline of time of origin dispersivity.Exactly because can't guarantee the orthogonality of two sub-interchannels at receiving terminal, disturb (intra-cell interference) in the sub-district so produced, two multiplexing subchannels interfere with each other, and cause that systematic function descends.
In the GSM network, whether support that frequency hopping is optional.The major advantage of frequency hopping is that frequency diversity gain (mobile subscriber especially at a slow speed) and cell interference diversity gain (promptly realizing disturbing average in each communication link) can be provided.
Suggestion according to GSM, the frequency hopping of base station radio channel is based on each physical channel, therefore for travelling carriage, and only need be once in the corresponding time slot saltus step of each frame, its frequency hopping rate was 217 jumping/seconds, and the tdma frame saltus step that promptly every duration is 4.615ms once.Travelling carriage sends and receives with fixing frequency in a time slot, need jump to next tdma frame then behind this time slot.
Two group of frequencies in the definition of cell parameter, have been defined, one is called cell allocation table (Cell Allocation) and is used for defining used all frequencies in this sub-district, and another is called as mobile allocation table (Mobile Allocation) and is used for defining all frequencies that participate in frequency hopping.Carry the carrier frequency of BCCH, can not be used for frequency hopping, because it carries FCCH, SCH and BCCH channel, all mobile phone broadcast synchronization message and the system messages that need not stop to this sub-district.
Frequency hop sequences is a quadrature in a sub-district, and different user can not jump on the same frequency simultaneously in the promptly same sub-district, and is independent in same area group.In the GSM standard, there are two parameters to be used for defining frequency hop sequences (Hopping Sequence), be respectively MAIO (Mobile Allocation Index Offset) and HSN (HSN).
MAIO describes the starting point of frequency hopping repeat function because of need, so the probable value of skew and the frequency number that participates in frequency hopping are as many.The frequency number of MA should be between 1 to 64, and producing frequency hop sequences will be through one very during the complicated algorithm process, and participating in parameters calculated has FN (T1, T2, the T3 value of current frame number and the description frame number that obtains from the SCH channel), MAIO, HSN.
The HSN value has 64 different values, and the channel of a common sub-district should have identical HSN value, different MAIO values, because this is the interference that will be avoided between the same cell channel, when same sub-district occurs will causing serious appointment mortality behind the identical MAIO.Two channels that have identical HSN, different MAIO can not use identical frequency at same burst (Burst), have avoided the collision of frequency in a sub-district.
Travelling carriage can obtain MA, HSN and MAIO by the cell parameter that provides in the system broadcast message, derives frequency hop sequences according to algorithm then, travelling carriage will know each frame should on which frequency transmission/received signal.
After introducing the VAMOS technology, according to existing GSM hopping scheme, two users that constitute VAMOSpair will use identical frequency at each tdma frame, that is to say, each user will go to disturb the pairing user of oneself continuously at every frame, like this, though obtained frequency diversity gain, not user diversity gain.Especially when system adopts the DTX technology,, user's energy and DTX user will improve the channel quality of oneself greatly if fitting over together.On the other hand, when system is fractional load (fractional load), promptly has and have only a user on some frequencies, like this, if press existing standard, those users that exclusively enjoy a frequency will be in unpaired state always, not be subjected to the co-channel interference in the sub-district.From the angle of system, the gain of interference diversity does not embody.
So, in the VAMOS system, needing to improve existing hopping scheme, improved basic principle is:
1) makes constantly to have two users to jump on same frequency at the most at each;
2) two users of pairing can be jumped on different frequencies after the some frames of every frame or interval, change the pairing situation between the user, guarantee that a user is not constantly disturbed by another user, to obtain user diversity gain and cell interference diversity gain.
Summary of the invention
The purpose of this invention is to provide the frequency-hopping method in a kind of GERAN/VAMOS system.
For achieving the above object, according to an aspect of the present invention, provide the frequency-hopping method in a kind of GERAN/VAMOS system, comprised step:
A), calculate the frequency that every frame uses according to the hopping scheme in the GSM standard at the user on the VAMOS subchannel 1;
B),,, calculate the frequency that present frame uses then in conjunction with HSN HSN and current frame number in the MAIO value of every frame or at interval some frame changes self at the user on the VAMOS subchannel 2.
According to a further aspect in the invention, propose the frequency-hopping method in a kind of GERAN/VAMOS system, comprised step:
A), calculate the frequency that every frame uses according to the hopping scheme in the GSM standard, and every frame rate saltus step once at the user on the VAMOS subchannel 1;
B) at the user on the VAMOS subchannel 2, the user on the described VAMOS subchannel 2 has fixing MAIO value, calculates the frequency that present frame uses according to the hopping scheme in the GSM standard, and every a frame or some frame rate saltus steps once.
In the GERAN/VAMOS system, adopt method of the present invention, not only need be at the mobile phone end frequency hop sequences that prestores, and also required extra signaling consumption is very little.Can guarantee that per moment can only have two same frequencies of CU at most, user can not be subjected to another user's interference continuously simultaneously.Adopt method of the present invention, only the user on the subchannel 2 is changed hopping scheme, do not change the user on the subchannel 1.When realizing frequency diversity and user diversity, do not bring extra computation complexity.
Description of drawings
Fig. 1 is the frame assumption diagram of gsm system;
Fig. 2 is the schematic diagram that the two users of GERAN/VAMOS system reuse same running time-frequency resource according to the present invention;
Fig. 3 is the schematic diagram that pairing user down link is modulated in the GERAN/VAMOS system according to the present invention;
Fig. 4 is according to the flow chart of improvement hopping scheme of the present invention.
Embodiment
After gsm system had been introduced the VAMOS technology, the improved basic principle of hopping scheme was:
1) at each constantly, can only there be two users to jump on same frequency at the most;
2) when obtaining frequency diversity gain, obtain cell interference diversity gain.
First method adopts the fast frequency-hopped-quick matching method based on circulation MAIO to can be used for the GERAN/VAMOS system, comprise step:
All users in the same sub-district have identical HSN (HSN) and mobile allocation table (MA).User on the subchannel 1 according to the computation schemes oneself in the existing GSM standard (TS45.002) in the used frequency of each tdma frame; User on the subchannel 2 at first gives the set (MAIOA of own initial MAIO value, current tdma frame number and available MAIO composition according to base station assigns, MAIO Allocation) calculates oneself in the MAIO of present frame value, and then, just can calculate the employed frequency of present frame according to the hopping scheme in the existing GSM standard in conjunction with the HSN and the current frame number of sub-district.Adopt this frequency-hopping method, frequency and pairing situation that the user uses all may change at every frame, can obtain the gain of frequency diversity gain and user diversity.
Second method, adopting at a slow speed, frequency hopping-quick matching method can be used for the GERAN/VAMOS system, comprises step:
All users in the same sub-district have identical HSN (HSN) and available frequency hopping frequency sets (MA).In this sub-district, the set that the user on all subchannels 1 is formed is referred to as to gather 1, and the set that the user on all subchannels 2 forms is referred to as to gather 2.Each user has changeless MAIO value, and is unique in the set under it.All users calculate own used frequency according to the hopping scheme in the existing GSM standard (TS45.002) in the sub-district, difference be on the subchannel 1 the user in each frame rate saltus step once, and per two frames of the user on the subchannel 2 or some frame rate saltus steps are once, and the frequency of frequency hopping is fixed.
The third method adopt based on circulation MAIO fast frequency-hopped-matching method can be used for the GERAN/VAMOS system at a slow speed, comprises step:
All users in the same sub-district have identical HSN (HSN) and available frequency hopping frequency sets (MA).User on the subchannel 1 according to the computation schemes oneself in the existing GSM standard (TS45.002) in the used frequency of each tdma frame; User on the subchannel 2 changes a MAIO value every a frame or some frames, and this depends on that the user of setting matches step-length.When present frame need change the MAIO value, the user gave own initial MAIO value, current tdma frame number, MAIOA value and MAIO change step-length according to base station assigns, calculates oneself in the MAIO of present frame value; If present frame does not need to change the MAIO value, then remain unchanged.After obtaining the MAIO value,, just can calculate the employed frequency of present frame according to the hopping scheme in the existing GSM standard in conjunction with the HSN and the current frame number of sub-district.
Can allow optionally the user carries out according to frequency hopping mode of the present invention on the subchannel 2.For example, utilize 1 remaining bits in broadcast channel or the descending SACCH channel to indicate the frequency of utilizing frequency-hopping method of the present invention or calculating the present frame use according to the hopping scheme in the GSM standard.Also utilize the bit 8 of first octet in the descending SACCH channel or utilize the bit 8 of the Octet 1 in one or more message among Cell Description in the broadcast channel, Cell Options, Channel Description, ChannelDescription 2 and the Channel Description 3 to indicate and utilize frequency-hopping method of the present invention or calculate the frequency that present frame uses according to the hopping scheme in the existing GSM standard.
Simultaneously, user's MAIO changes the step-length (being applied to second method) of step-length (being applied to first method and the third method) and frequency hopping, can do the self adaptation adjustment by descending broadcast channel or control channel.
In real system, the speed of frequency hopping and user's translational speed all can influence frequency diversity gain.When the user is in when mobile at a slow speed, frequency hopping fast more, frequency diversity gain is big more, and then step-length should be more little; As user during at high-speed motion, the decline of wireless channel changes very violent, and the gain of the frequency diversity that this moment is fast frequency-hopped is less, and then the frequency hopping step-length should be big more.So, in gsm system, can be according to the step-length of different scene adaptive ground configuration frequency hoppings.
First and the third method in, can obtain MAIOA by being received in the MAIOA that broadcasts on the broadcast channel.MAIOA also can (for example, SDCCH) be notified to the user by descending control channel when channel allocation.
Embodiment
This part has provided this inventive embodiment, and is too tediously long for fear of the description that makes this patent, in the following description, omitted the detailed description of function that the public is known or device etc.
Embodiment one
Employing can be used for the GERAN/VAMOS system based on fast frequency-hopped-quick matching method of circulation MAIO.
As shown in Figure 4, all users in the same sub-district have identical HSN (HSN) and available frequency hopping frequency sets (MA).User on the subchannel 1 has changeless MAIO value, and this is distributed at the channel establishment stage by the base station.So the user on the subchannel 1 can calculate own to the used frequency of each tdma frame according to the hopping scheme in the existing GSM standard (TS45.002), is shown below:
MAI＝f(FN，HSN，MAIO) (1)
ARFCN(FN)＝MA(MAI) (2)
Wherein, MAI represents the index of mobile allocation table MA, the computing function of the frequency hop sequences that provides among f (.) the expression TS45.002.So the user can learn according to (1), (2) in the frequency that the FN frame uses.
At this moment, the MAIO value of the user on the subchannel 2 is at each frame varying cyclically, and promptly user's initial MAIO value adds current tdma frame FN, again with MAIOA in the number delivery of element, be in the MAIO value that guarantees the user and gather among the MAIOA, be shown below:
MAIO(FN)＝(MAIO
0+FN)mod?M (3)
MAI＝f(FN，HSN，MAIO(FN)) (4)
ARFCN(FN)＝MA(MAI) (5)
Wherein, MAIO
0Be user's MAIO initial value, what M represented is the number of element among the MAIOA.
Because user's MAIO initial value sends to the user at the channel establishment stage by the base station on the subchannel 2, and in user's set of all use subchannels 2, be unique.Like this, just guaranteed to have only at the most two users to take same frequency simultaneously, and user's MAIO value is at every frame varying cyclically on the subchannel 2, so that user's pairing situation may change at every frame, thereby realized fast frequency-hopped-user's pairing fast, when obtaining frequency diversity gain, also obtained the user diversity gain.
The basic thought of this exemplary method is: user's MAIO value immobilizes on the subchannel 1, and its every frame rate saltus step once, and user's MAIO value is chosen possible MAIO value in the MAIOA set in every frame circulation on the subchannel 2.Except use the MAIO initial value add current frame number again with MAIOA value delivery, also can remove mould MAIOA with the difference of MAIO initial value and current frame number, produce the MAIO value of the every frame of user on the subchannel 2, perhaps allow MAIO change with fixing or variable step-length increasing or decreasing.It is good more to change the fast more randomness that then obtains.In addition, can also define the computational methods that the operation result of a variety of MAIO initial values and current frame number removes mould MAIOA again, too tediously long for fear of the present invention, do not repeat them here, but all within protection scope of the present invention.
Embodiment two
Adopting at a slow speed, frequency hopping-quick matching method can be used for the GERAN/VAMOS system.
All users in the same sub-district have identical HSN (HSN) and available frequency hopping frequency sets (MA).In this sub-district, the set that the user on all subchannels 1 is formed is referred to as to gather 1, and the set that the user on all subchannels 2 forms is referred to as to gather 2.Each user has changeless MAIO value, and is unique in the set under it.
User on the subchannel 1 calculates own in the used frequency of every frame, promptly in each frame rate saltus step once according to the hopping scheme in the existing GSM standard (TS45.002).
At this moment, per two frames of the user on the subchannel 2 or some frame rate saltus steps once, the step-length of frequency hopping can be pre-set fixed value, also can change the step-length of frequency hopping by downlink broadcast channel or control channel.The MAI of the every frame of user can calculate with following formula on the subchannel 2:
MAI＝f((FN?div?η)，HSN，MAIO) (6)
Wherein, η is the step-length of frequency hopping, and promptly every the η frame, frequency hopping once.Div represents to divide exactly.
In addition, also available following formula calculates the MAI of the every frame of user on the subchannel 2,
if(FN?mod?η＝＝0)
MAI＝f(FN，HSN，MAIO)；
(7)
else
MAI＝f((FN-FN?modη)，HSN，MAIO)；
Wherein, mod represents modular arithmetic.
The basic thought of this exemplary method is to allow all users' MAIO value immobilizes in the sub-district, the every frame rate saltus step of the user on the subchannel 1 once, and the user is every a frame or some frame rate saltus steps once on the subchannel 2.That is to say, allow the frequency hopping frequency of user on the subchannel 2 less than user on the subchannel 1.In addition, some other allows user's frequency hopping frequency does not wait on subchannel 1 and the subchannel 2 frequency-hopping method all within protection range of the present invention.
Embodiment three
Employing based on circulation MAIO fast frequency-hopped-matching method can be used for the GERAN/VAMOS system at a slow speed.
All users in the same sub-district have identical HSN (HSN) and available frequency hopping frequency sets (MA).User on the subchannel 1 has changeless MAIO value, and can calculate own to the used frequency of each tdma frame according to the hopping scheme in the existing GSM standard (TS45.002).
At this moment, the user on the subchannel 2 changes a MAIO value every a frame or some frames, and MAIO value of concrete at interval several frames changes depends on that the user of setting matches step-length.
In gsm system, up SACCH channel is used for sending user's measurement report, and the base station uses descending SACCH to tell how the user adjusts power then.So user's pairing step-length can be one or more SACCH cycle, stablizing between two users that help realizing matching.Here, the pairing step-length is big more, and diversity gain is low more, but the stability of power control is high more, otherwise diversity gain increases, but the stability of power control reduces.Therefore, can come the pairing step-length is adjusted according to the actual conditions of system in actual applications.
In fact, the pairing step-length is corresponding with two users' the pairing cycle.The pairing cycle is meant that in the same sub-district, two users take the frame number of identical time slot, same frequency continuously.Can change two users' the pairing cycle by frequency hopping.
If λ matches step-length for the user, when present frame need change the MAIO value, when promptly the present frame frame number was the integral multiple of λ, the user gave the initial MAIO value MAIO of oneself on the subchannel 2 according to base station assigns
0, current tdma frame FN, MAIOA value and MAIO change step-length, calculates own to the MAIO of present frame value; If present frame does not need to change the MAIO value, then the MAIO value remains unchanged, and matches situation thereby continue to keep current user.After obtaining the MAIO value,, just can calculate the employed frequency of present frame according to the hopping scheme in the existing GSM standard in conjunction with the HSN and the current frame number of sub-district.
The concrete following expression of MAIO computational process:
if(FN?modλ＝＝0)
MAIO(FN)＝(MAIO
0+η×FN)mod?M；
(8)
else
MAIO(FN)＝(MAIO
0+η×(FN-FN?modλ))mod?M；
MAI＝f(FN，HSN，MAIO(FN))?(9)
The basic thought of this exemplary method is to allow user's MAIO value immobilizes on the subchannel 1, and once in every frame rate saltus step, and the user on the subchannel 2 changes a MAIO value every a frame or some frames, and MAIO value of concrete at interval several frames changes depends on that the user of setting matches step-length.MAIO is worth shifting gears and can adds that certain incremental steps removes mould MAIOA again with the MAIO initial value.In addition, can also define the computational methods that the operation result of a variety of MAIO initial values and current frame number removes mould MAIOA again, too tediously long for fear of the present invention, do not repeat them here, but all within protection scope of the present invention.
Claims (18)
1. the frequency-hopping method in the GERAN/VAMOS system comprises step:
A), calculate the frequency that every frame uses according to the hopping scheme in the GSM standard at the user on the VAMOS subchannel 1;
B),,, calculate the frequency that present frame uses then in conjunction with HSN HSN and current frame number in the MAIO value of every frame or at interval some frame changes self at the user on the VAMOS subchannel 2.
2. method according to claim 1 is characterized in that, the hopping scheme in the described GSM standard is the TS45.002 standard.
3. method according to claim 1 is characterized in that, the user on the subchannel 2 changes the MAIO value of self at every frame.
4. method according to claim 1 is characterized in that, the user on the subchannel 2 changes a MAIO value every a frame or some frames, and every frame rate saltus step once.
5. according to claim 3 or 4 described methods, it is characterized in that, utilize available MAIO value set MAIOA to calculate the MAIO value of user on the subchannel 2.
6. according to claim 3 or 4 described methods, it is characterized in that, come the MAIO value of the user on the increasing or decreasing subchannel 2 by default fixed step size, and then with MAIOA in the element number delivery with assurance user's MAIO value in described MAIOA.
7. method according to claim 5 is characterized in that, obtains MAIOA by being received in the MAIOA that broadcasts on the broadcast channel.
8. method according to claim 1 is characterized in that, according to descending broadcast channel or control channel come on the adaptively modifying subchannel 1 and subchannel 2 on user's pairing step-length.
9. method according to claim 1 is characterized in that, comes the change step of the MAIO value of user on the adaptively modifying subchannel 2 according to descending broadcast channel or control channel.
10. according to Claim 8 or 9 described methods, it is characterized in that, come the change step of MAIO value of user on the adaptively modifying subchannel 2 and user to match step-length based on user diversity gain and power control stability.
11. the frequency-hopping method in the GERAN/VAMOS system comprises step:
A), calculate the frequency that every frame uses according to the hopping scheme in the GSM standard, and every frame rate saltus step once at the user on the VAMOS subchannel 1;
B) at the user on the VAMOS subchannel 2, the user on the described VAMOS subchannel 2 has fixing MAIO value, calculates the frequency that present frame uses according to the hopping scheme in the GSM standard, and every a frame or some frame rate saltus steps once.
12. method according to claim 11 is characterized in that, the hopping scheme in the described GSM standard is the TS45.002 standard.
13. method according to claim 11 is characterized in that, user's frequency hopping frequency is unequal on subchannel 1 and the subchannel 2, thereby changes user's pairing situation.
14. method according to claim 11 is characterized in that, described step b) comprises that the frequency according to frequency hopping changes the frame number of present frame, and frame number, HSN and MAIO value after the use change are calculated the frequency of present frame.
15. method according to claim 11 is characterized in that, according to the frequency hopping step-length of user on descending broadcast channel or the control channel adaptively changing subchannel 2.
16. according to claim 1 or 11 described methods, also comprise step: carry out before the described step b), utilize 1 remaining bits in broadcast channel or the descending SACCH channel to indicate the frequency of utilizing step b) or calculating the present frame use according to the hopping scheme in the GSM standard.
17. according to claim 1 or 11 described methods, it is characterized in that, carry out before the described step b), utilize the bit 8 of first octet in the descending SACCH channel to indicate the frequency of utilizing step b) or calculating the present frame use according to the hopping scheme in the GSM standard.
18. according to claim 1 or 11 described methods, it is characterized in that, carry out before the described step b), utilize the bit 8 of the Octet 1 in one or more message among Cell Description in the broadcast channel, Cell Options, ChannelDescription, Channel Description 2 and the Channel Description 3 to indicate the frequency of utilizing step b) or calculating the present frame use according to the hopping scheme in the GSM standard.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101381936A CN101882946A (en) | 2009-05-08 | 2009-05-08 | Frequency-hopping method in GERAN (GSM EDGE Radio Access Network)/VAMOS (Voice services over Adaptive Multi-user channelson One Slot) system |
| PCT/KR2010/002959 WO2010128837A2 (en) | 2009-05-08 | 2010-05-10 | Frequency hopping method in geran/vamos system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101381936A CN101882946A (en) | 2009-05-08 | 2009-05-08 | Frequency-hopping method in GERAN (GSM EDGE Radio Access Network)/VAMOS (Voice services over Adaptive Multi-user channelson One Slot) system |
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| CN101882946A true CN101882946A (en) | 2010-11-10 |
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| CN2009101381936A Pending CN101882946A (en) | 2009-05-08 | 2009-05-08 | Frequency-hopping method in GERAN (GSM EDGE Radio Access Network)/VAMOS (Voice services over Adaptive Multi-user channelson One Slot) system |
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| WO (1) | WO2010128837A2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104221416A (en) * | 2014-04-18 | 2014-12-17 | 华为技术有限公司 | Frequency hopping sequence planning method and device |
| CN104641565A (en) * | 2013-02-19 | 2015-05-20 | 华为技术有限公司 | Selecting method and selecting device for mobile allocation index offset |
| CN105493430A (en) * | 2013-02-19 | 2016-04-13 | 华为技术有限公司 | Data transmitting and receiving method and device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105873075B (en) * | 2016-04-08 | 2019-05-07 | 江苏中科羿链通信技术有限公司 | The frequency point selecting method of wireless chain topological network node |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6473418B1 (en) * | 1999-03-11 | 2002-10-29 | Flarion Technologies, Inc. | Orthogonal frequency division multiplexing based spread spectrum multiple access |
| US8165594B2 (en) * | 2006-08-21 | 2012-04-24 | Interdigital Technology Corporation | Resource allocation, scheduling, and signaling for grouping real time services |
-
2009
- 2009-05-08 CN CN2009101381936A patent/CN101882946A/en active Pending
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104641565A (en) * | 2013-02-19 | 2015-05-20 | 华为技术有限公司 | Selecting method and selecting device for mobile allocation index offset |
| CN105493430A (en) * | 2013-02-19 | 2016-04-13 | 华为技术有限公司 | Data transmitting and receiving method and device |
| CN104641565B (en) * | 2013-02-19 | 2017-04-12 | 华为技术有限公司 | Selecting method and selecting device for mobile allocation index offset |
| CN104221416A (en) * | 2014-04-18 | 2014-12-17 | 华为技术有限公司 | Frequency hopping sequence planning method and device |
| WO2015158002A1 (en) * | 2014-04-18 | 2015-10-22 | 华为技术有限公司 | Frequency hopping sequence planning method and device |
| CN104221416B (en) * | 2014-04-18 | 2018-03-13 | 华为技术有限公司 | A kind of frequency hop sequences method and device for planning |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010128837A3 (en) | 2011-02-24 |
| WO2010128837A2 (en) | 2010-11-11 |
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