Comments on 802.21 Requirements document

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Comments on 802.21 Draft Technical Requirements (Doc. 21-04-0087-05-0000)

1. Section 1.2 - add text '802.21 should facilitate upper layer mobility management'

2. Section 1.2 - information passing between mobile stations and base stations must be secure, however encryption should not be part of 802.21

3. Section 2.1 - add text "While use cases for handover should allow a wide applicability of the 802.21 standard, the particular examples of WLAN-cellular interworking scenarios 4 and 5 as specified by 3GPP should be facilitated"

4. Section 3.4 - need clear definitions of network discovery, detection and attachment

5. Sections 3.8, 3.9 and 3.10 - propose to sollicite reasoning behind the need for these sections

3.8 Cost

Define what is meant by Cost. Is it cost of the end product (out of scope) or cost of implementation or execution time overhead (in terms of bandwidth, computation time etc.).

Include additional text clarifying the purpose of this section or delete it.

3.9 Link Utilization

Too vague a requirement without an explanation. Include additional text clarifying what is intended. Is the purpose to maximize link utilization subject to some constraints (that are yet unspecified). Since there are multiple access networks, should all of them bemaximally utilized or some. If so, which ones?

3.10 User Experience

Too vague. Include additional text clarifying the purpose of this section or delete it.

6. Section 3.12 - While it is reasonable to mention the need for handover policy in an overall system implementation, the policy implementation function itself is outside the scope of 802.21

7. Section 5 the standard shall not preclude any type of cohesion or coupling between different networks as required by higher layer services

8. Section 7.1 should be removed since it is improper to reference some submissions and not others

9. The proposal to split the requirements document into three parts is a good one and should help the standardization process by breaking the overall task down into substeps