WO2009021348A1 - Method for allocating resource of mobile user and resource allocating dispatcher using such policy - Google Patents

Method for allocating resource of mobile user and resource allocating dispatcher using such policy Download PDF

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Publication number
WO2009021348A1
WO2009021348A1 PCT/CN2007/002402 CN2007002402W WO2009021348A1 WO 2009021348 A1 WO2009021348 A1 WO 2009021348A1 CN 2007002402 W CN2007002402 W CN 2007002402W WO 2009021348 A1 WO2009021348 A1 WO 2009021348A1
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Prior art keywords
frequency hopping
resource allocation
subframe
resource
mapping sequence
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PCT/CN2007/002402
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English (en)
French (fr)
Inventor
Xudong Zhu
Mingli You
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Alcatel Shanghai Bell Co., Ltd.
Alcatel Lucent
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Application filed by Alcatel Shanghai Bell Co., Ltd., Alcatel Lucent filed Critical Alcatel Shanghai Bell Co., Ltd.
Priority to US12/672,560 priority Critical patent/US20110134853A1/en
Priority to PCT/CN2007/002402 priority patent/WO2009021348A1/zh
Priority to JP2010520394A priority patent/JP5539200B2/ja
Priority to CN200780053785.7A priority patent/CN101743773B/zh
Priority to EP07785307.5A priority patent/EP2180757B1/en
Publication of WO2009021348A1 publication Critical patent/WO2009021348A1/zh

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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
    • 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
    • H04B1/7143—Arrangements for generation of hop patterns
    • 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

Definitions

  • the present invention relates to the field of mobile communications, and more particularly to a mobile user resource allocation method and a resource allocation scheduler. Background technique
  • channel-based frequency selective (FS) scheduling is one of the main techniques in distributed dynamic radio resource management.
  • FS frequency selective
  • FS scheduling must allocate more bandwidth to users at the cell edge. This leads to a reduction in spectral efficiency, which in turn leads to a degradation of the performance of the entire cell.
  • FS scheduling When applying FS scheduling to the E-UTRAN uplink, it is also important to use a technical solution with reasonable complexity to handle inter-cell interference. Due to the limitation of channel estimation accuracy and in some cases (for example, when the user is moving at high speed and/or when transmitting real-time services such as VoIP (Voice over Internet Protocol), FS scheduling becomes unrealistic for E-UTRAN.
  • VoIP Voice over Internet Protocol
  • the FH (Frequency Hopping) scheme is an alternative when FS scheduling cannot be used in the above case.
  • the FH technique can obtain frequency diversity gain in a channel having frequency selective characteristics.
  • UE User Equipment
  • FH Frequency Division Multiple Access
  • Figure 1 shows the normal RU (Resource Unit) allocation for three users UE A, UE B and UE C without using frequency hopping.
  • each UE is allocated one RU with 12 subcarriers in each TTI, and each TTI includes two subframes, which are respectively referred to as a first subframe and a second subframe.
  • the 'first retransmission' refers to the retransmission of the ARQ hybrid automatic request retransmission (Hybrid ARQ). Since the current wireless standardization organization 3GPP proposes to use a fixed non-adaptive retransmission mode, the retransmitted resource location ( Time Interval and frequency) are fixed as shown in Figure 1.
  • Figure 1 (b) shows the case with intra-turn frequency hopping.
  • the distance between the RU numbers between the first subframe and the second subframe in the same frame is defined as the frequency hopping distance D th .
  • the frequency hopping mode is a decisive factor affecting the interference performance.
  • a resource indicator is allocated to each UE as a pair of first subframe index and second subframe index, ⁇ firstldx, Secondldx).
  • the following formula can be used to ⁇ ' ⁇ Secondldx -:
  • Secondldx - od(firstIdx + ⁇ , total_RU_numb e ) ( 1 ) Using the constant frequency hopping distance mode, when the UE is in the same sector and has the same frequency hopping distance, the following formula can be used to calculate the frequency hopping distance.
  • the parameter STEP in the formula (2) is the basic frequency hopping distance, and one value is used for the entire system.
  • Ce //jiic is the index number of the sector.
  • Figure 2 illustrates the frequency hopping mode using the same distance. Therefore, the resource pair to which the UE is allocated is ⁇ 1, 3 ⁇ , ⁇ 2, 4 ⁇ , ⁇ 3, 5 ⁇ where Djh is 2.
  • the constant frequency hopping distance causes each UE in the same cell to use the same frequency hopping distance, thereby failing to randomize interference between cells.
  • the present invention proposes a random frequency hopping mode in which a variable hopping length is provided between UEs of the same cell. Therefore, interference between cells can be randomized, thereby maintaining the stability of interference.
  • a mobile user resource allocation method including the steps of: a base station randomly generating a resource allocation mapping sequence based on a frequency hopping scheme;
  • the base station allocates communication resources to each user equipment in the cell according to the generated resource allocation mapping sequence, wherein the frequency hopping distance in the frequency hopping scheme is variable.
  • a mobile communication resource allocation scheduler including: An allocation mapping sequence generator, configured to randomly generate a resource allocation mapping sequence based on a frequency hopping scheme; a resource allocator, configured to allocate communication resources to each user equipment in the cell according to the allocation mapping sequence generated by the resource allocation mapping sequence generator
  • the resource allocation mapping sequence generator includes a frequency hopping distance generating module, configured to generate a variable frequency hopping distance.
  • the resource allocation scheme of the present invention can randomize the process of resource allocation between different cells, thereby randomizing interference between cells. Reduce drastic changes in interference due to user movement.
  • Figure 1 (a) shows a schematic diagram of the prior art that does not use a frequency hopping scheme for resource allocation
  • Figure 1 (b) shows a frequency hopping scheme in which the technique is used to determine the distance between the pages of the fetch page. Intentional resources are divided into 3 ⁇ 4 intentions;
  • FIG. 2 shows a schematic diagram of a frequency hopping scheme for allocating resources to a UE using a constant frequency hopping distance
  • FIG. 3 shows a schematic diagram of allocating resources to a UE using a variable frequency hopping distance according to the present invention
  • FIG. 4 shows according to the present invention.
  • Figure 5 shows a block diagram of a resource allocation scheduler in accordance with the present invention
  • Figure 6 shows a schematic diagram of a frequency hopping mapping relationship with variable frequency hopping distances generated in accordance with the present invention. detailed description
  • the present invention proposes a mobile user resource allocation scheme in which UEs in the same cell use different frequency hopping distances.
  • a resource allocation method according to a preferred embodiment of the present invention will be described below with reference to Figs.
  • the Node B In the case where the channel information is unknown, first, the Node B generates a mapping relationship sequence according to the mapping relation sequence generating method proposed by the present invention. Then, resource elements are allocated to respective UEs in its cell according to the generated mapping relationship sequence.
  • the resource allocation scheduler 10 includes a mapping sequence generator 11 and a resource allocator 12.
  • the mapping sequence generator 11 uses the mapping relationship sequence generating method according to the present invention.
  • the mapping sequence generator 11 includes a frequency hopping distance generating module 11A for randomly generating a varying frequency hopping distance, and a mapping sequence generating module 11B for generating a mapping sequence using the generated frequency hopping distance while removing non-conformity The mapping of conditions.
  • the process will be described in detail below.
  • a resource indicator is allocated to each UE as a pair of first subframe index and second subframe index, ⁇ flrstldx, Secondldx).
  • Secondldx can be calculated by the following formula:
  • Secondldx mod ⁇ firstIdx + ⁇ , , total_RU_number (1) According to the present invention, the frequency hopping distance 3 ⁇ 43 ⁇ 4 in the above formula (1) becomes:
  • RandomVal is determined by the mapping mode. Since the mapping mode is generated by a random sequence, the difference of the 'resource pair' at the first subframe and the second subframe is a random variable.
  • Figure 3 shows a mapping pattern generated by means of a random sequence using the method of the present invention.
  • the resulting resource pairs are ⁇ 1, 3 ⁇ , ⁇ 2, 12 ⁇ , ⁇ 3, 1 ⁇ , ⁇ 5, 10 ⁇ ...
  • These resource pairs are allocated to the UEs in the cell by the scheduling algorithm, and the frequency hopping distances of the respective resource pairs are respectively, 2, 10, 1, 2, 5, .... Therefore the value of the frequency hopping distance DJH is a random variable.
  • the subframe or subframe group in s lst has one and only one subframe or subframe group in s 2nd . That is, the subframe or subframe group in s lst is in one-to-one correspondence with the subframe or subframe group in s 2nd .
  • mapping relationship is generated according to the above criteria.
  • Fig. 6 an available mapping relationship random sequence is shown as an example in which a mapping sequence that does not conform to the above criteria is removed.
  • mapping relationship criterion 10 pairs of mapping relationship sequences can be generated, each cell is assigned a pair of mapping relationship sequences, and non-adjacent cells can reuse the same mapping relationship.
  • Each base station allocates RU resources to each user in the cell controlled by the base station according to the mapping relationship sequence of the current cell. That is, each user is randomly assigned a resource pair. Assuming that the mapping relationship of the cell allocation is as shown in FIG. 3, the resources allocated by each user in the cell are respectively, ⁇ 1, 3 ⁇ ,
  • the variance of the interval interference can be reduced.
  • Table 1 shows the variance and mean of the interference for the TU (typical urban typical urban channel model) at 30 km/h.
  • the randomized mapping mode provides better variance performance. Therefore, compared to the method that does not use frequency hopping, the randomized frequency hopping mode can reduce the variance of the interference and obtain a gain of 50%. At the same time, compared with the scheme using constant distance frequency hopping, it can also get 39% increase.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

移动用户资源分配方法及使用该策略的资源分配调度器
技术领域
本发明涉及移动通信领域， 更具体地， 涉及一种移动用户资源分配方法以及 一种资源分配调度器。 背景技术
在 E-UTRAN系统中， 基于信道条件的频率选择性（FS)调度是分布式动态 无线资源管理中的主要技术之一。 然而， 在不能得知瞬时小区间干扰的情况下， 导致无线-信道 SIR ( Signal Interference-Ratio ) ^^大的范围内产生波动， 从而损 害无线链路适配技术的实现。
此外， 为了实现合理的小区边缘性能和保障小区内用户之间较好的公平性， 在小区间存在严重干扰的情况下， FS 调度还必须将更多带宽分配给小区边缘的 用户。 这导致频谱效率降低， 由此导致整个小区性能的下降。
在将 FS调度应用于 E-UTRAN上行链路时， 利用具有合理复杂度的技术方 案来处理小区间干扰也是非常重要的。 由于信道估计精确度的限制以及某些情况 (例如当用户处于高速移动和 /或当传输实时业务，例如 VoIP (Voice over Internet Protocol) 时， FS调度应用于 E-UTRAN变得不现实。
因此， 在 FS调度不能用于上述情况时， FH (Frequency Hopping) 方案是一 种备选方案。 FH技术可在具有频率选择性特性的信道中获得频率分集增益。
在 FH方案中， 根据预先设定的模式为 UE (User Equipment) 分配不连续的 频率资源。 通过利用 FH， 能够减小无线通信中的多路径干扰并避免深度衰落。 因此， 能够在链路层实现频率分集增益。
图 1 (a)示出了对于三个用户 UE A、 UE B和 UE C在不使用跳频情况下的 正常 RU (Resource Unit)分配。 如图所示， 每一个 UE在每一 TTI被分配有具有 12个子载波的一个 RU, 每一个 TTI包含两个子帧， 分别将其称作第一子帧和第 二子帧。在没有跳频的情况下， 第一子帧和第二子帧使用相同的频带。其中'第一 重传'是指 ARQ混合自动请求重发（Hybrid ARQ)的重传， 由于在目前无线标准 化组织 3GPP建议使用固定非自适应的重传模式， 因此， 其重传的资源位置 （时 间和频率） 是固定的， 如图 1中所示。
图 1 (b) 示出了具有 ΤΉ内跳频的情况。 这里， 将相同 ΤΉ中第一子帧和 第二子帧之间 RU编号之间的距离定义为跳频距离 Dth。 跳频模式是影响干扰性 能的决定性因素。
目前， FH模式的设计方案通常没有考虑到系统层性能， 现有技术使用了恒 定跳频距离。 下面将参考图 2来描述现有技术的跳频方案。
如图 2所示， 将第一子帧的索引集合定义为 Slst={ ? /«¾ | 1, 2 , 3, 4, ....}， 集 合的单元为子帧索引。 第二子帧的索引集合定义为 S2nd= { Secondldx \ 1,2, 3， 4,....}。当应用跳频方案时， 向每一个 UE分配资源指示符， 作为一对第一子帧索 引和第二子帧索引， {firstldx, Secondldx) . 根据 FH模式， 可以利用以下公式来 ^'^ Secondldx-:
Secondldx - od(firstIdx +Ώβ , total一 RU— numb e ) ( 1 ) 利用恒定跳频距离模式， 当 UE处于相同扇区时， 具有相同的跳频距离， 则 可以利用以下公式来计算跳频距离
Djh =STEP *(ceU_idx+ 1 ) (2)
其中，公式 (2)中的参数 STEP是基本跳频距离，对于整个系统使用一个值。 Ce//jiic 是扇区的索引号。 图 2演示了利用相同距离的跳频模式。 因此， UE被分配的资 源对为 {1, 3}、 {2，4}、 {3, 5} 这里 Djh是 2。
恒定跳频距离导致处于相同小区的每一个 UE使用相同的跳频距离，由此不 能将小区间的干扰随机化。 发明内容
为解决上述问题， 本发明提出了一种随机跳频模式， 其中在相同小区的 UE 之间提供可变跳频长度。 因此， 能够将小区间的干扰随机化， 从而保持干扰的平 稳性。
根据本发明的一方面， 提出了一种移动用户资源分配方法， 包括步骤： 基站 随机产生基于跳频方案的资源分配映射序列；
基站根据所产生资源分配映射序列， 向其小区内的每一个用户设备分配通信 资源， 其中， 所述跳频方案中的跳频距离是可变的。
根据本发明的另一方面， 提出了一种移动通信资源分配调度器， 包括： 资源 分配映射序列产生器， 用于基于跳频方案随机产生资源分配映射序列； 资源分配 器， 用于根据由资源分配映射序列产生器产生的分配映射序列， 向小区内的每一 个用户设备分配通信资源， 其中， 所述资源分配映射序列产生器包括跳频距离产 生模块， 用于产生可变的跳频距离。
由于跳频方案为通过随机方式产生， 因此本发明的资源分配方案可随机化不 同小区间的资源分配的过程， 从而随机化小区间的干扰。 降低由于用户移动引起 的干扰剧烈变化。 附图说明
图 1 (a) 示出了现有技术未使用跳频方案来进行资獰分配的示意图； 图 1 (b)示出了 3见有技术使 -用管定跳歩页距离的跳频方案来进疔资源分 ¾的 意图；
图 2示出了使用恒定跳频距离向 UE分配资源的跳频方案的示意图； 图 3示出了根据本发明利用可变跳频距离向 UE分配资源的示意图； 图 4示出了根据本发明的资源分配方法的流程图；
图 5示出了根据本发明的资源分配调度器的方框图；
图 6示出了根据本发明产生的具有可变跳频距离的跳频映射关系的示意图。 具体实施方式
为了实现跳频的随机化， 本发明提出了一种移动用户资源分配方案， 其中处 于相同小区中的 UE使用不同的跳频距离。 下面将参考图 3到 5来描述根据本发 明优选实施例的资源分配方法。
首先， 如图 4所示， 在信道信息未知的情况下， 首先， Node B根据本发明提 出的映射关系序列产生方法来产生映射关系序列。 然后， 根据所产生的映射关系 序列来向其小区内的各个 UE分配资源单元。
如图 5所示， 根据本发明的资源分配调度器 10包括映射序列产生器 11和资 源分配器 12。 其中映射序列产生器 11使用了根据本发明的映射关系序列产生方 法。 映射序列产生器 11包括跳频距离产生模块 11A， 用于随机地产生变化的跳 频距离； 以及映射序列产生模块 11B， 用于利用所产生的跳频距离来生成映射序 列， 同时去除不符合特定条件的映射。 下面将对该过程进行详细描述。 与现有技术相似， 第一子帧的索引集合定义为 Sls = flrstldx | 1, 2 , 35 4, ....}， 集合的单元为子帧索引。 第二子帧的索引集合定义为 S2nd= { Secondldx ] 1,2, 3， 4,....}。当应用跳频方案时， 向每一个 UE分配资源指示符， 作为一对第一子帧索 引和第二子帧索引， {flrstldx, Secondldx) . 根据 FH模式， 可以利用以下公式来 计算 Secondldx:
Secondldx = mod{firstIdx +ΰβ, , total—RU—number ( 1 ) 根据本发明， 上述公式 （1 ) 中的跳频距离 ¾¾ 变为:
Djh - Random Val.
这里， RandomVal由映射模式决定， 由于.映射模式通过隨机序列的方式产生， 因此第一子帧和第二子帧枸處的'资源对的差值是一个随机变量。
图 3所示是利用本发明的方法， 通过随机序列的方式产生的映射模式。 其构 成的资源对为 {1, 3}、 {2, 12}、 {3, 1}、 {5, 10} ......。 这些资源对由调度算法分 配给小区中的 UE， 各个资源对的跳频距离分别为， 2、 10、 一 2、 5......。 因此该 跳频距离 DJH的值是一个随机变量。
为了产生随机化 FH, 需要满足下面的准则：
1 ) slst 中的子帧或子帧组有且仅有 s2nd 中的一个子帧或子帧组。 即， slst 中 的子帧或子帧组与 s2nd 中的子帧或子帧组一一对应。
2) 在相邻小区之间避免 RU重叠。 gp， 在相邻小区中， 将相同的/? rw/ 映 射到不同的 Secondldx。
根据上述准则来产生映射关系。 在图 6中， 作为示例示出了可用的映射关系 随机序列， 其中去除了不符合上述准则的映射序列。
这里， 假设在整个带宽中具有 10个 RU。 根据映射关系准则， 可以产生 10 对映射关系序列， 每一个小区分配一对映射关系序列， 并且不相邻的小区可以复 用相同的映射关系。 每个基站根据本小区的映射关系序列， 为本基站控制的小区 内的每个用户分配 RU资源。 即为每个用户随机分配一个资源对， 假设该小区分 配的映射关系如图 3所示， 那么本小区内的各个用户分配的资源分别为， {1, 3}、
{2, 12}、 {3, 1 }、 {5, 10} 。
利用本发明的映射方法， 能够减小区间干扰的方差。 下文将给出 IoT ( Interference over thermal) 的数值仿真结果。 表 1中给出了 TU (typical urban典型城市信道模型） 30公里 /小时情况下干 扰的方差和均值。 从表中可以看出， 随机化映射模式提供了较好的方差性能。 因 此， 与不使用跳频的方法相比较， 随机化的跳频模式能够减小干扰的方差， 获得 50% 的增益。 同时， 与使用恒定距离跳频的方案相比较， 也能够得到 39%的增 、
rm. 0 表 1 TU (typical urban典型城市信道模型） 30公里 /小时情况下干扰的方差和 均值
跳频模式 方差 （dB) 均值 (dBm) w/o FH的增益 无跳频： 20:糊 8902622 ■88T24390353T4 - 固定跳频距离且 15.6621218912 -88.33115614 24.7% 基本步长 1
固定跳频距离且 15.4698038957 88.4035380568 25.63% 基本步长 3
可变跳频距离且 9.39370874548 89.2119570647 54.84% 跳频距离可变

Claims

权 利 要 求
1 . 一种移动通信中基站为移动用户分配资源的方法， 包括如下的步骤： 基站配置通过随机策略产生的基于跳频方案的资源分配映射序列； 基站基于所产生配置的资源分配映射序列， 为其小区内的每一个用户设备分 配通信资源，
其中， 所述跳频方案中的跳频距离是可变的。
2. 根据权利要求 1所述的方法， 其中所述资源分配映射序列包括第一子帧索 引和第二子帧索引， 并且通过第一子帧索引和所述跳频距离来得到第二子帧索 引。
3. 根据权利要求 2所述的方法， 其中随机产生所述跳频距离， 以便以下：
1 ) 所产生的第一子帧序列与第二子帧序列一一对应； 以及
2)对于相邻小区的映射序列，相同的第一子帧索引被映射到不同的第二子帧 索引。
4. 一种移动通信资源分配调度器， 包括：
资源分配映射序列产生器， 用于基于跳频方案随机产生资源分配映射序列； 资源分配器， 用于根据由资源分配映射序列产生器产生的分配映射序列， 为 小区内的每一个用户设备分配通信资源，
其中， 所述资源分配映射序列产生器包括跳频距离产生模块， 用于产生可变 的跳频距离。
5. 根据权利要求 4所述的调度器， 其中所述资源分配映射序列产生器被配置 成产生包括第一子帧索引和第二子帧索引的资源分配映射序列， 并且通过第一子 帧索引和所述跳频距离来得到第二子帧索引。
6. 根据权利要求 5所述的调度器， 其中所述跳频距离产生模块被配置成随机 产生所述跳频距离， 以便：
所产生的第一子帧索引与第二子帧索引一一对应； 以及
对于分配给相邻小区的映射序列， 相同的第一子帧索引被映射到不同到第二 子帧索引。
PCT/CN2007/002402 2007-08-10 2007-08-10 Method for allocating resource of mobile user and resource allocating dispatcher using such policy WO2009021348A1 (en)

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JP2010520394A JP5539200B2 (ja) 2007-08-10 2007-08-10 モバイル・ユーザ・リソース割当て方法およびそれを使用したリソース割当てスケジューラ
CN200780053785.7A CN101743773B (zh) 2007-08-10 2007-08-10 移动用户资源分配方法及使用该策略的资源分配调度器
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