Contextual Filters On Block of News Items
Whenever you need to pass a parameter into a View, one should immediately think "Contextual Filter" - in this case, one should exist for field_channel_section. Note that blocks don't pass their parameters along the URL by default (as with pages), so you will need to set a default value for the filter criterion based on the URL yourself. Thankfully, this can be done by supplying the default value using PHP in the Contextual Filter settings. The particulars depend on what type of field field_channel_section is. If you could clarify, I'd be happy to do the same.