CN102158253B - Method for transmitting frequency hopping signaling and method for configuring frequency hopping mode and dispatching signaling - Google Patents
Method for transmitting frequency hopping signaling and method for configuring frequency hopping mode and dispatching signaling Download PDFInfo
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Abstract
The invention discloses a method for transmitting frequency hopping signaling, which comprises the following steps: step S202, using a base station to pre-distribute frequency hopping parameters for users, and enabling the users to perform frequency hopping transmission according to the frequency hopping parameters; and step S204, enabling the users to use the pre-distributed frequency hopping parameters when the users request the dispatching, or using the base station to perform the frequency hopping transmission on new frequency hopping parameters distributed by the base station for the users. In addition, the invention further discloses a method for configuring frequency hopping mode and dispatching signaling. By using the invention, all the users in neighborhood can be always kept orthogonal, so that the interference on the users is randomized, bandwidth single granularity and multi-granularity can be retained to always keep the continuity of occupying subcarriers, and the demand of the signaling is reduced.
Description
The application is that the application number of submitting on June 15th, 2007 is 200710126184.6, the dividing an application of the application for a patent for invention that denomination of invention is " launching technique of frequency-hopping signaling, frequency-hopping mode and dispatch collocation method ".
Technical field
The present invention relates to the frequency modulation method of single carrier-frequency division multiple access system uplink multi-users in the 3GPP LTE of the communications field, particularly, relate to a kind of launching technique and frequency-hopping mode and dispatch collocation method of frequency-hopping signaling.
Background technology
In order to meet the demand to the mobile communication of development, aspect the selection of uplink radio transmission technology, there are some basic demands, for example, the orthogonality etc. of supporting scalable bandwidth, moderate PAPR/CM (peak-to-average force ratio/cubic meter) and guaranteeing uplink.Due to single carrier transmission scheme (for example, single-carrier frequency division multiple access (SC-FDMA)) there is lower PAPR/CM, so can put forward high-power validity and expand the coverage area, therefore becoming the basic candidate scheme of current Long Term Evolution (LTE) uplink.
Data transmission scheme based on subcarrier mapping mode has two kinds, that is, and and distributed frequency division multiple access (DFDMA) and centralized frequency division multiple access (LFDMA).Because the scheme based on distributed sub-carrier allocation in up link has higher susceptibility to frequency mistake, so exist to uplink power control have relatively high expectations, the problem such as channel estimating performance is poor, by the research of LTE, abandoned at present, but the scheme of distributing based on centralized subcarrier, still can obtain in the mode of frequency hopping the advantage of the intrinsic frequency diversity of distributed sub-carrier.In the single carrier transmission scheme LFDMA-FH that most manufacturers is recommended (LFDMA-frequency hopping), used frequency hopping (Frequency Hopping), both can guarantee good channel estimating performance, frequency diversity gain can be obtained again, and cell interference diversity gain can be obtained.
The transmission of eating dishes without rice or wine of existing evolved mobile communication system or next generation mobile communication system is packet-based, for user's Resources allocation means, are dispatching management based on overall, and (for example in packet-based air interface, transmit business that class continuity connects, voice service, video traffic, game application etc.) time, must be by QoS (Quality of Service, service quality) indexs such as its specific time delay of special dispatch deal guarantee, shakes.
Conventional a kind of scheduling means that solve class continuity connection business are semi-stability (persistent) scheduling at present.As shown in Figure 1, semi-stability scheduling is characterised in that considers that conversational class business exists this feature of voice quiet period,, if user carries out resource request, distribute a resource to use to user, if enter quiet period, releasing resource is used to other users, therefore, the use of resource is continual and steady in time; Under special circumstances, if user does not obtain the clearly response of request, user is transmitted in predefined resource.But, in this case, if the use of resource is always stable, cannot utilize the advantage of dispatching flexibility, and under typical frequency selective fading channels, there will be the situation of long period in deep fade interval, thereby the increase of the difficulty that causes communicating by letter.
Therefore, cannot realize at present the stability feature of business and the frequency diversity gain that frequency hopping is brought simultaneously.
Summary of the invention
Consider the problems referred to above and make the present invention, for this reason, main purpose of the present invention is to provide a kind of launching technique of frequency-hopping signaling, and a kind of frequency-hopping mode and dispatch collocation method are provided.
According to embodiments of the invention, provide a kind of launching technique of frequency-hopping signaling.
The method comprises: step S202, and base station is user's preassignment frequency parameter, and user carries out frequency hopping transmitting according to frequency parameter; Step S204, when user's request scheduling, user uses preallocated frequency parameter, or uses the new frequency parameter that base station is its distribution to carry out frequency hopping transmitting.
Wherein in step S202, user can, after user establishes the link with base station, without asking by user, be notified by the mode of broadcast or layer 3 signaling for user's preassignment frequency parameter in base station.
Wherein, in step S204, when user is user inside the group, base station adopts group scheduling signaling to notify user by user's schedule information or scheduling authorization, wherein, using the user's frequency bandwidth demand information in user's schedule information or scheduling authorization or Adaptive Modulation information as frequency parameter, or relative position offset information is as frequency parameter in the customer group in user's schedule information or scheduling authorization.And in step S202, when user is user inside the group, base station can also adopt group scheduling signaling to notify user by frequency parameter.
On the other hand, in step S204, when user is not user inside the group, base station adopts alone family dispatch to notify user by user's schedule information or scheduling authorization, wherein, using the user's frequency bandwidth demand information in user's schedule information or scheduling authorization or Adaptive Modulation information as frequency parameter.
In addition, in step S204, when user is not user inside the group, base station adopts alone family dispatch to notify user by frequency parameter.
In user's frequency hopping process, when user needs retransmission data packet may, the frequency-hopping resource that user's frequency hopping is used or the resource being configured by dispatch are carried out retransmission data packet may.
In addition,, in step S204, base station determines whether as the new frequency parameter of user assignment according to the situation that takies of the situation of change of user's schedule information or scheduling authorization or former frequency-hopping resource.Wherein, the situation of change of user's schedule information or scheduling authorization at least comprises the changes in demand information of the physical resource of user's needs, and wherein, physical resource comprises: user's frequency bandwidth.And when the demand of user's frequency bandwidth changes, or former frequency-hopping resource is when occupied, base station is the new frequency parameter of user assignment, and wherein, above-mentioned variation comprises: demand by changeable less, demand is many by few change.
In step S202 or S204, in user's frequency hopping process, base station can be used alone family dispatch to change by force the frequency-hopping resource that user uses.
In addition, the method may further include following processing: when base station detects user without data transmission, or user is while asking not transmitting data, and user stops frequency hopping.
According to another embodiment of the present invention, a kind of frequency-hopping mode and dispatch collocation method are provided.
In the method: the in the situation that in system, all or part of frequency hopping user adopting respectively different frequency bandwidth: user adopts group frequency-hopping mode, dispatch is configured to alone family dispatch; Or user adopts multi-granule frequency-hopping mode, dispatch is configured to group scheduling signaling; And in system, all or part of frequency hopping user adopts same frequency bandwidth in the situation that: user adopts individual particle degree frequency-hopping mode.
Wherein, under group's frequency-hopping mode: the user of variable grain degree is put into one or more virtual groups; To forming a plurality of virtual groups of same frequency resources width, adopt individual particle degree frequency-hopping method to carry out frequency hopping, determine group's original position, then by user inside the group's relative position skew, determine user inside the group's initial frequency position.Here, alone family dispatch comprise following one of at least or its combination in any: in customer group numbering, group, relative position skew, group's total quantity is, group's bandwidth demand, stepped-frequency interval.
In addition, under multi-granule frequency-hopping mode: determine the Frequency Hopping pattern i of each user k, wherein, i=g (k); According to the frequency domain transmitting numbering i of definite user k and each user's bandwidth demand X (k) separately, by
determine the initial frequency f (i) of user k.Wherein, group scheduling signaling at least comprises a plurality of users' frequency bandwidth demand.
On the other hand, under individual particle degree frequency-hopping mode: determine the Frequency Hopping pattern i of each user k, wherein, i=g (k); According to the frequency domain transmitting numbering i of above definite user k and each user's equal bandwidth demand X (k), by
determine the initial frequency f (i) of user k.
By technique scheme of the present invention, combine semi-stability scheduling and specific frequency-hopping mode, obtained larger frequency diversity gain, guaranteed the business continuance of up link simultaneously; In addition, can make to remain quadrature between inner each user in community, the interference randomization that user is subject to, and can support bandwidth individual particle degree, multi-granule to remain the continuity that takies subcarrier, reduce the demand of signaling.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of the semi-stability scheduling of correlation technique;
Fig. 2 is according to the flow chart of the launching technique of the frequency-hopping signaling of the embodiment of the present invention;
Fig. 3 is according to the schematic diagram of group's signaling structure example of the embodiment of the present invention;
Fig. 4 follows the schematic diagram of frequency-hopping mode according to data packet retransmission in the launching technique of the frequency-hopping signaling of the embodiment of the present invention; And
Fig. 5 follows the schematic diagram of signal deployment pattern according to data packet retransmission in the launching technique of the frequency-hopping signaling of the embodiment of the present invention.
Embodiment
Before describing embodiments of the invention, first by describe the present invention based on semi-stability scheduling mode.According to the feature of described before semi-stability scheduling, with reference to Fig. 1, the in the situation that up user initiatively not distributing instant resource in base station, according to predefined temporal frequency resource, carry out transfer of data, if descending, provide confirmation, next corresponding voice IP (VoIP) packet of transmission; If base station cannot demodulating data, and when providing unacknowledged information requirement and retransmitting, user's retransmission data packet may, when without transfer of data, enters quiet period, and user can send releasing resource signaling.And if need releasing resource, except user sends release signaling, base station also can enter quiet period by the method judgement UE of blind Detecting.User, after release, in the time of need to again initiating business, need to carry out dispatch request, then according to the corresponding resource of descending distribution, launches.
Based on semi-stability scheduling described above, the embodiment of the present invention combines semi-stability scheduling and specific frequency-hopping mode, has proposed a kind of hopping scheme based on semi-stability, hereinafter with reference to accompanying drawing, describes embodiments of the invention in detail.
Embodiment of the method one
A kind of launching technique of the frequency-hopping signaling based on semi-stability scheduling is provided in the present embodiment.
As shown in Figure 2, according to the launching technique of the frequency-hopping signaling of the present embodiment, comprise: step S202, base station is user's preassignment (predefine) frequency parameter, and user carries out frequency hopping transmitting according to frequency parameter; Step S204, when user's request scheduling, user uses preallocated frequency parameter, or uses the new frequency parameter that base station is its distribution to carry out frequency hopping transmitting.
Preferably, on the basis of the above-mentioned processing shown in Fig. 2, may further include following processing: when base station detects user without data transmission, or user is while asking not transmitting data, and user stops frequency hopping.
Wherein in step 202, user can, after user establishes the link with base station, without asking by user, be notified by the mode of broadcast or layer 3 signaling for user's preassignment frequency parameter in base station.
In user's frequency hopping process, base station can pro-active intervention frequency hopping process, for example, in step S202 or step S204, base station can be used alone family dispatch to change by force the frequency-hopping resource that user uses, that is, force users is not used original resource and is changed the somewhere resource (forcing as shown in Figure 5 change frequency-hopping mode) of using other into.
Wherein, in step S204, when user is user inside the group, base station adopts group scheduling signaling (Group schedule Signaling, also can be called group's signaling) by user's schedule information or scheduling authorization (schedule grant), notify user, in this case, using the user's frequency bandwidth demand information in user's schedule information or scheduling authorization or Adaptive Modulation (AMC) information as frequency parameter.In addition, user's schedule information or scheduling authorization can also comprise the information of relative position skew in customer group, and equally can be by this information as frequency parameter.
In addition,, when user is user inside the group, base station can adopt group scheduling signaling directly by frequency parameter, to notify user.
On the other hand, in step S204, when user is not user inside the group, base station adopts alone family dispatch to notify user by user's schedule information or scheduling authorization, equally, in this case, using the user's frequency bandwidth demand information in user's schedule information or scheduling authorization or Adaptive Modulation information as frequency parameter.
In addition, in step S204, when user is not user inside the group, base station adopts alone family dispatch to notify user by frequency parameter.
The example of the structure of group scheduling signaling has been shown in Fig. 3.As shown in Figure 3, group scheduling signaling comprises: use cyclic redundancy check (CRC) (CRC), the indication of group's resource starting point, every user's transformat of group number coding or activate indication.Wherein, from the CRC of group number coding, can detect group number, from relativeness and the transformat of each user position signaling, describe, can know group interior relative position skew.The frequency bandwidth demand that comprises a plurality of users in group in user's transformat.
In addition,, in step S204, base station determines whether as the new frequency parameter of user assignment according to the situation that takies of the situation of change of user's schedule information or scheduling authorization or former frequency-hopping resource.
Wherein, the situation of change of user's schedule information or scheduling authorization at least comprises the changes in demand information of the physical resource (for example, user's frequency bandwidth) of user's needs.And, when the demand of user's frequency bandwidth change (comprise demand by changeable less, demand is many by few change), or former frequency-hopping resource is when occupied, base station is the new frequency parameter of user assignment.
In user's frequency hopping process, when user needs retransmission data packet may, the frequency-hopping resource that user's frequency hopping is used or the resource being configured by dispatch are carried out retransmission data packet may, and particularly, Fig. 4 and Fig. 5 have described respectively this two kinds of situations.
Fig. 4 shows semi-stability scheduling in conjunction with the schematic diagram of frequency hopping, and wherein frequency-hopping mode is followed in the re-transmission of packet.As shown in Figure 4, user is by a set of frequency parameter of preassignment (predefine) (parameter comprises the information such as resource initial position), if enter quiet period, resource is discharged to other users and use, the use of resource is continual and steady in time, is predefined frequency-hopping mode in frequency.When up user is when having transfer of data, first according to the resource of preassignment (predefine), transmit, wherein when base station cannot demodulating data, and when providing unacknowledged information requirement and retransmitting, user's retransmission data packet may, the packet retransmitting can be followed predefined frequency-hopping mode, also can not follow predefined frequency-hopping mode.
Fig. 5 shows semi-stability scheduling in conjunction with the schematic diagram of frequency hopping, and wherein signal deployment pattern is followed in the re-transmission of packet, and can determine the resource that the packet of re-transmission takies according to dispatch, so this is a kind of adaptive retransmission mode.In this case, if descending, provide confirmation, the next corresponding VoIP packet of transmission; When without transfer of data, enter quiet period, user can send releasing resource signaling, releasing resource.Equally, not necessarily, base station also can enter quiet period by the method judgement UE of blind Detecting to release signaling.When user need to initiate business again, by dispatch request order, by downlink signaling dispensing resource used, transmitted.
Embodiment of the method two
In the present embodiment, a kind of frequency-hopping mode and dispatch collocation method are provided.
The method comprises following processing: the in the situation that in system, all or part of frequency hopping user adopting respectively different frequency bandwidth: user adopts group frequency-hopping mode, dispatch is configured to alone family dispatch; Or user adopts multi-granule frequency-hopping mode, dispatch is configured to group scheduling signaling; And in system, all or part of frequency hopping user adopts same frequency bandwidth in the situation that: user adopts individual particle degree frequency-hopping mode.
Above various patterns will be described in detail below.
1, group's frequency-hopping mode
Under group's frequency-hopping mode, carry out following processing: (1) puts into one or more virtual groups by the user of variable grain degree, for example, the user that frequency resources width can be surpassed to M/2 is included into different groups, and be filled in virtual groups, wherein, M is group's frequency resources width; (2) to forming a plurality of virtual groups of same frequency resources width, adopt individual particle degree frequency-hopping method to carry out frequency hopping, determine group's original position, then by user inside the group's relative position skew, determine user inside the group's initial frequency position.Here, alone family dispatch comprise following one of at least or its combination in any: in customer group numbering, group, relative position skew, group's total quantity is, group's bandwidth demand, stepped-frequency interval.
Wherein, if the group who sets up in step (1) can not hold all users completely, the user who frequency resources width is surpassed to N/2 in remaining users sets up and is included into new group, and be filled in this new group, until complete all tenant groups, wherein, N is the maximum resource width in remaining users.
Preferably, when reality is implemented, in execution step (1) before, first according to hiving off towards the user who possesses different acquisition frequency width, that is, set up the group of different frequency width, the group of different frequency width is multiplexing on nonoverlapping frequency and time resource, carries out respectively frequency hopping; And hive off according to the user who requires towards different QoS, the user who is about to based on same QoS grade is divided in same group.
2, multi-granule frequency-hopping mode
Under multi-granule frequency-hopping mode, carry out following processing: determine the Frequency Hopping pattern i of each user k, wherein, i=g (k); According to the frequency domain transmitting numbering i of definite user k and each user's bandwidth demand X (k) separately, by
determine the initial frequency f (i) of user k.Wherein, group scheduling signaling at least comprises a plurality of users' frequency bandwidth demand.
In above-mentioned steps (2), can adopt continuous frequency division multiple address system based on Latin side to determine the frequency-hopping method of initial frequency, its deterministic process comprises the following steps:
When moment j, user k be take the frequency transmitting that original position is f (k, j),
Wherein, the frequency hopping scope of system is N Resource Unit or subcarrier, total K user, and each user's bandwidth demand is X (k), k=0,1 ..., K-1, meets
m is a prime number that is more than or equal to K; α=1,2 ..., M-1; I=((k-j) α
-1) modM, i=0,1 ..., M-1; It is different value that neighbor cell arranges stepped-frequency interval α.
In the method, each user's bandwidth demand X (k) can equate,, can deteriorate to individual particle degree frequency-hopping method that is.
And, in above-mentioned steps (2), can adopt continuous frequency division multiple address system based on COSTAS sequence to determine the frequency-hopping method of initial frequency, now, comprise following processing:
When moment j, user k be take the frequency transmitting that original position is f (k, j),
Wherein, the frequency hopping scope of system is N Resource Unit or subcarrier, total K user, and each user's bandwidth demand is X (k), k=0,1 ..., K-1, meets
p=M+1 is a prime number that is greater than K; α is the primitive root of p;
When k-j-1 ≠ 0, i=(log
α(k-j-1) mod (p-1)) mod p-1; I=0,1 ..., M-1;
When k-j-1=0, i=(log
α(p-1)) mod p-1, i=0,1 ..., M-1.
Each user's bandwidth demand X (k) can equate in the method,, can deteriorate to individual particle degree frequency-hopping method that is.
3, individual particle degree frequency-hopping mode
Under individual particle degree frequency-hopping mode: determine the Frequency Hopping pattern i of each user k, wherein, i=g (k); According to the frequency domain transmitting numbering i of above definite user k and each user's equal bandwidth demand X (k), by
determine the initial frequency f (i) of user k.
Wherein, in system, all or part of frequency hopping user adopts in the situation of same frequency bandwidth, user adopts individual particle degree frequency-hopping mode, it determines that the process of the initial frequency of resource is aforementioned multi-granule frequency hopping process, at each user's bandwidth demand X (k), equates to deteriorate to individual particle degree frequency-hopping method in situation.
Alternatively, in above-mentioned steps (2), can adopt based on Latin side and determine the initial frequency of individual particle degree continuous frequency division multiple address system frequency hopping, comprise following processing:
At moment j, user k be take the frequency transmitting that original position is f (k, j), wherein,
f(k，j)＝{[(G-j)α
-1]modM}R+β
Here, the frequency hopping scope of system is N wireless resource block, according to user's maximum bandwidth demand R, total bandwidth is divided into M group G,
represent to be not more than the maximum positive integer of N/R, G=0,1 ..., M-1 is the frequency hopping group at user k place; The user who assigns in same a group G distinguishes according to user's phase deviation β, β=0, and 1 ..., R-1; Each user's bandwidth demand is X (k), k=0, and 1 ..., K-1, meets
α is stepped-frequency interval, α=1, and 2 ..., M-1.
In addition, in step (2), can adopt based on Costas sequence method and determine the initial frequency of individual particle degree continuous frequency division multiple address system frequency hopping, now, comprise following processing:
At moment j, user k be take the frequency transmitting that original position is f (k, j), wherein,
f(k，j)＝{[(log
α(G-j-1)mod(p-1))mod?p-1]modM}T+β，
Here, the frequency hopping scope of system is N wireless resource block, according to user's maximum bandwidth demand R, total bandwidth is divided into M group G,
represent to be not more than the maximum positive integer of N/R, bandwidth T is group's bandwidth, and T is more than or equal to R, G=0, and 1 ..., M-1 is the frequency hopping group at user k place; The user who assigns in same a group G distinguishes according to user's phase deviation β, β=0, and 1 ..., T-1 is the phase deviation of this user in frequency hopping group, each user's bandwidth demand is X (k), and k=0,1 ..., K-1, meets
p=M+1; P is prime number, and α is stepped-frequency interval, and α is the primitive root of p.
In addition, in above-mentioned steps (2), can also adopt the method based on constant offset to determine the initial frequency of individual particle degree continuous frequency division multiple address system frequency hopping, now, comprise following processing:
At moment j, user k be take the frequency transmitting that original position is f (k, j), wherein,
f(k，j)＝(f(k，j-1)+γ)modN
Wherein, γ is frequency hopping spacing, the frequency hopping scope that N is system.
In sum, the present invention combines semi-stability scheduling and specific frequency-hopping mode, and a kind of hopping scheme based on semi-stability scheduling is provided, the stability feature of the business of both having coincide, and the frequency diversity gain of utilizing again frequency hopping to bring, improves power system capacity.By means of technical scheme of the present invention, can be according to remaining quadrature between inner each user in predefined frequency pattern frequency hopping ，Shi community; Under many cell environments, in 1 hop period only there is 1 collision in user each other, thus the interference randomization that user is subject to; In addition, the present invention supports bandwidth individual particle degree, multi-granule to remain the continuity that takies subcarrier; Because the present invention adopts semi-stability scheduling method frequency hopping, signaling requirement amount is less.
The present invention goes for the single carrier-frequency division multiple access system of the bandwidth varyings such as 1.25M, 5M, 2.5M, 10M, 15M, 20M, for example, DFT spread-spectrum orthogonal frequency division multiplexing (DFT-S OFDM) and interlaced FDMA access (IFDMA) system, and go for the application scenarios of 3km/h, 30km/h, 120km/h or higher rate travel.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. frequency-hopping mode and a dispatch collocation method, is characterized in that,
The in the situation that in system, all or part of frequency hopping user adopting respectively different frequency bandwidth:
User adopts group frequency-hopping mode, and dispatch is configured to alone family dispatch; Or
User adopts multi-granule frequency-hopping mode, and dispatch is configured to group scheduling signaling;
The in the situation that in system, all or part of frequency hopping user adopting same frequency bandwidth:
User adopts individual particle degree frequency-hopping mode.
2. frequency-hopping mode according to claim 1 and dispatch collocation method, is characterized in that, under described group's frequency-hopping mode:
The user of variable grain degree is put into one or more virtual groups;
To forming a plurality of virtual groups of same frequency resources width, adopt individual particle degree frequency-hopping method to carry out frequency hopping, determine group's original position, then by user inside the group's relative position skew, determine user inside the group's initial frequency position.
3. frequency-hopping mode according to claim 2 and dispatch collocation method, it is characterized in that, described alone family dispatch comprise following one of at least or its combination in any: in customer group numbering, group, relative position skew, group's total quantity is, group's bandwidth demand, stepped-frequency interval.
4. frequency-hopping mode according to claim 1 and dispatch collocation method, is characterized in that, under described multi-granule frequency-hopping mode:
Determine the Frequency Hopping pattern i of each user k, wherein, k is positive integer, i=g (k);
According to the frequency domain transmitting numbering i of above definite user k and each user's bandwidth demand X (k) separately, by
determine the initial frequency f (i) of user k.
5. frequency-hopping mode according to claim 4 and dispatch collocation method, is characterized in that, described group scheduling signaling at least comprises a plurality of users' frequency bandwidth demand.
6. frequency-hopping mode according to claim 1 and dispatch collocation method, is characterized in that, under described individual particle degree frequency-hopping mode:
Determine the Frequency Hopping pattern i of each user k, wherein, k is positive integer, i=g (k);
According to the frequency domain transmitting numbering i of above definite user k and each user's equal bandwidth demand X (k), by
determine the initial frequency f (i) of user k.
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| WO2017080510A1 (en) * | 2015-11-13 | 2017-05-18 | 中兴通讯股份有限公司 | Information delivery method and device |
| US11063652B2 (en) * | 2017-03-07 | 2021-07-13 | Apple Inc. | Techniques for improved beam management |
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| CN1540877A (en) * | 2003-04-25 | 2004-10-27 | ��˹��ŵ�� | Data tramsitting method, system and network unit |
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